Plastics Injection Molding Materials

Table of Contents
Selecting the Right Plastic Injection Material
Plastic Injection Material Classification
Commodity thermoplastics
Engineering Thermoplastics
High Temperature Plastics
Specialty Plastics
Thermosetting Materials
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Neway leverages a wide range of plastic materials for injection molding, including engineering grades like ABS, nylon, polycarbonate, acetal, and more. Our material experts will help select the optimal plastic resin to meet your part design, property, processing, and application requirements.

1. Selecting the Right Plastic Injection Material
2. Plastic Injection Material Classification

Selecting the Right Plastic Injection Materials?

Selection of the optimal plastic injection molding material requires evaluating plastic properties like strength, temperature capability, chemical resistance, aesthetics, moldability, and cost. Neway's engineers consider key factors from part design to production volumes and secondary operations to recommend the ideal plastic material for your application.

  • Consider mechanical requirements: Strength, impact resistance, ductility, fatigue life etc. needed for the part's function and end-use.

  • Determine temperature capability: Upper service temperature limits based on application. Heat-resistant plastics like PEEK can handle over 300°C.

  • Assess chemical resistance: The part will be exposed to environmental durability, solvents, or chemicals. Polypropylene offers excellent chemical resistance.

  • Evaluate aesthetic needs: Surface finish, color, translucency, and UV resistance requirements. ABS and PC/ABS can be colored easily.

  • Review secondary processing: Impact on welding, bonding, painting etc. Polyamide is suitable for laser welding.

  • Analyze moldability: Flow properties, shrinkage, warpage etc. that affect mold filling and part quality.

Plastic Injection Material Classification

We classify plastic resins for injection molding into categories like commodity thermoplastics, engineering thermoplastics, high temperature plastics, and more based on polymer type, properties, and performance. This guides material selection for different part requirements.

You can refer to the following categories to select the right injection molding material for your applications:

  • Commodity thermoplastics: Refer to a category of widely used, economical plastic materials that are processed by injection molding and extrusion methods. With Low cost and wide availability, Ease of processing, Recyclability, and Limitations in temperature capability features. Products commonly used in everyday life.

  • Engineering thermoplastics: Like PEEK, nylon, and polycarbonate exhibit superior mechanical and thermal properties versus commodity plastics, making them suitable for more demanding applications in automotive, aerospace, electronics, and industrial components. Their tailored polymer structures impart higher performance.

  • High temperature thermoplastics: Like PEEK, PPS, and polyimide retain their properties at elevated temperatures exceeding 260°C. Their high heat capability makes them ideal for replacing metals in harsh environments like automotive engines, aerospace systems, and industrial equipment.

  • Specialty plastics: Encompass unique, engineered thermoplastic resins tailored for specialized properties and performance like extreme chemical resistance, biocompatibility, high strength-to-weight ratio, controlled friction, or conductivity. Their enhanced capabilities suit demanding applications.

  • Thermosetting plastics: Contain polymer chains cross-linked together, giving them dimensional stability, hardness, and heat resistance. Common thermosets for injection molding include phenolic, epoxy, silicone, and polyurethane resins which are suited for applications requiring precise dimensions, rigidity, and resistance to high temperatures.

Material NumberPropertiesApplications
Commodity thermoplasticsPolystyrene (PS) PS is available in two main forms: crystal clear (GPPS) and impact-resistant (HIPS). It is used in packaging, disposable utensils, CD cases, and household items.
Polypropylene (PP)PP is another cost-effective thermoplastic with high chemical resistance It is suitable for packaging, automotive components, household goods, and medical devices.
Engineering ThermoplasticsPolyamide (PA/Nylon) Nylon is a versatile engineering thermoplastic with excellent mechanical properties, including high tensile strength and wear resistance. It is commonly used in automotive parts, gears, bearings, and electrical connectors.
Polyoxymethylene (POM/Acetal) POM is a low-friction engineering thermoplastic with good mechanical properties It is suitable for applications in gears, bearings, and other precision components.
High Temperature PlasticsPolyether Ether Ketone (PEEK) Resistant to over 300°C, inert. Properties: Retains strength and toughness at high temperatures. It is used in aerospace, automotive, medical, and oil and gas applications.
Polyimide (PI) Withstands over 260°C, low smoke/toxicity. Properties: Superior dielectric properties. It is used in aerospace, electronics, and semiconductor industries.
Polyetherimide (PEI) PEI offers high-temperature resistance and excellent mechanical properties, Amorphous structure, and high heat capability. Properties: Low smoke generation, fire resistant. It suitable for electrical connectors, aerospace components, and automotive parts.
Specialty PlasticsPolyphenylene Sulfide (PPS) Extreme chemical resistance, very stiff. Properties: Dimensional stability in hot water/steam. PPS finds applications in various industrial components like pumps, valves, bearings, and gaskets.
Liquid Crystal Polymers (LCP) High strength, excellent dimensional stability. Properties: Resistance to acids, bases, and hydrocarbons. It is commonly used in electronic connectors and switches.
Polytetrafluoroethylene (PTFE) Lowest coefficient of friction, chemically inert. Properties: Shallow friction surface, non-stick. It is used in applications such as cookware coatings, seals, and gaskets.
Thermosetting MaterialsSilicone rubber Silicone rubber can withstand extremely high and low temperatures without losing its flexibility or mechanical properties. from -60°C to 250°C (-76°F to 482°F). Hydraulic seals, medical implants, baby bottle nipples, and phone cases.
Fluorosilicone It is designed to offer enhanced resistance to fuels, oils, solvents, and other aggressive chemicals, making it suitable for specific applications where traditional silicone rubber may not provide adequate chemical resistance. Oil and gas industry seals, chemical solvent seals, electrical connectors
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