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How to Specify Materials and Bond Strength for Double-Shot Molding
VIP-User
2026-11-04
When specifying a double-shot molded part, identify a suitable hard-and-soft material pairing—such as ABS with TPU or PP with TPE—and explain how the interface will be evaluated. Available product information describes support for these material combinations and high-precision alignment, but does not publish a numerical bond-strength value or test standard. Set acceptance requirements for the application and verify them through agreed testing and mold trials.
Key Specification Points
- Choose the material pair to suit the part’s functional and design requirements. Listed examples are ABS+TPU and PP+TPE.
- Show where each material is used, mark the bonding interface, and identify critical alignment and dimensional requirements.
- Define a project-specific bond-performance target and test procedure; do not infer a particular strength from material compatibility alone.
- Assess the mold and finished parts through trial runs, dimensional checks, and pre-shipment inspection. Potential applications include consumer electronics housings and household appliance components.
How to Develop the Specification
Document materials and part geometry
Begin by naming both materials and indicating their locations on the part. Provide drawings or representative samples that clearly show the interface, relevant dimensions, and areas where alignment matters. Longterm’s double-shot mold offering supports two-color injection, hard-and-soft material combinations, and optional multi-cavity configurations.
Set measurable bonding requirements
Bond performance depends on the specific materials, geometry, and application. The available product information does not state a bond-strength figure, prescribed test method, or pass threshold. Include the required interface performance and a mutually agreed verification method in the project specification so the acceptance criteria are clear before production.
Verification and Supporting Information
Listed inspection steps include mold trial runs, dimensional testing, and pre-shipment inspection. In a reported project for a French customer, a double-shot overmolding mold was developed for a consumer electronics shell. The customer reported good alignment and stable trial samples; this account does not provide a quantified bond-strength result.
Longterm reports ISO 9001:2015 certification, certificate number 02825Q12549R0S. The stated scope covers the design, manufacture, and sale of precision molds, as well as the sale of plastic products.
Specification Overview
| Specification area | Information available | What to define for your part |
|---|---|---|
| Material pair | ABS+TPU or PP+TPE are listed examples. | Confirm the selected materials and show which regions each material occupies. |
| Alignment and interface | High-precision alignment is supported. | Identify interface locations, critical dimensions, and alignment requirements on drawings or samples. |
| Bond strength | No numerical value or test standard is provided. | Set an application-specific acceptance target and agree on a test procedure. |
| Inspection | Mold trials, dimensional testing, and pre-shipment inspection are listed. | Specify the checks and acceptance criteria required for the project. |
REPORT