Automotive plastic parts and tooling

The barrier in automotive work is documentation, not machinery. A bracket is not hard to mould; what is hard is being identical every batch, with a dimensional report, traceable material lots and a record of every tool change. Plenty of small shops can mould the part and cannot produce that paper, and the audit stops there. We settle the documentation requirement at quoting stage — tell us what level of submission your programme needs and we build the schedule around it, rather than discovering the mismatch the week before delivery.

Our range is small and medium parts: interior brackets, connector housings, clips and small covers. Tooling for these is compact and quick to change, which suits prototyping and a ramp-up in modest volumes. Large exterior body panels — bumpers, fenders — are outside what we do; they need big platens and a painting line, and we neither run them nor quote them.

The certification question comes first, so it goes first here: we are a family-run shop without IATF 16949, and if your programme mandates a certified supplier we are not the right fit. Where it does not, what we can supply is what actually gets used — dimensional inspection reports, material certificates with lot numbers, first-article samples, a process flow diagram, a tooling and gauge list, and a record of every tool change. We cannot issue a proper MSA or a full PFMEA, and we have no in-house laboratory for material property testing; those results come from the resin supplier. Tell us the submission level when you ask for a price and we prepare to it, rather than finding the gap the week before delivery.

Under-hood parts sit at 80–120 °C continuously, where glass-filled PA66 is the standard answer — heat resistant, oil resistant, stiff enough. Closer to the exhaust or hotter still, higher-grade PA or PPS comes in and the cost climbs noticeably. The detail that gets skipped is moisture: PA absorbs water, so the same dimension measured dry-as-moulded and after conditioning are not the same number. Agree up front which one acceptance is measured on, or it becomes an argument at the customer end.

Tool changes fall into three cases and they are priced differently. If we made the error or misread the drawing, the change is free and we carry it. If you are changing the design, it is quoted on the work — small changes usually a couple of thousand RMB over three to five days, larger ones re-evaluated. Normal wear repair is charged by the hour. In every case the proposal and the price reach you before the tool is touched, never after, and a record of the change stays in the file for your traceability.

2 business days · 25–45 days · Dimensional report + material cert · FOB Qingdao · T/T

Automotive plastics — photos from our floor

Part types we actually run

Interior brackets and mounting points

Usually glass-filled PA — anisotropic shrinkage from fibre orientation is what causes warp

Connector bodies and housings

Terminal position matters; inserts should be replaceable individually once they wear

Clips, retainers and grommets

Small and precise — the radius at the cantilever root decides how many fittings it survives

Small covers and trim caps

Cosmetic parts, with texture and colour held to interior trim standards

Structural brackets and reinforcement plates

Load paths need agreeing with you — wall thickness and rib layout set the stiffness

Under-hood covers and shields

Heat and oil resistance drive the resin choice — PA grades, glass-filled where needed

Which material, and why

PA66 + GF — The mainstay for loaded automotive parts: stiff, heat-resistant and oil-resistant. Fibre orientation drives shrinkage, so gate position follows the load direction

PA（尼龙） — Unfilled grades are tough and springy — clips, grommets and anything that has to flex

ABS — Interior cosmetic parts where surface and colour matter and cost has to stay in range

PC-ABS — The step up for interior parts needing heat and impact resistance

POM — Wear parts, gears and slides that need dimensional stability

TPE — Soft-touch parts and seals, overmoulded onto a rigid substrate

Lucas — Lucas@ycmold.top · WhatsApp +86 183 6966 7875 · No.363 Shengli West Street, Weicheng District, Weifang, Shandong, China