MATERIAL SELECTION

Injection molding material selection: start from real use conditions

Material selection should start from temperature, load, appearance, assembly, chemical exposure, flame-retardant needs and cost target.

Real plastic pellets photo from Wikimedia Commons for injection molding material selection
Real image source: Wikimedia Commons, “Plastic pellets for injection molding”, by Teemeah, licensed CC BY-SA 3.0. Used as a real reference image for plastic pellets and material selection.

Ask the use case before naming a resin

Before naming ABS, PC, PP, PA or POM, clarify where the part is used, what load it carries, whether appearance matters, whether flame retardancy is required, and the target quantity.

Understand common material directions

ABS is often used for appearance and general housings. PC focuses on impact and heat resistance. PP is useful for toughness, light weight and chemical resistance. PA is common for loaded and wear areas but moisture affects size. POM is often used for low-friction mechanisms.

Material affects the mold

Shrinkage, flow, mold temperature, gate design, venting, cooling and ejection are all affected by the resin. A material name alone is not enough for tooling decisions.

How we work with customers

Send drawings, samples or a use scenario. We first review structure and process risk, then suggest material direction, prototyping path and tooling concerns.

References: Protolabs Xometry Plastics Technology MoldMaking Technology
Content is rewritten and summarized from public sources; images are site-owned process illustrations.
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