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Custom Molded Products

Custom Molded Products

Plastic and rubber are two significant inventions of human civilizations. You are using them for most of your daily work. The mobile phone you are using has plastic covers. Also, the sole of your shoe is made specifically for your shoe model. Both of these are custom-molded products.

You can generally create custom-molded products in various ways. The type typically varies based on the shape and complexity of the product design. Some of these methods are injection, extrusion, and blow molding.

Let’s say you want to launch a new product in the market. Your products feature a unique look and improved performance. However, when you make them, they will be categorized as custom-molded products.

You can do it by a custom molding company or use your custom mold. In this case, Dong Guan Sincerer Tech offers you a wide range of convenient solutions. The company also provides many assembly services.

However, this article briefly explains custom-molded products. We will mainly focus on two materials: plastic and rubber. This article will give you helpful information to apply to your business. New entrepreneurs can get an idea about this market and know how to make profits.

Plastic Injection Mold

What Are Custom Molded Products?

Custom-molded products are usually made from specific molds. They are not standard or regular molds used to create standard products. Standard means you can get similar shapes or alternatives in other brands. Custom-mold products are always unique and don’t have any replacements.

For example, you may find new toy designs every month or year in a toy market. Do you know how they are made? A toy company first creates the digital design and analyzes whether it can succeed in the market. They conduct a few rapid prototyping until the product meets all the requirements. Later, the company creates custom molds for new designs. Finally, they create the products. In this way, most custom mold products are made.

You may observe similar processes in other industries. Whatever the products are, their main job is to improve the function of the existing ones. Let’s know about some of their benefits.

  1. Custom-molded products are usually unique, so their market demand is very high. You know people always prefer unique things. Custom-mold products also last longer.
  2. Custom-mold products allow you to create various designs. In contrast, standard products remain limited in these areas.
  3. Custom-molded products can improve the performance of previous models. Although the cost will be higher, you will get better customer response.
  4. Custom-mold products ensure a perfect fit in a variety of applications. For example, we sometimes need custom products to ensure a snug fit in manufacturing parts. An excellent example is various rubber gaskets and seals.
  5. Custom molded products also play a vital role in enhancing external beauty.

Popularity of Custom Molded Products in Manufacturing

As you know, custom-molded products offer excellent versatility and suitability for various uses. Because of this, you will notice their popularity in many industries. The plastics and rubber industry is particularly noteworthy in this regard.

Custom-molded products are widely popular in the automotive industry. Dashboards, bumpers, and interior parts are noteworthy plastic parts. Seals, gaskets, and different hoses are among the rubber products. Each plays a significant role in a vehicle’s critical function.

You can also find custom-molded products in household items. Kitchen utensils, storage boxes, water jugs, and dustbins are noteworthy examples. People always like custom designs and features. Therefore, the demand for these products is high in this sector.

The electronics industry also significantly uses custom-molded products. They use plastics more than rubber. Plastic covers, wires, insulators, and small parts are common examples. People need them in their phones, laptops, keyboards, fans, and ACs.

Even in daily commodities, people use a lot of custom plastic designs. For example, luggage, eyeglass frames, and water bottles are typical.

The toy industry is another notable sector. Toys generally come in many styles, and kids love unique things. They try to find their dream in toys. Note that the factory uses a unique mold for each design. Both plastic and rubber toys are popular in this market. As you know, parents always want their kids to know about the newest things. Therefore, the demand for custom designs is very high in this case.

Additionally, custom-molded parts are in high demand in various other fields. Development and new ideas are the main parts of this.

Introducing Custom Molded Plastic Products

“Custom” means the products are unique, with no similar alternatives. “Molded Plastic Products” means these parts are made using plastic molding. Custom-molded plastic products are specially designed to meet unique requirements.

Custom plastic parts can be anything. You can decide their shapes, sizes, textures, or even materials. This ability to customize is valuable in the car, medical, and consumer goods industries.

As seen in the first section, custom plastic parts offer many benefits. However, they cost more than standard items. Usually, making plastic dies adds to the total cost. Also, making unique parts takes a lot of time. It takes longer because you have to create a prototype, test it, and then make the die.

Custom Molded Plastic Products Specific Products
Car components Dashboards, interior trims, Mirror housings, air intake systems, seat frames, steering and wheel parts
Electronic Housings Casings for smartphones, laptops, and any electric gadgets
Medical Equipment Tubes, syringes, catheters, lancets
Packaging Materials Bottles, storage boxes, water tanks
Industrial Parts Fan blades, impellers, plastic fittings, tanks, enclosures
Household items Kitchenware, tools, spice boxes, appliance covers
Toys Action figures, board games, toy cars and vehicles, educational items, sports equipment
Agriculture items Spray container, plastic egg tray, floating aerator

custom molded products

What Are Plastic Dies?

Before learning how to make plastic parts, it is necessary to understand plastic dies. Plastic dies are special tools that give shape to plastic parts. They are usually made of tool steel, a robust and durable metal. Tool steel has many types, but the H13 tool steel is the most common for making plastic dies.

Making plastic dies also needs careful attention. First, engineers design the actual part. Then, they create a prototype of the part. Later, based on the shape of the part, they make the plastic dies. Then, various surface treatments are employed to achieve the highest accuracy. Sincere Tech, in this case, gives a tolerance of up to ±0.01mm. Finally, the plastic dies are tested and moved for the final production.

How to Make Custom Plastic Parts?

Custom-molded plastic parts can be made in various ways, each with a unique purpose. This diversity generally arises from the many forms of plastic products.

Some are hollow, while some are solid. Also, some are profile-shaped, while some are rigid small parts. Therefore, the right way depends on the plastic parts and their design. It typically considers the size, shape, and purpose of the part.

Method #1: Custom Injection Molding

Custom injection molding is the most common plastic parts manufacturing process. The process injects the molten plastic into the dies. When cooled, it gives various plastic shapes. Because of this, the process is termed the plastic injection molding process.

How do you distinguish whether the part is made from injection molding or other types? It is simple. When you hold plastic parts, if you see a parting line, the plastic part is made from injection molding.

Going in-depth, you will find injection molding of three major types. (1) Hydraulic injection molding inserts the molten plastic by hydraulic forces. (2) Electric injection molding inserts the molten plastic by electrically produced forces. (3) Hybrid injection molding uses both technologies.

How Does Custom Plastic Injection Molding Work?

Custom injection molding starts by choosing the suitable material. This method uses many plastic grades, including PC, ABS, PP, PVC, LDPE, and HDPE. The right type typically depends on the application requirements. For example, polycarbonate can work at high temperatures, while ABS is easy to process.

The raw materials are often supplied in pallet form. A pallet is a small and uniform piece. An operator first puts these pallets into the hopper. Then, the hopper automatically passes them to the heating chamber. This chamber melts the pallets and pushes them into the dies using screws. This pushing requires a lot of pressure to ensure the liquid plastic reaches every part of the die.

Once the mold is filled, the cooling phase begins. There are several types of cooling, either air or water cooling. Finally, the operator presses the ejection pin and removes the custom injection molding part from the die. In this way, plastic factories make hundreds and thousands of custom-molded plastic products.

Advantages of Custom Injection Molding
  • The high pressure typically guarantees accurate results.
  • Custom injection molding is the best method for making complex plastic parts.
  • You can typically work with any plastic. But you must be careful with the defects when cooling. Some plastics show shrinkage during solidifying.
  • The die always ensures the consistent quality of the product.
  • It produces almost no waste.
Limitations of Custom Plastic Injection Molding
  • Custom injection molding is suitable for small—to medium-sized components. Larger sizes require larger dies, which can be expensive.
  • Tooling cost is relatively higher.

Method #2: Blow Molding

You can also create custom-molded plastic products by blow molding. As the name suggests, this method blows molten metal into a mold to make it hollow. You can make bottles, tanks, and big containers this way. Because of this, people call this process blow molding.

There are several types of blow molding: extrusion, injection, and stretch blow molding. Blow molding creates all kinds of hollow containers.

Benefits of Blow Custom Plastic Molding
  • This method is ideal for creating hollow parts. The produced custom-molded products are also light.
  • Blow molding is a cost-effective solution for high-volume orders.
  • It also needs less upkeep costs.
Limitations of Blow Custom Plastic Molding
  • This method can only produce hollow parts.
  • Blow molding is only suitable for simple designs.

Method #3: Rotational Molding

Rotational molding is also used to create hollow custom-molded products. Interestingly, people also call it roto-molding. In the factory, first, an operator places the powder plastic in the mold. Then, he continuously rotates and heats the mold. This step is mainly automated. For smaller parts, some workshops may do manual rotation.

Because of heat, the powder plastic melts down. On the other hand, the rotation allows it to reach all the surfaces. The combination of these two factors maintains a uniform distribution of molten plastic.

Benefits of Rotational Molding
  • Ideal for more oversized custom-molded products.
  • Roto molding is ideal for low-volume orders.
  • This method doesn’t produce any waste.
Limitations of Rotational Molding
  • Roto molding is not suitable for smaller hollow plastic parts.
  • This method is less accurate.

Method #4: Compression Molding

Compression molding is also widely used in custom-molded product making. In this method, first, an operator places the pre-heated plastics inside the mold. Then, he closes the other half of the mold. At this stage, the machine heats and compresses the plastic. The plastic gradually melts and forms the desired shape.

After cooling, the operator gently removes the part. This method is ideal for creating many car, aircraft, and machine parts.

Benefits of Compression Molding
  • Compression Molding needs low tooling costs.
  • It is suitable for high-strength products.
  • This method creates long-lasting custom-molded products.
  • Compression molding also produces less waste.
Limitations of Compression Molding
  • This method is not suitable for high-volume orders.
  • It can not produce complex plastic parts.

Introducing Custom Molded Rubber Products

Custom-molded rubber products are unique rubber parts. In general, you won’t find them in the market. They are essential in many fields. People prefer custom-made products to fit unique specifications. You will need them when standard rubber products don’t meet your needs.

The car industry needs special gaskets, seals, and vibration dampening. Planes also depend on rubber to handle high temperatures and pressures. Custom rubber parts are prevalent in many sealing applications. Besides, the toy industry also needs rubber. Therefore, you can realize how huge this market is. You have many opportunities to start your business in it.

Custom-molded products have many benefits, but custom rubber parts have some limitations. The main limitation is the tooling cost. Every rubber product shape has a unique die, and creating dies requires time, effort, and money. Besides, working with complex design might be challenging as well.

OEM contact manufacturer

How to Choose the Right Rubber for Your Project?

Rubber comes in many types and grades. Some typical names are natural rubber, NBR, and neoprene. Each has its unique benefits. Natural rubber is excellent for elasticity. It is cheap and easy to get.

On the other hand, NBR and neoprene work great against chemicals and oils. EPDM is suitable for weather resistance. And silicone can resist high heat.

When picking a suitable rubber material, consider a few things. First, consider the environment where you will use your custom rubber products. Does it involve UV rays, extreme weather, or high temperatures? Then, check the rubber’s features. Third, how often will your rubber item be used? Lastly, look at the prices and see how they fit with what you need for the project.

How to Make Custom Molded Rubber Parts

You can typically create custom-molded rubber parts in various ways. Each method offers a unique way to shape your rubber parts.

Method #1 Rubber Injection Molding

Rubber injection molding is a comparatively fast way to create various custom-molded products. First, an operator inserts the rubber pallets into the hopper. Then, the hopper automatically transfers it to the heating chamber. Inside the heating chamber, the rubber pallets gradually melt into liquid rubber.

Then, the injection chamber pushes this molten rubber into the dies. The pressure must be sufficient to reach every corner of the mold. Once cooled, the custom-molded products are removed. Finally, the operator performs some additional finishing, like cutting extra parts.

Rubber injection molding is ideal for creating complex rubber parts. However, this method can not make hollow tubes or containers. For hollow parts, you can use extrusion methods.

Method #2 Rubber Compression Molding

Rubber compression molding is a more straightforward process. In this method, an operator first places the pre-heated rubber compound inside a mold. Then, he closes the mold. When he starts the machine, it automatically heats the compound and compresses towards the edges. In this way, the hot rubber compound gets the final shape.

Compression molding is typically suitable for making bigger-size parts. However, it is not the best method for making complicated parts. Rubber mats, grommets, and big seals are all common examples. This method is a cost-effective solution.

Method #3 Rubber Transfer Molding

This method, also known as the hybrid method, combines injection and compression molding. To understand the process clearly, you must know what transfer molding looks like.

Typically, a mold consists of two halves: one remains still, and the other moves. In transfer molding, one half contains a chamber called the “pot. ”  If you look closely, you will find small sprues from the “pot” to the mold.

Now, an operator puts a pre-heated rubber compound in the “pot. ” Then a plunger pushes it. The molten rubber travels through sprues and reaches every corner of the mold. So, you can see that both compression and injection methods have been used. Because of this, the technique is called hybrid molding.

The best thing about this method is that you can fill multiple molds simultaneously. When a plunger pushes the rubber compound, it fills all the molds equally. As a result, you can create more custom rubber parts. Therefore, this method is suitable for large-volume orders. Rubber sandals, toys, and seals are made through this method. Since it can produce more products at a time, it reduces manufacturing costs, too.

Frequently Asked Questions

How much does a custom injection mold cost?

A custom injection mold may cost, on average, $1,000 to $5,000. The price typically depends on the complexity, size, and material. Simple molds for small parts are generally less expensive. On the other hand, the oversized mold may cost up to $80,000. The material used in the mold may also affect the total price.

How Profitable Is Injection Molding?

Injection molding can be highly profitable, especially for large quantity orders. Typically, this process takes 2 seconds to 2 minutes to complete one cycle. The time depends on the size and density of the final part. If you take an average of 1 minute for each product, you can complete 60 cycles per hour. Therefore, injection molding can be a profitable business.

What is the strongest plastic mold?

Polycarbonate, or PC, is famous for its high-impact resistance and longevity. It can be used to make the most rigid plastic mold.

Polycarbonate can withstand heavy loads, high heat, and a few chemicals. Because of these properties, PCs are prevalent in making many valuable items. For example, safety helmets, eyewear lenses, and car components are noteworthy.

What is the difference between plastic and rubber injection molding?

The main difference lies in using pressure and temperature during injection molding. Rubber injection molding applies more heat and pressure to the mold cavity. On the other hand, plastic injection molding typically uses less pressure. During cooling, rubber needs constant pressure, while plastic doesn’t.

Why is injection molding better than compression molding?

Injection molding is generally faster than compression molding. It usually takes 2 seconds to 2 minutes per plastic or rubber part.

Compression molding, on the other hand, may take 1 minute to 10 minutes. Faster production leads to more output, which means high efficiency.

Injection moulding

Final Thought

The demand for custom-molded products is very high in the modern world. We love unique things, and they offer tailored solutions for that. Because of this, people widely use them in a variety of applications.

Custom-molded plastic products are custom plastic parts. People need them in household items, electronic gadgets, and car parts. PC, ABS, PVC, and PP are some popular plastic materials.

Custom-molded rubber products are custom rubber parts that we also need daily. Examples are custom-sized seals, gaskets, rubber toys, and household items. Natural rubber, NBR, neoprene, and EPDM are typical in this case.

When making all these, you need high-quality dies. Dong Guan Sincere Tech is giving you that opportunity. We offer a range of services, from mold design to custom die-making. If you have any questions regarding mold design and manufacturing, please get in touch with us.

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Plastic Injection Molding Service

plastic injection mold

Looking for plastic injection molding service?

Contact us to get quote, we are A Custom injection mold maker in China that offers plastic injection molding services.

The excellent quality of our plastic molds and molded parts, coupled with our experience and the performance of our services give us today a high international recognition.  Indeed, the company is specialized in International Business and has customers all over the world. SINCERE TECH has very high standards of quality control and always runs long tests to make sure that our Plastic Injection Molding Service reaches all the expectations of our customers. We believe that the quality of a company and its products are seen through time and this is why we like to build strong long-term partnerships with our customer

What is plastic injection molding process?

Plastic injection molding is a manufacturing process in which melted plastic is injected into a mold and then cooled to form a solid part. The mold is created from a metal or plastic tool (1.2344, H13, NDK80, etc.) and is typically made in two halves that are clamped together. The plastic material is heated in a barrel and then forced into the mold under high pressure where it cools and solidifies into the desired shape. This process is used to produce large quantities of identical parts with high precision and repeatability.

When do you need plastic injection molding service?

You may need plastic injection molding service when you require mass production of plastic parts with consistent quality and high precision. This process is ideal for producing large quantities of the same part, as the mold can be used multiple times to produce identical pieces. Additionally, plastic injection molding is well-suited for producing complex and intricate shapes that would be difficult or impossible to achieve with other manufacturing methods. This process is often used in various industries such as automotive, consumer goods, medical devices, and electronics.

plastic injection molding service

plastic molding services

Benefits of plastic injection molding service

The benefits of plastic injection molding service include:

  1. High volume production: Plastic injection molding is ideal for high volume production of identical parts, as the mold can be used multiple times.
  2. Consistent quality: The process is highly repeatable, which leads to consistent quality of parts produced.
  3. Complex shapes: Plastic injection molding can produce complex and intricate shapes that would be difficult or impossible to achieve with other manufacturing methods.
  4. Material flexibility: A wide variety of plastic materials can be used in the injection molding process, including thermoplastics, thermosets, and elastomers.
  5. Cost-effective: The process is efficient and cost-effective for producing large quantities of parts, as the cost of the mold can be spread over many parts.
  6. Precision: The process can produce parts with high dimensional accuracy and minimal tolerance variation.
  7. Automation: Plastic injection molding machines can be automated for increased productivity and reduced labor costs.

Plastic injection molding is a versatile and reliable manufacturing process that can provide significant benefits for producing large quantities of complex and high-precision plastic parts.

Plastic Injection Molding Service in China


We are the manufacturer of our own moulds (toolmaker or plastic injection tooling) and support the production of Injection molded parts allowing reducing your numbers of suppliers. Our injection machines have clamping forces going from 60 to 1050 Tons (2000 Tons outside). Plastic injection molding is the process of producing parts from thermosetting and thermoplastic materials.

Our qualified teams of Designers, Quality controllers and our Research and Development Department allow us to complete our policy: achieving Customer Satisfaction through Improvement and Innovation. The quality of our products and organization permits us to obtain quality certifications (ISO 9001, ) and be awarded numerous times of “Quality Supplier” from different customers. We integrate constantly new resources into our process in order to anticipate any future need of the plastic injection molds market and we became one of the most innovative companies in the sector. The modernity and the organization of our facilities allow us to adapt very quickly to the customer’s needs.

SINCERE TECH has always the objective to stay one of the innovative leaders of the sector and play an important role in our customer’s development. The firm can now propose a total solution from mould design to the semi-finished product (All in-house). SINCERE TECH is always willing to integrate new processes to the solution proposed by staying aware of new technologies. If a customer has a special requirement, we will do everything to fulfill its needs.

Plastic Materials /Commodities

We are used to working with all the classic and less classic plastic materials except PVC (PP, PE, PC, ABS, PC+ABS, PA 6, PA 6.6, PBT, PMMA, TPU, PC+GF, AS, PTFE, POM, PEHD, PEEK…). Our main suppliers are Sabic, Bayer, and Chimei.
About the steel used for our moulds, for export plastic molds we work only with the best steel suppliers like Assab (Sweden), Buderus (Germany), Daido Steel (Japan) LKM( the biggest one in China). For our standard component suppliers, we work with Hasco and DME.

We are used to working with our suppliers the same way we work with our customers. It means good long-term relationships with high-quality policy.

Complex moulds: SINCERE TECH has a rich experience in difficult plastic mould and parts, complex moulds and is an expert in finding solutions to your issues. SINCERE TECH is a real specialist in difficult tooling. To give a classic example: many design companies create plastic products without thinking about mould construction. Then, when the designs are sent to toolmakers, it can be hard for them to make the exact parts (Difficult design, many sliders, many lifters, double injection with materials non-bonding well together, many details in awkward places…).

Most of the classic toolmakers will accept the parts and say that they are able to do it. And then, they will have problems with the plastic injection mould construction, the lead time will be extended and the quality of the tool will not be as expected. Often, these companies have to contact SINCERE TECH to help them to resolve their problems. If you are not sure about the complexity of your part, be sure about your mould maker’s professionalism. SINCERE TECH works closely with its customers in order to resolve any issues.Plastic Injection Molding Service

Thin Wall injection molding: it permits a precise, very accurate molding of plastics and gives better details to the product. This is the name referring to products with a wall thickness lower than 2mm. Usually, the flow is quick, permits a short cycle time and a cost-saving.

Hot runner mold: the special process of injection of plastics where the plastic is kept hot when going through cavities of the mould while the rest of the mould is getting cold to solidify the plastic part and create the molded part: this permits to save plastic material. This is mainly used for parts with medium or large sizes. We are used to working with all popular companies like Yudo, INCOE, Synventive, Husky, HRS… We also have the technology to make our own hot runner systems if the production of the parts (Molding) is made in-house. This again allows our customers to save costs.

Optical Lens Molding: precision molding for glass plastic. This is the technique to produce transparent plastic molded parts (For example Security cameras parts such as the dome cover or also phone frames).

Gas-assist Injection Molding: the plastic parts are gas-assisted molded which means that gas (Most often is nitrogen) is injected at the final stage of the part creation process. It permits to reduce the cycle time, the product weight, the risk of deformation and also the pressure tons injection needed. Moreover, it makes the part’s structure stronger with a better look.

LED/LCD frame molding: injection of plastics used for example to manufacture television screen monitors, computer back-light modules, GPS frames…

IMD, IMF, IML, IMR Molding: In-mold decoration. The decoration of the part is made inside the mould through a film. The film is printed before the molding with the designs wanted. It permits better productivity and extends the decoration’s lifetime. If the customer wants to change the design/decoration of the part, it is not necessary to make another mould but only to change the film. SINCERE TECH is experienced with In-mould forming, in-mold-labeling, and in-mold by roller.

Overmolding: this technique permits to join several components together with a thermoplastic material. This reduces assembly and labor costs. Because the parts are made together, this allows less risk of improper termination or misalignment and increases the design flexibility. Moreover, thermoplastic provides better resistance to vibration or shocks. This technique permits to increase resistance, reduce costs and weights.

Insert Molding: this is a technique where a small part (Stamping part, optical part…) is added or inserted to the Injection molded part.two shot molding

Two-Shot Molding: 2 independent injection units using 2 different materials and/or colors. The first material is injected; then, the mould rotates and the second material is injected to make 1 part. It permits a 2-colour-molding or also called double injection, 2 shot molding, two-shot injection, overmolding, 2K injection, two colour injection, bi-injection, dual shot molding or multi-component molding.

CNC Technology. CNC is an abbreviation for Computer Numerical Control. This is a machine extremely accurately controlled by computer programs permitting a CAM (Computer-aided Manufacturing) through a CAD (Computer-Aided Design). Any plastic injection tool manufacturer uses it but the value-added of SINCERE TECH is the experience, professionalism, and training of the staff.

FMMS Molding or can be called RHCM (Rapid Heat Cycle Molding): excellence surface appearance: permits to take off the welding line. This process is integrated into the molding to save time. It is used for example for clear plastic parts.

US Welding: Ultrasonic Welding: process to weld/ join/ assemble plastic parts thanks to ultra-sounds.

Silk-Screen Printing:  this is to print logos or designs on parts.

Dip-Coating: this is the process of putting the component inside a liquid solution to apply a thin film on it. It permits to manage, change the hardness, the strength of the part by protecting it and expanding the lifetime of the product. Then, the excess liquid has to be drained and evaporation of the solvent is done to create the thin layer.

Laser Etching: this process is made for cutting a shape, a pattern, an image on the plastic part. It is also called laser graving.

Sputtering coating: this is the process of creating a very thin layer of conducting material on the component. It is also called Plasma Enhanced Chemical Vapor Deposition (PECVD) and can be done with most metals like aluminum, stainless steel, copper…

EMI shielding: protect parts from electromagnetic interferences. It is used to protect electrical signals from the outside world. For instance, we use it with marine radars for Garmin.

Waterproof technology: SINCERE TECH has the experience to make water-resistant parts and is able to ensure in-house tests thanks to the IP68 tests.

Sub-assembly: this is the pre-assembly of a component who will be later on being assembled in a larger product.

R&D: SINCERE TECH has its own Research and Development department in order to work with the customers on their projects, advise them on designs, resolve issues and study the feasibility of those.

Quality Control: We have very high standards of quality control in order to respect any requirements from our customers. We have a 100% quality control on our plastic molded parts, it means we control any part coming out of our production.

At Sincere Tech China mold maker, our unwavering commitment to staying at the forefront of the plastic mold industry drives us to embrace advancements and anticipate future trends. We continuously explore innovative materials and composites that offer enhanced performance and promote sustainability. By investing in ongoing research and development, we consistently deliver cutting-edge solutions that meet the evolving needs of our valued customers. As a trusted injection mold supplier in China, we take pride in our unwavering dedication to excellence.

Aligned with our sustainability goals, we place a high priority on environmentally friendly practices. We actively seek out sustainable alternatives, such as biodegradable polymers, and implement recycling initiatives to minimize the environmental impact of our manufacturing processes. By choosing our custom injection molding services, you can align your brand with sustainable manufacturing practices and contribute to a greener future.

Ensuring quality is our topmost priority, and we maintain rigorous quality control measures throughout the entire manufacturing process. Equipped with state-of-the-art facilities and staffed by skilled technicians, we subject each product to thorough inspection and testing. This guarantees exceptional performance, reliability, and customer satisfaction.

When you choose Sincere Tech as plastic injection molding service partner in China, you can expect the highest level of professionalism, expertise, and innovation. Our dedicated team is committed to helping you bring your ideas to life, delivering superior products that excel in performance, durability, and cost-effectiveness.

Partner with Sincere Tech Mould suppliers for your custom plastic injection molding service, and benefit from our comprehensive capabilities, unwavering commitment to quality and sustainability, and our drive to exceed your expectations at every step of the process. Together, let’s bring your innovative ideas to life.

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Custom Plastic Molding

high volume plastic injection molding

Custom Plastic Molding

Custom Plastic molding is one of the most cost-effective processes for producing large quantities of plastic products. It uses a die or mold in which melted plastic is injected under pressure, cooled, and hardened to produce the final part before being released. This cycle can be repeated very quickly, possibly 1000 times, which distributes the initial cost of the mold over a large number of units, making the cost per part a few dollars or less.

Repeatability and reliability are achieved because a single mold can be used to produce each part. Furthermore, injection molding provides flexibility in terms of a broad range of material options, colors, finishes, and surface treatments that cannot be matched by CNC machining or 3D printing.

Sincere Tech has a highly skilled workforce with years of experience in different sectors, like medical injection molding and LSR molding. New customers are also given a $500 credit on their first mold with Sincere Tech. We have choices for domestic and custom plastic molding company services from a broader prospect.

custom plastic molding

Types of Custom Plastic Molding Techniques

In designing custom molded products and their components, it is critical to choose the correct manufacturing process to obtain a high-quality and durable final plastic product with acceptable costs and production time. Here are the most commonly used techniques of custom plastic molding process;

Thermoforming

Thermoforming involves heating a large sheet of plastic to make it pliable and then forming it over a one-sided mold. The use of vacuum pressure or compressed air to force the thermoplastic closely against the mold to the required shape. The advantages of thermoforming are the low cost of tooling, the short time to market, and the ability to produce large parts such as bathtubs and car dashboards. Also, thermoforming is fast in prototyping and can be customized to a great extent.

Extrusion molding

Extrusion molding is mainly applied to produce long and straight products such as tubes, hoses, or pipes. This method involves the use of pressure to force liquid plastic into a specific shape of a die. Although round shapes are typical, t-shapes, l-shapes, and squares are also possible due to the die’s shape. The advantages of extrusion molding are the low cost of tooling and machinery, little or no need for finishing other than cutting the pieces to the required length, and the possibility of attaining intricate and uniform cross-sectional shapes.

Compression molding

Compression molding is most commonly applied with thermosetting plastics, which, when heated and then cooled, undergo a chemical change to become a rigid solid. In this method, the plastic resin is melted and formed into a putty-like substance and then put into a hot mold. The putty is then compacted by the mold and left to cool. Compression molding is suitable for making plastics that compete with metals, are suitable for rigid lightweight thermosets, and are commonly used in fiberglass reinforced or rubberized plastics.

Blow molding

Blow molding is similar to injection molding, where the plastic is first melted and then injected into the mold. Air is then pumped into the plastic, making it expand and conform to the shape of the mold walls. Blow molding is most suitable for manufacturing items that are thin-walled and have a hollow structure, like water bottles or 2-liter bottles for sodas. This method is fast and is relatively cheaper when large quantities are being produced.

Rotational molding

Rotational molding, or “roto-molding,” is the process of placing a mold into a heated container of liquid polymer and then spinning the mold rapidly. This process covers the plastic uniformly on the walls of the heated metal mold while the interior remains empty. Rotational molding is mainly applied to large, hollow-partitioned containers, storage bins, and even kayaks. The advantages of this method include low setup costs, constant thickness of the walls, and low cost for very small or short runs.

Injection molding

Injection molding is one of the best cost-effective molding technology comparing to rest of above, and this is our mean services, we have offering this service over 18 years, if you have any project that need custom injection molding service, welcome to contact us, and you can go to custom injection molding page to know more about this technology.

The six manufacturing methods of plastics are as follows: By knowing these six manufacturing methods of plastics it will assist manufacturing companies in choosing the best method that will produce the required durability, quality, cost, and efficiency of the products.

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Custom Molding Plastic Materials

Custom plastic mold uses engineered grade custom molded plastics to design intricate patterns or part designs. Some common types include;

ABS, or acrylonitrile butadiene styrene, is a strong plastic that is used in many market goods. A lot of people know this material for how well it resists wear and shock. It is often found in car parts and home items.

ASA stands for acrylonitrile styrene acrylate. It is like ABS, but it is more resistant to UV light, so it can be used outside. It doesn’t fade or wear out quickly. This material is often used in cars and outdoor furniture.

Calcinedioacetate, or CA, is a clear material that can be bent and is used in films and glasses. For uses that come into touch with food, it is safe. It looks shiny and can hold its shape well when pulled apart.

HDPE, which stands for “high-density polyethylene,” is strong for its weight and doesn’t react with chemicals. It’s used for many things, like fuel tanks, food bins, and playground equipment outside. Strong and resistant to the weather.

It has a great mechanical strength even at high temperatures. It is called LCP (liquid crystal polymer). Micromolding and parts with thin walls are both possible. It is used in medical products and electrical connectors.

LDPE, or low-density polyethylene, is a strong material that can be used for many things and doesn’t react with acids, bases, or alcohol. Used in snap lids, trays, and other general-purpose cases. Offers good resistance to force.

PA 6 (polyamide 6, nylon 6) is known for being stiff and strong on a technical level. It resists heat and chemicals well. Used in industry and automotive parts.

PA 6/6, also known as polyamide 6/6 or nylon 6/6, is similar to PA 6 but has better mechanical qualities. Better at keeping heat in. Used a lot in places where there is a lot of stress, like gears and bearings.

Polyarylamide, or PARA, is often backed with glass or mineral fibers to make it hard. You can use it to make structural parts because it doesn’t creep or soak up water. Used for medical and travel purposes.

Polybutylene terephthalate, or PBT, is a type of plastic made from polyester that is used to keep electronics safe. Often used as an alternative to nylon in car parts because it doesn’t wear down as quickly. Offers good stability in terms of size.

Polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) are two materials that work well together to make things stronger and more resistant to chemicals. Used in situations where the ability will be needed for a long time. Seen in the production of car and electronic parts.

PC, or polycarbonate, is a type of polymer that is very light and doesn’t break easily when hit. It is often used in safety gear and glasses. This item has great sharpness and lasts a very long time. Widely used in many fields for tasks that need to be very strong.

PC-ABS, which stands for polycarbonate-acrylonitrile butadiene styrene, is a mix of PC, which is stiff, and ABS, which is flexible. Strong enough for technical tasks that need to be done. Used in the electronics and auto businesses.

PC-PBT (polycarbonate-polybutylene terephthalate, Xenoy): Can’t be damaged by chemicals or lubricants used in the housing of electronics. Offers strength and stiffness. Often used in industrial settings.

PC-PET, which stands for polycarbonate-polyethylene terephthalate, is a material that is strong and resistant to poisons. Strong cleaners and chemicals won’t work on it. utilised in the creation of sporting items and medical gear.

Polycyclohexylenedimethylene terephthalate (PCT): It absorbs water better and is more stable in the environment than PET. It is often used in switches and links. Suitable for applications that need great performance.

PE (polyethylene): It can be shaped very easily and is resistant to chemicals and wear. Used in tubes, films, bottles, and other packaging products. It has different grades, like UHMW, LDPE, and HDPE.

PEEK, which stands for polyether ether ketone, is very strong when pulled apart and doesn’t melt at high temperatures. In high-stress situations, it is sometimes used instead of metal. It is used in medical and aircraft settings.

Polyetherimide, or PEI, is used a lot because it can handle high temperatures and flames. A cheap material that can be used instead of PEEK in medical settings. Offers good stability in terms of size.

Polyethylene-polypropylene, or PE-PP, is a blend made up of polyethylene and polypropylene that has properties of both. Used in a variety of general-purpose situations. Chemical protection is good.

Polyethylene-polystyrene (PE-PS) is a material that has the qualities of both polyethylene and polystyrene. Suitable for a wide range of uses. combines being flexible and stiff.

Plastic called polyethersulfone (PES) is clear, hard, and doesn’t mix with chemicals or heat. It can also be sterilized. Used in the aerospace and food processing equipment businesses. It is often used in situations where great performance is needed in harsh conditions.

PET (polyethylene terephthalate, Rynite): It’s usually tough, clear, and light, and it’s used to make food wrappers and drink bottles. With a plastic code of 1, it can be recycled. It works well as a shield.

PLA, or polylactic acid, is a plastic that is good for the climate, can be recycled, and has a low glass transition temperature. Often used in short-term situations. Compostable and good for the environment.

PMMA, also known as acrylic or polymethyl methacrylate, is a clear plastic that looks like glass and wears well. Great for using outside. For example, in displays, signs, and glass.

Acetal polyoxymethylene, or POM, is a material that doesn’t absorb water and doesn’t stick to things easily. A great choice for precise parts. Used in bearings, gears, and other industrial parts.

Polypropylene (PP): It’s good at conducting electricity and staying stable in chemicals. Low ability to absorb water. It is used in textiles, car parts, and packaging.

Polyphthalamide, or PPA, is a type of nylon that has a relatively higher melting point and a relatively lower ability to absorb water. It can be used in both cars and factories. Useful for devices that distribute fuel and fluids.

Polyphenylene sulphide, or PPS, is a high-tech thermoplastic that is very resistant to acids. Found in the electronics and auto businesses. It’s very resistant to heat.

PS (polystyrene) is clear, stiff, and easy to break. It is often used to make food wrap and single-use items. It doesn’t cost much and is easy to make. Often found in shopping goods.

Noryl is made of PS-PPE, which is polystyrene-polyphenyl ether. It is also very resistant to heat and flame. Good hardness and tensile strength at high temperatures. Used in the auto and electrical businesses.

Polysulfone (PSU) is stylish, hard, and clear. It’s a better choice than polycarbonate and works better. Used in the production of medical gear and tools for moving food. Chemical protection is good.

Polyvinyl chloride (Shore D) or PVC is a hard, mass-produced plastic that is used to make pipes and things that don’t last long, like food wrap. Long-lasting and useful. Used in the automotive and building industries.

PVDF (polyvinylidene fluoride, also known as Kynar): Doesn’t mix with anything and can handle high temperatures. Used to make plumbing parts, electrical insulation, and chemicals. It doesn’t stick to things well and doesn’t last long.

SAN stands for styrene acrylonitrile. It is clear, doesn’t melt in the heat, and is cheap. Kitchen tools, plates, and other things used around the house have it. It makes the gloss and clarity better.

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Elastomeric Injection Molded Materials

Elastomeric parts can also be processed through the injection molding process, transfer molding, and compression molding. Some common types include;

EPDM (ethylene propylene diene monomer rubber): EPDM is widely used due to its high heat and chemical resistance. Some common uses include in automotive seals, gaskets, O-rings, and electrical insulators.

PEBA (polyether block amide): PEBA is soft and flexible and widely used in the construction of medical instruments such as catheters. PEBA foams are used for padding, shoe insoles, and sports equipment because of their moisture and UV resistance.

PVC (polyvinyl chloride, Shore A): PVC is an elastic thermoset that is a resilient material, and is often used in products for outdoor use, protective coatings, and mats. It needs plasticizers to make it flexible and is famous for its flame resistance.

TPE (thermoplastic elastomer): TPEs are a group of elastomers that possess the characteristics of thermosets but with the processing ability of thermoplastics. They encompass a broad spectrum of special elastomer categories.

LSR (liquid silicone rubber): These are used in foods and biomedical applications due to their heat, biocompatibility, and flexibility. LSR is applied in medical devices, automotive, aerospace, and consumer products, and it is processed differently from injection molding.

Custom Plastic Molding Surface Finishing Options

Standard Finish: This finish, usually SPI B-2, is selected by the mold maker depending on the part’s shape and the angles of the parting line. It is often applied to non-aesthetic parts, and the parts are left machined for functionality without extra expense or time.

SPI Finishes: These are the standard surface finishes set by the Society of the Plastics Industry that dictate the feel and look of the molded parts. They assist in meeting certain aesthetic and functional objectives, which makes them suitable for many uses.

MoldTech Finishes: These are specialized texturing processes that put patterns or textures on the mold surface to improve the aesthetic and feel of the finished part. MoldTech finishes are applied to achieve specific looks and enhanced tactile feel or to mimic other materials such as wood or leather.

Other Textures – VDI: VDI textures are available in various forms, with varying degrees of roughness and appearance to meet certain design requirements. They are widely applied in industries where the surface finish is a critical factor in the product’s functionality or aesthetics.

Design Tips For Custom Plastic Molding

Undercuts: Reduce undercuts to make the tool ejection mechanisms easier and to avoid complications in manufacturing. The use of pass-through coring can also help achieve this goal while at the same time not compromising on the costs of production.

Wall Thickness: Ensure that the thickness of the wall is constant so that there will not be problems such as wall sinks and voids during molding. Reduced wall thickness is beneficial in the aspect of cycle time and cost of manufacturing.

Drafts: Make sure that the parts have a minimum draft angle of 0. 5° to 5° especially when molding textured faces, to ensure that the faces eject smoothly and free from molding defects.

Ribs/Gussets: Make the ribs to be 40-60% of the outer wall thickness while ensuring that the draft angles are correct for the structure. In this case, it is possible to achieve an increase in strength while maintaining the moldability of the gussets.

Bosses: Design bosses with a depth of 30% of the thickness of the wall and include a 30% edge recess for optimal performance.

Benefits & Applications of Custom Plastic Molding

Injection Molded Part: The tooling is inexpensive, and the company can produce parts quickly, with delivery in as little as 10 business days at low prices.

Rapid Prototyping: Injection molding is a fast method of prototyping and can be used to test various designs within a short span.

Production Parts: Custom plastic molds are ideal for manufacturing a large number of production parts at high efficiency and low cost.

Range of Industries and Certifications: Injection molding is used in different fields and complies with the necessary standards to meet the needs of specific applications.

Stand Afirm With Sincere Tech For Your Custom Plastic Molding Project

In as much as custom plastic injection molding is concerned, Sincere Tech is one of top 10 plastic injection molding compnies in China. With ISO 9001:We have 2015 and ISO 13485 certifications, and this means that we value quality and precision in all the projects that we undertake. The extensive capabilities make it possible for us to work with many industries and provide high-quality injection-molded components with high precision.

Contact us today to find out more about our state-of-the-art plastic injection molding services. Whether it is prototype or production parts, Sincere Tech is dedicated to providing you with the parts you need in the best quality by offering stringent quality custom molded plastic materials and finishing solutions. So, do not wait to get a quote and become our partner in your next successful injection molding project.

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