Injection Molding Materials

What material is used in injection moulding？Materials used in injection moulding generally include pla molding, nylon injection molding, polypropylene plastic injection molding, pp injection moulding, pvc injection molding, hdpe injection molding and so on. Injection moulding raw material list is as following.

ABS injection molding: One thermoplastic created by the material of emulsion, with a relatively low melting temperature, and resistant to corrosive chemicals.

Common Application: Enclosures.

Acetal (POM/Delrin): One thermoplastic which is resistant to liquid absorption and chemicals and used to be injection molded.

Common Application: Bearings, bushings, dispensing components.

Acrylic (PMMA molding): One transparent polymer with excellent tensile, bending strength, less cost and comparable properties to polycarbonate.

Common Application: Clear enclosures, light pipes and LED lights.

Polyethylene: It has a low melting point, high impact strenth and low friction.

Common application: Bags, toys and electroinc insulation.

HDPE: One thermoplastic created from petrolum, with high tensile strength, high impact resistance, and a high melting point.

Common applications: Caps and enclosures.

Nylon molding: One plastic material which is resistant to chemicals and stable at high temperatures, with high mechanical strength and rigidity.

Common Application: Plastic injection molding automotive parts, gears, bushings.

Nylon+(0-30%) Glass-Filled: Much stiffer, greater tensile strength than standard Nylon.

Common application: Bearings, washers, a lightweight substitute for metals where appropriate

PEEK injection molding: Resistant to chemical, radiation and high temperature.

Common applications: Medical plastic injection parts, chemical processing, and aerospace parts.

Polycarbonate moulding: Tough, strong and transparent.

Common application: Automotive parts, electronic components, aerospace parts.

PC/ABS: A mixture of ABS and polycarbonate,which means to have the properties of both substrates-heat resistance and flexibility. The mixture is also easier to process during injection molding than any of the substrates.

Common application: Large panels, enclosures.

Polypropylene: It has excellent chemical and electrical resistance at high temperatures.

Common application: Daily uses, plastic cases, medical components.

PPO: It has great electrical properties and dimensional stability.

Common application: Injection molding electronics components

TPE: One thermoplastic can be re-melted, has the appearance and feel of a material similar to rubber. It has excellent thermal performance and stability over a wide temperature range.

Common application: Household appliances, automotive parts.

TPU: TPU overmolding is one elastic material resistant to oil and abrasion.

Common application: Electronic parts and medical parts.

What Type of Plastic Is Used for Injection Moulding ?

Low-density polyethylene is used for injection molding to make bottles, plastic bags, clingfilm and playground slides. The advantage of using this plastic molding material is its moisture resistance and chemical resistance. In injection molding resins, there are two common types of polystyrene: HIPS and GPPS. GPPS are transparent while HIPS are opaque. The hard shell of the toolbox and power tool body is also made of high impact polystyrene.

Injection Molding Materials Selection

Generally speaking, injection molding materials are requested to have good gloss and surface state, and the surface roughness of the cavity is very small, thus the cavity surface must be polished, grinding and other processing. Therefore, the selection of materials used in injection moulding should not contain coarse impurities and pores.

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