SERVICES

Double Shot Injection Molding

Double shot (also called 2-shot or multi-shot) injection molding molds two different materials or colors into one part in a single machine cycle. The result: soft-touch grips, integrated seals and two-color aesthetics that would otherwise require glue, press-fit or a second operation. If your current two-material part is still glued, snapped or overmolded in two cycles, double shot is the process that removes the seam and the assembly labor — upload your 3D file and get the single-cycle DFM.

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.

Secondary-assembly seams

A glued or press-fit two-material part carries a visible seam, a tolerance stack and a failure point — adhesive ages, press-fits loosen and alignment is only as good as the fixture.

Incompatible material pairs

An incompatible resin pair delaminates, weeps or cracks in the field no matter how good the machine is — compatibility is decided at pairing, not on the press.

WHAT WE OFFER

The Route That Fits Your Order

Machine and Tooling Configurations for 2K Molding

Machine classes below are the standard two-shot configurations; the MOLDITQUICK floor row is our own capacity.

Rotary platenMold halves rotate 180° between shots; balanced cycle, highest output — the standard for high volume.

Index plate3+ stations for 2K/3K multi-shot; complex stacking and sequenced shots.

Core-back (shut-off)A sliding core forms the second cavity; simpler tool, longer cycle.

MOLDITQUICK floorAutomated injection presses with dedicated two-shot / multi-material cells; two-color molds delivered through our audited tooling partner network.

Tooling precisionTwo-shot molds are treated as precision molds — tolerance, runner layout and shrinkage compensation engineered per pair.

Cycle-time comparisonOne combined cycle beats two separate molding cycles plus an assembly step — the classic case behind the 40% assembly-cost reduction.

When 2K does not fitVery large parts or incompatible resin pairs force overmolding or insert molding instead.

Typical cycle timeDepends on wall thickness and resin pair; the second shot adds seconds, not a second process.

Best volume for 2KFrom a few thousand parts up — the tool premium pays back as assembly labor disappears.

Material Pairing Compatibility at a Glance

Bond type and fit below are standard two-shot engineering guidance; the final bond is validated by trial.

Resin pair	Bond	Typical use
PP + TPE	Chemical (same family)	Soft-touch handles, automotive
PC + TPU	Mechanical + chemical	Electronics, grips
PA + TPV	Chemical	Seals, connectors
ABS + TPU	Mechanical	Consumer housings
POM + TPE	Mechanical	Gears, sliders
PMMA + TPE	Mechanical	Transparent + soft-touch trim
PP + EPDM/TPV	Chemical	Automotive trim, seals
PC + ABS/TPE	Mechanical	Display frames, edges
PBT + TPE	Mechanical + chemical	Connectors, sensor housings

Where Double Shot Pays Off

Soft-touch grips

Rigid handle + TPE overmold for ergonomic, non-slip comfort in one shot.

Sealing lips

A flexible TPE or TPV seal molded directly onto a rigid structural body.

Multi-color aesthetics

Two contrasting colors in a single part — no paint, no secondary assembly.

Electrical insulation

Insulating layer over conductive substrate for connectors and housings.

Gaskets & boots

Integrated elastomeric gasket that cannot loosen or be mis-assembled.

Ergonomic handles

Hard core plus soft grip in one shot — tools, appliances and power equipment.

Anti-vibration parts

Elastomeric dampers molded over rigid mounts and brackets.

Double Shot vs Overmolding vs Glue

CycleTwo materials in ONE cycle on a rotary or index platen — faster than mold-and-assemble.

BondChemical/mechanical interlock between the two melts — stronger than glue.

ToolingTwo-cavity or rotating-core tool; higher upfront cost, lower per-part cost at volume.

vs OvermoldingOvermolding runs two cycles (substrate first, then second shot). Double-shot does it in one.

FAQ

Double 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.

HOW IT WORKS

From Inquiry to Delivery

First Shot: Rigid Substrate

The structural part (PC, ABS, PP or PA) is injected into cavity A at the molding temperature, packed and cooled to a solid substrate.

Rotate or Index

The mold rotates 180° on a rotary platen — or the core indexes to the next station — so the cooled substrate now faces cavity B without leaving the machine.

Second Shot: Elastomer or Second Color

TPE, TPU, TPV or a second color is injected over the substrate while it is still warm enough to weld; a chemical bond and a mechanical interlock form at the interface.

Cool, Eject, Ship

The two-material part cools, ejects as one piece and is trimmed of gate vestiges — no assembly station, no adhesive, no press-fit, no alignment risk.

Ready to Start Your Double Shot 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.