SERVICES
POM Injection Molding
Gears, bushings and snap-fits in POM (acetal / Delrin M90) replace machined metal at a fraction of the cost — and we mold them on our automated presses. Functional, structural and aesthetic parts, from low-volume bridge production to high-volume runs, DFM-reviewed before a cavity is cut.
THE REAL DECISION
Small-Batch Sourcing, Done Right vs. Done Wrong
Low-volume buyers usually hit one of two paths. The wrong one costs months and doubles the budget; the right one gets real production parts in your hand in weeks. Here is what separates them.
Formaldehyde release at overheated melt
Push POM past roughly 220 °C and the acetal chain begins decomposing, releasing formaldehyde gas that burns, streaks the cavity and embrittles the part. Overheating also brings splay, odor and tool corrosion that compound across a run.
Dimensional instability from 1.5–2.5 % shrinkage
Crystalline POM shrinks far more than amorphous plastics — and unevenly when cooling is unbalanced, so warp, sink and out-of-tolerance gear geometry appear after the mold is already cut. Without cavity compensation and cooling balance, tolerance claims fail at first article.
WHAT WE OFFER
The Route That Fits Your Order
POM Processing Parameters We Control
Shrinkage window (1.5–2.5 %) and process ranges per published POM datasheets — verified on our automated presses with managed tooling.
| Parameter | Recommended Range | Why It Matters |
|---|---|---|
| Barrel temperature | 190–220 °C | Full plasticization without thermal degradation of the acetal chain. |
| Mold temperature | 80–100 °C | Hot molds improve surface and dimensional consistency of crystalline POM. |
| Mold shrinkage | 1.5–2.5 % | Higher than most engineering plastics — cavity sizing and gate design compensate. |
| Drying | 80–90 °C, 2–4 h | Not hygroscopic, but surface moisture must be removed for clean surfaces. |
| Gate & runner | Short, generous gates preferred | POM solidifies fast — generous gates keep hold pressure effective. |
| Venting | Short, wide vents | Processing gases must escape the cavity to prevent burning. |
| Ejection & draft | 0.5–1° draft minimum | Rigid POM needs draft to release cleanly without scuffing. |
POM Grades We Mold
Homopolymer, copolymer and modified POM grades we mold on our floor — with Delrin M90 homopolymer as the workhorse for gears and precision parts.
POM vs Nylon (PA66) for Moving Parts
The two classic engineering thermoplastics for gears and wear parts — decide on moisture, dimension and friction behavior.
Where POM Injection Molding Pays
Automotive & EV
Door lock mechanisms, window lift gears and sliders, seat belt components, power steering parts and suspension bushings.
Machinery
Gears and sprockets, conveyor components, valve bodies, rollers, precision screws and nuts, sliding and guiding elements.
Electrical & electronics
Switch components, coil bobbins, light sockets, relay cases, cable clips and wire-harness parts.
Precision instruments
Optical lens mounts, analytical instrument components, surgical instruments, sealing rings and camera gears.
Consumer goods
Pen barrels and caps, zippers, toys, mascara wands and fire hydrant components in corrosion-resistant POM.
Fluid handling
Pump impellers, valve seats and fittings that hold tolerance in water and fuel contact.
Fasteners
Precision screws, nuts and inserts molded in one piece with bosses.
Office & furniture
Chair mechanisms, drawer slides and height-adjuster gears that flex and slide for years.
POM: The Plastic That Replaces Metal
POM (acetal / Delrin) is the closest plastic to metal for gears and moving parts — metal-like stiffness, self-lubrication and fatigue resistance in one resin.
High rigidity and strength — metal-like stiffness in thin sections, ideal for gears, cams and levers.
Self-lubricating with low friction — runs dry against steel and other plastics with minimal wear.
Excellent fatigue resistance — survives repeated bending and impact in clips, springs and latches.
Good wear resistance and dimensional stability — holds defect rates under 1 % in mass production.
Thermal stability — keeps properties across automotive temperature ranges.
Modified variants extend it further — toughened, wear-resistant (PTFE/oil-filled) and UV-protected grades.
Excellent spring-back — POM acts like a spring in clips and snap-fits, returning to shape after repeated deflection.
Dimensional stability — low moisture uptake keeps tolerances stable in humid environments.
Creep resistance — keeps clamp forces and preload in fasteners and press-fits over time.
Low noise — POM gears run quieter than metal in motors and actuators.
Metal-replacement economics — POM costs far less than machined brass or steel for high-volume gears.
FAQ
POM Injection Molding — FAQ
Can you help with product development?
Yes. From design review and material selection to prototyping, tooling and mass production — our engineers support you through the entire product lifecycle.
Do you ship internationally?
Yes. We ship worldwide via air and sea freight, with export packing, documentation and delivery tracking handled by our team.
What quality inspections do you perform?
First article inspection, dimensional measurement, material verification and surface checks — with inspection reports provided per batch. Full details are agreed before production.
What is the difference between rapid and production tooling?
Rapid tooling uses softer materials and simplified construction for fast, low-cost validation runs (hundreds to low thousands of parts). Production tooling uses hardened steel for high-volume, long-life programs.
How long does injection mold making take?
Rapid tooling prototypes can be ready in days; production tooling typically takes several weeks depending on complexity, cavity count and steel grade. We confirm a detailed schedule with your quotation.
Do you provide DFM feedback?
Yes. Every quotation includes a design-for-manufacturing review: draft angles, wall thickness, gate and weld-line locations, tolerance recommendations and cost-saving suggestions — before any tooling is cut.
What file formats do you accept?
We accept STEP, IGES, STL, X_T and 2D drawings (PDF or DWG). A 3D model lets us quote most accurately; 2D drawings are used to confirm critical tolerances and specifications.
How do I get a quote?
Upload your 3D file (STEP, IGES, STL or X_T) through the quote page, or email it directly. Our engineers review the design, run a DFM check and send you a detailed quotation — usually within one business day.
Ready to Start Your POM Injection Molding?
Factory-direct pricing, ISO-certified quality and rapid lead times. Send your spec and volume, get a quote within 24 hours — DFM review included.