What is Injection molding materials for?

Injection molding materials refer to the thermoplastic or thermoset polymers that are used in the process of injection molding to produce parts and components. These materials are melted and then injected into a plastic injection mold, where they cool and solidify into the desired shape.

Some common injection molding materials include polyethylene, polypropylene, ABS, PVC, polycarbonate, nylon, PET, and acrylic. The selection of the appropriate material depends on factors such as the desired properties of the finished product, production cost, and the manufacturing process requirements.

How important of injection molding materials

Injection molding materials play a critical role in the injection molding process as they determine the properties and quality of the final product. The following are the reasons why injection molding materials are important for the injection molding process:

  1. Product Properties: The material used in injection molding affects the final product’s physical and mechanical properties such as strength, stiffness, flexibility, hardness, toughness, and heat resistance.
  2. Processing: The material must have appropriate flow characteristics to ensure proper filling of the mold cavity, as well as good dimensional stability during cooling.
  3. Cost: The material cost is a significant factor in determining the overall cost of the injection molding process. Some materials are more expensive than others, and choosing the right material can help to optimize the cost-effectiveness of the process.
  4. Availability: The availability of the material can impact the lead time for producing the parts, so it’s important to choose a material that is readily available to minimize production delays.
  5. Quality and Consistency: The quality and consistency of the material can have a significant impact on the quality and consistency of the final product. A consistent material can help to ensure consistent part quality, which is important for many applications.

Therefore, the selection of the appropriate material is crucial for the success of the injection molding process, and it is important to carefully consider all the factors involved in choosing the right material for the job.

SINCERE TECH provides hundreds of injection molding materials solutions, with a few proprietary materials engineered right within their facilities. Many material offerings are tied in with a specific technology due to the nature of the manufacturing processes.

Below, the materials (which are often indicated by the technology they are married to) have been categorized into model/ prototype parts and functioning durable parts capable of meeting production requirements. It is best to consult with our Project Engineers if your material requires regimented standards and for further specifications.

injection molding materials

plastic resin material

Fine Feature Detail

  1. PolyJet Standard & PolyJet HD
  2. PolyJet Flex & PolyJet OverMolding
  3. Stereolithography (SLA) & High Definition Stereolithography (HDSL)
  4. ID-Light™

High Temperature

  1. Selective Laser Sintering – PEEK and FR 106 materials
  2. Fused Deposition Modeling – ULTEM
  3. CNC Machining

Functional & Durable

  1. Thermoplastics, Urethanes, Nylon & Nylon Composites, Metals
  2. Selective Laser Sintering (SLS) – Nylon 12 and Nylon 11 Materials
  3. Fused Deposition Modeling (FDM) – ABS and PC-ABS thermoplastics
  4. Additive Metal Manufacturing (AMM), Direct Metal Laser Sintering (DMLS) – Stainless Steel, Inconel, Cobalt Chrome
  5. CNC Machining
  6. QuantumCast™ Advanced Cast Urethanes


  1. Selective Laser Sintering – PEEK and NyTek
  2. Additive Metal Manufacturing (AMM), Direct Metal Laser Sintering (DMLS)
  3. Fused Deposition Modeling – PC-ABS, ULTEM
  4. QuantumCast Advanced Cast Urethanes
  5. Composites
  6. plastic mold manufacturing and Injection Molding

SINCERE TECH is one of the top ten mould suppliers in China, who can work with any production injection molding materials you require. A selection of the most common materials we work with is shown below:

Description Tensile Yield Flexural Strength Flexural Modulus Izod Impact Strength Heat Deflection Density
(0.125 in2) (Notched) Under Load
ABS Common thermoplastic with good impact resistance and toughness. 6,500 psi 11,700 psi 380,000 psi 5.5 ft-lb/in 190°F 0.0379 lb/in3
(45 MPa) (80 MPa) (2,620 MPa) (292 J/m) (88°C) (1.05 g/cc)
Thermoplastic polymer used for a wide number of applications. 4,900 psi 26,100 psi 210,000 psi 0.6 ft-lb/in 219°F 0.0324 lb/in3
(35 MPa) (180 MPa) (1,450 MPa) (32 J/m) (102°C) (0.90 g/cc)
Dimensionally stable thermoplastic with high stiffness and low friction. 10,000 psi 14,000 psi 450,000 psi 1.41 ft-lb/in 216°F 0.0513 lb/in3
(70 MPa) (100 MPa) (3,100 MPa) (75 J/m) (102°C) (1.42 g/cc)
Polycarbonate Thermoplastic material with good temperature resistance and impact strength. 9,000 psi 18,000 psi 340,000 psi 15 ft-lb/in 290°F 0.0434 lb/in3
(62 MPa) (124 MPa) (2,335 MPa) (795 J/m) (143°C) (1.20 g/cc)
Polycarbonate / ABS Blend of PC and ABS that creates strong parts for a variety of applications. 8,000 psi 13,000 psi 370,000 psi 13 ft-lb/in 202°F 0.0415 lb/in3
(55 MPa) (90 MPa) (2,550 MPa) (689 J/m) (94°C) (1.15 g/cc)
PVC PVC is a polymer with good insulation properties, high hardness, and good mechanical properties. 4,500 psi 7,150 psi 275,000 psi 15 ft-lb/in 226°F 0.0487 lb/in3
(31 MPa) (50 MPa) (1,900 MPa) (795 J/m) (108°C) (1.35 g/cc)
Nylon Polymer material that is durable with high elongation and good abrasion resistance. 8,400 psi 9,430 psi 175,000 psi 2.1 ft-lb/in 190°F 0.0411 lb/in3
(58 MPa) (65 MPa) (1,200 MPa) (111 J/m) (88°C) (1.14 g/cc)
Nylon 30% Glass Fiber molding material Polymer with excellent mechanical stiffness and elevated temperature resistance. 18,000 psi 29,000 psi 900,000 psi 2.5 ft-lb/in 380°F 0.0498 lb/in3
(125 MPa) (200 MPa) (6,200 MPa) (133 J/m) (193°C) (1.38 g/cc)
(PMMA) injection molding materials
Material with resistance to breakage often used for transparent applications. 9,400 psi 8,500 psi 250,000 psi 1.0 ft-lb/in 181°F 0.0422 lb/in3
(65 MPa) (58 MPa) (1,725 MPa) (53 J/m) (83°C) (1.17 g/cc)
Styrene Light weight material popular for its high impact strength and toughness. 6,530 psi 9,510 psi 440,000 psi 1.9 ft-lb/in 174°F 0.0379 lb/in3
(45 MPa) (65 MPa) (3,030 MPa) (101 J/m) (79°C) (1.05 g/cc)
Polyether Imide
Thermoplastic with high heat resistance and excellent mechanical properties. 16,000 psi 24,000 psi 510,000 psi 1.0 ft-lb/in 400°F 0.0549 lb/in3
(110 MPa) (165 MPa) (3,500 MPa) (53 J/m) (204°C) (1.27 g/cc)