Custom overmolding for rigid-soft multi-material components Engineered substrate and overmold pairing for secure bonding Injection Molding Services for prototypes and production transfer Responsive support for Low-volume Manufacturing and scale-up 
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Overmolding is an advanced plastic injection molding technique that combines two thermoplastic materials into one unified component. The first shot forms the rigid substrate, and the second shot adds a softer or more functional outer layer that bonds to the base while cooling.
This approach improves grip, sealing, impact resistance, and user comfort while keeping assemblies compact. It is widely used for automotive controls, medical housings, consumer electronics, and other products that need durable multi-material performance.
As a Plastic Injection Molding Service partner, Zigitech helps teams evaluate substrate-overmold compatibility, manufacturability, and production transfer so overmolded parts move from prototype validation into stable Manufacturing Service execution.
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This method bonds one plastic substrate with a second molded layer to create parts that need controlled feel, better ergonomics, or added sealing features in repeatable production.
A soft elastomer is molded over a plastic base to add grip, surface comfort, vibration damping, and a more secure user interface for handheld or enclosed products.
Plastic is molded around a metal insert or frame when the part needs structural reinforcement, more stable alignment, or fewer downstream assembly steps.
An elastomer layer is molded over metal components to improve sealing, handling, shock absorption, or environmental resistance in demanding product assemblies.
Upload the model to kick off a fast technical review.
See immediate cost guidance plus practical feedback for efficient production.
Sign off on the final requirements before machining or molding begins.
Finished parts move from production control to outbound shipment.
Get fast design feedback and validation with prototype tooling built for functional review, assembly checks, and short-run molded part evaluation before production release.
Zigitech supports prototype molds with steel cavity and core configurations that typically deliver 1,000 to 5,000 shots, with common lead times around two weeks depending on geometry and material selection.
We build durable production molds for repeatable high-volume plastic parts, using tool steel selections and mold construction strategies matched to part complexity, resin behavior, and forecast demand.
For long-running programs, Zigitech develops production tooling intended for stable cycle performance, long service life, and predictable output planning across transfer and scale-up stages.
The base substrate defines geometry, shut-off surfaces, and retention features that support repeatable overmold placement and part stability.
TPE, TPU, silicone, or similar soft-touch materials are applied only to grip, seal, or damping zones that add end-use value.
Gate location, wall balance, venting, and cooling are tuned together to reduce knit lines and support stable adhesion across production runs.
| Standards | Description |
|---|---|
| Maximum Part Size | 200 x 400 x 100 mm 7.87 x 15.75 x 3.94 in. |
| Minimum Part Size | 2 x 2 x 2 mm 0.08 x 0.08 x 0.08 in. |
| Substrate Wall Thickness | 0.5 to 3 mm 0.020 to 0.118 in. |
| Tolerance | +/- 0.025 mm +/- 0.00098 in. |
| Radii | 0.1 mm 0.0039 in. |
| Depth | 100 mm from the parting line 3.94 in. from the parting line |
| Mold Validation | T0, T1, and T2 samples before production |
| Inspection and Certification Options | First Article Inspection, ISO 9001, ISO 13485 |
| Lead Time | Mold making to sample delivery: 15-45 business days |
Overmolding improves part durability and user-facing performance by integrating different materials in one controlled molding workflow. It is especially useful when a product needs better grip, cleaner assembly, and more refined visual finish without adding unnecessary downstream operations.
The injection overmolding process works across plastics, elastomers, and metal inserts, making it suitable for both prototypes and production components in multiple industries. Zigitech applies overmolding where a part needs ergonomic handling, protected interfaces, or stronger material integration.
We ordered aluminum manifolds for a pilot build and were watching the sealing surfaces closely. The parts arrived well packed and checked out cleanly during our incoming inspection.
What stood out was that the quote review connected design choices to production reality. Our team got clear notes on wall thickness, access, and finish instead of vague suggestions.
For a control cabinet program, the hardware insertion and bend details matched the released drawing set without surprises. That saved rework on our assembly side.
We asked for a tooling review before final approval and got specific comments on shutoffs and cosmetic risk. It felt like feedback from people who actually build these parts.
The turned shaft parts were consistent from sample to sample, which mattered because we were checking fit against bearings and seals. That repeatability is hard to fake.
We had one material question mid-order and got a straightforward answer with options, not a delayed sales response. That helped us keep our internal approvals moving.
The prototype covers looked good enough for customer demos but still gave us usable fit information. That balance was exactly what we needed at that stage.
Across a mixed order of parts and jigs, revision control stayed clear all the way through. That made our own internal tracking much easier when the shipment landed.
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