SERVICES

Two-Shot Injection Molding

We mold Multi-Material (and compatible grades) for functional, structural and aesthetic parts — from low-volume bridge production to high-volume runs.

WHAT WE OFFER

What We Offer

HOW IT WORKS

From Inquiry to Delivery

First shot: rigid substrate

The substrate resin (ABS, PC, PA66, PP…) is injected into cavity A and cooled just enough to hold its shape. Shot 1 accounts for roughly 60–80% of the part volume and carries the structural loads.

Rotate or index the tool

The core rotates 180° or the platen indexes, carrying the substrate into cavity B. Tool alignment is held to ±0.02 mm on the registered surfaces so the second shot lands exactly on the first.

Second shot: overmold material

TPE, TPU, TPV or a second rigid resin is injected around and onto the substrate. The interface stays hot enough for melt-to-melt fusion — that is where the chemical bond forms.

Bonding, cooling and ejection

The two melts fuse at the interface while mechanical interlocks (undercuts, ribs, texture) add pull-off resistance. Parts eject fully formed — no gluing, no assembly, no fasteners.

Automated inspection

In-process checks and dimensional sampling on our 18+3 Sodick machines keep controlled dimensions in the ±0.02 mm band run after run, with full lot traceability.

CHALLENGES

Challenges This Service Solves

FAQ

Two-Shot 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.

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Related Capabilities

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What Buyers Search

Injection MoldingOvermolding ServiceInsert MoldingLSR MoldingRapid Toolingtwo shot injection molding / 2k molding / multi material molding / double shot

* Keywords from Semrush competitor data — one page per search intent.

Multi-Material (Thermoplastic) Injection Molding Capabilities

Process options selected to match your part geometry, material and annual volume.

In-house Multi-Material process engineering — material selection reviewed against your mechanical and thermal requirements.

Tight-tolerance multi-material molding 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 roof.

Resin Pairs We Mold Together

Bond strength is decided at material selection. We test the pair before cutting steel — the compatible combinations below are the ones we run daily.

PP + TPE / SEBS — soft-touch handles and grips; food- and medical-contact grades available (ISO 10993, FDA 21 CFR)ABS + TPU — consumer electronics housings with shock-absorbing overmolds; RoHS-compliantPC + TPU — clear or tinted substrates with flexible sealing zones for wearables and devicesPA6 / PA66 + TPV — under-hood and industrial parts needing chemical and heat resistancePOM + TPE — precision gears, cams and sliding parts with grippy or damping surfacesPC + LSR — sealed electronics and medical components molded as a two-material partPP + PP (color/color) — two-color cosmetic parts with no bond-strength concern at all

Two-Shot vs Overmolding: Which Process Fits Your Part?

CycleTwo-shot molds both materials in ONE cycle — typically 20–40 s. Overmolding runs two separate cycles (substrate first, second shot later) at roughly 30–60 s total.

ToolingTwo-shot needs a rotating/index tool on a two-color machine — higher tool cost, lower per-part cost at volume. Overmolding uses two conventional tools and any standard press.

BondTwo-shot bonds melt-to-melt while both resins are hot — the strongest and most repeatable bond. Overmolding relies on adhesion plus mechanical interlock with a colder interface.

Assembly costTwo-shot eliminates gluing, welding and snap-fit assembly — competitor benchmarks show assembly cost cuts of up to 40% on converted programs.

Volume fitTwo-shot pays off from mid-volume up (automated cells, one cycle per part). Overmolding is the flexible choice for low volume, quick iterations and very different substrate/overmold volumes.

Where they overlapIf the substrate must be a metal, ceramic or a pre-made component, it is overmolding or insert molding — two-shot is thermoplastic-to-thermoplastic only.

Applications That Pay for Two-Shot Molding

Soft-touch power tool & hand tool grips

Rigid ABS/PA core with TPE grip molded in one cycle — no glue, no rubber sleeves, no assembly line.

Sealing lips & integrated gaskets

Flexible TPE/TPV seal molded directly onto a rigid body for IP-rated enclosures, valves and connectors.

Multi-color consumer products

Two-color buttons, keycaps, toothbrush handles and cosmetic trims with molded-in color contrast — no painting.

Automotive interior & under-hood parts

Damped, soft-feel trims and sealed housings molded under IATF 16949 process control with PPAP support.

Wearables & medical devices

Rigid electronics core plus skin-contact elastomer band or seal in one part — ISO 13485 traceable lots.

Electrical insulation & strain relief

Insulating layer molded over a conductive substrate, with molded-in strain relief at cable exits.