Injection Molding Car Parts

Car Parts We Produce

One modern vehicle carries hundreds of injection-molded plastic components, each with its own material, tolerance and surface requirements. Our automotive line covers the full spread:

• Interior: dash trims, door panels and handles, bezels, HVAC louvers and soft-touch overmolded grips in ABS, PC/ABS and PP with textured or low-gloss finishes.
• Exterior: spoilers, emblems, mirror housings and grille components with UV-stable materials and paint-ready surfaces.
• Under-hood: brackets, housings and shrouds in heat-stabilized PA6/PA66, PBT and PPS that hold up to engine-bay temperatures.
• Electrical: connector housings, sensor bodies, fuse boxes and cable management with tight dimensional control — many with metal terminals or inserts.

Every program starts with a DFM review that checks class-A surface risks, knit lines, warpage and insert retention before tooling. Molds are designed and built in-house — see the automotive manufacturing page for how the factory is set up for this work.

Materials, Tolerances & Multi-Material Parts

• Interior grades: ABS, PC/ABS, PP, PA6 — with texture, color match and low-gloss options.
• Under-hood grades: PA6/PA66 GF, PBT, PPS, heat-stabilized PC — confirmed against under-hood temperature requirements.
• Elastomers: TPU and TPE overmolds for seals, gaskets and soft-touch interfaces; silicone for high-temperature sealing.
• Tolerances: critical features verified on CMM and vision systems; metal inserts positioned to ±0.02 mm on our vertical presses.
• Multi-material: two-shot and overmolded assemblies molded in-house so mating surfaces and alignment stay controlled.

Material selection is a DFM conversation, not a catalog pick: the same bracket can be PA6-GF30 for cost, PBT for dimensional stability or PPS for continuous heat. Our engineers lay out the options with data before tooling. For a wider view of what we mold across industries, see the automotive industry page.

Quality, PPAP & Traceability

Automotive suppliers are chosen on evidence, not promises. Under IATF 16949 we provide PPAP-style documentation: dimensional reports, material certificates, process parameters and batch traceability compiled per program. First articles are measured against the full drawing before production release, and in-process sampling keeps the run inside the approved window.

For an industry reference point, First Mold publishes an automotive door-handle case holding ±0.1 mm part tolerance with rejection rate capped at 0.8% (firstmold.com) — that is the caliber of data serious buyers request, and the same caliber we provide. Ask for a sample inspection report via the contact page or start with a quote.