We deliver professional overmolding services for rigid-soft multi-material plastic components.
Get Instant QuoteOvermolding creates unified rigid-and-soft plastic assemblies by injecting elastomer materials onto pre-molded plastic substrates. As a flexible molding method, it eliminates tedious manual assembly and produces ergonomic anti-slip surfaces without high-cost rotary molds.
Overmolding adopts an independent two-stage molding workflow. After initial substrate production, pre-molded rigid components are transferred and reloaded into a secondary mold to achieve soft-layer integration.
Rigid plastic base is molded and completed in the first mold set.
Finished rigid parts are inspected to ensure no defects before overmolding.
Qualified bases are manually or robotically placed into the secondary mold.
Soft TPE/TPU material is injected to wrap and bond the rigid substrate.
After cooling, integrated soft-rigid parts are demolded and fully inspected.
Overmolding transfers finished substrates between separate molds, which differentiates it fundamentally from rotary two-shot (2K) molding.
Compare three mainstream multi-material molding technologies to select the right solution for your project.
| Comparison Item | Overmolding | Insert Molding | Two-Shot (2K) Molding |
|---|---|---|---|
| Working Principle | Pre-mold substrate → secondary injection over surface | Place hardware inserts → encapsulate with plastic in one shot | Two materials injected sequentially inside one rotary mold |
| Material Matches | Hard plastic + soft elastomer (TPE/TPU) | Plastic + metal/terminal/PCB inserts | Two compatible plastics, dual-color or dual-hardness |
| Bonding Method | Chemical bonding + mechanical interlock | Pure mechanical locking | Thermal fusion & chemical adhesion |
| Tooling Requirement | Standard machine, two separate molds | Standard machine, single mold | Special 2K machine + rotary mold |
| Relative Mold Cost | $$ | $ | $$$ |
| Cycle Time | 30–60s (part transfer needed) | 40–90s (affected by insert loading) | 20–40s (fully automatic) |
| Best Production Volume | Prototype ~ Medium volume | Low ~ High volume | Medium ~ High volume |
| Typical Products | Soft-grip handles, sealed wearable housings | Automotive connectors, embedded sensor parts | Two-tone trim, translucent switches |
Need technical support for your project? Send your drawing for process consultation.
Browse our finished overmolding projects covering rigid-soft integrated plastic assemblies. Each case reflects our secondary molding expertise, reliable elastomer bonding and flexible small-to-medium batch production capability.
The projects below feature plastic-to-plastic overmolded parts. For rotary in-mold dual-material molding and standard injection molding services, visit Two-Shot (2K) Molding and Injection Molding.
