SERVICES
Overmolding Service
An overmold is only as good as the bond at the interface — we engineer it chemically and mechanically, then prove it with pull-off testing before it ships. TPE grips over PP, TPU soft zones over ABS/PC, LSR seals over PC: we pair, tool and run your multi-material part on our floor, with DFM feedback within 24 hours and rapid tools in 7–12 days — from bridge runs to high volume.
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.
The wrong way: a material pair picked from a generic chart
A TPE or TPU chosen because it 'looks soft' rarely bonds to the substrate it lands on. Incompatible pairs separate cleanly at the interface — the overmold peels off under peel testing or in the field, and the part is scrapped after molding instead of caught in design review.
The wrong way: delamination on the line
Even a compatible pair delaminates when the substrate surface cools below its softening point before the second shot lands, or when nothing mechanical helps the bond. Symptom: a clean separation at the bond line — a process problem that no amount of material switching fixes.
WHAT WE OFFER
The Route That Fits Your Order
How the Overmold Bonds to the Substrate
A good overmold bond is engineered at four levels — we control all of them on-site.
Chemical adhesion
Compatible pairs (TPE over PP, TPU over ABS/PC) form a genuine melt bond at the interface. We run material-pair testing — 300+ pairs in our lab reference set — before tooling so the pair is proven, not assumed.
- Compatibility lab testing
- Documented process window
- FDA / ISO 10993 grades
Mechanical interlock
Undercuts, through-holes, ribs and molded texture give the overmold something to grip. Interlock is the safety net that keeps the bond structural even where chemical adhesion is limited.
- Undercut & hole design
- Textured bonding zones
- Pull-off testing
Interface temperature control
The substrate surface must stay above its softening point when the second shot lands. Mold temperature control of ±0.5 °C keeps the interface consistent — the difference between a bond and a delamination.
- ±0.5 °C mold temp control
- Pre-heat scheduling
- Real-time pressure monitoring
Registered positioning
The overmold must land exactly on the substrate every cycle. Our tooling registers substrate-to-cavity positioning within 0.02 mm, so the soft zone sits where the drawing says.
- <0.02 mm registration
- Automated cells
- First-article verification
Overmolding & Multi-Material Injection Molding Capabilities
Process options selected to match your part geometry, material and annual volume.
On-floor overmolding process engineering — material pairing reviewed against your mechanical and thermal requirements.
Tight-tolerance overmolding with automated cells for repeatable quality run after run.
Custom tooling & rapid DFM feedback — shorten lead time from design to first article.
One-stop production: molding, secondary operations and inspection under one quality system.
Where Overmolding Earns Its Keep
Six scenarios where a bonded soft-touch layer beats glue, clips and secondary assembly.
Power tools & garden tools
Rigid housings with shock-absorbing, non-slip TPE grips — overmolded, not glued.
Medical & surgical handles
ABS/PP substrates with skin-safe TPE or LSR overmolds under IATF 16949-level process control traceability.
Consumer electronics
Phone cases, earbuds and controllers with soft corners and IP68 sealing zones.
Automotive interiors
Soft-feel trims and damped knobs with documented process control for IATF 16949 programs.
Baby & personal care
Food-grade TPE overmolds on bottles, teethers and grooming tools — BPA-free, FDA 21 CFR grades.
Industrial handhelds
Rugged housings with vibration-damping grips tested to MIL-STD-810G shock profiles.
FAQ
Overmolding Service — 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 Overmolding Service?
Factory-direct pricing, ISO-certified quality and rapid lead times. Send your spec and volume, get a quote within 24 hours — DFM review included.