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Choosing Materials and Bonding Criteria for Double Shot Molding
VIP-User
2026-11-04
When specifying a double shot molding part, identify a compatible hard-and-soft material pair and state how the interface will be evaluated. ABS with TPU and PP with TPE are listed options. Because no numerical bond-strength value or test standard is provided, define acceptance requirements for the specific application and confirm them through mold trials and part testing.
Start with the Part Requirements
Document both materials, the regions where each will be used, and the areas where their interface needs to perform. Drawings or representative samples should make the interface geometry and critical dimensions clear. Longterm's double shot mold supports two-color injection, hard-and-soft material combinations, and optional multi-cavity configurations.
Set a Bonding Acceptance Criterion
Material compatibility alone does not establish a particular bond strength. The available product information gives no bond-strength figure, test method, or acceptance threshold. Specify the performance required for the part, then agree on a test procedure with the supplier before production.
Verify the Mold and Finished Parts
Listed verification steps include a mold trial, dimensional testing, and pre-shipment inspection. These checks can help assess alignment and part dimensions; bonding performance should also be evaluated using the agreed acceptance criterion.
In one reported project, a French customer used a double shot overmolding mold for a consumer electronics shell and reported good alignment and stable trial samples. This is a project report, not a measured bond-strength result. Potential applications also include household appliance components.
Specification Checklist
- Material pair: Choose the combination for the part's hard and soft material requirements, such as ABS+TPU or PP+TPE.
- Interface and alignment: Identify bond areas, critical dimensions, and alignment requirements in drawings or samples.
- Bond performance: Define a part-specific acceptance criterion and an agreed test method.
- Inspection: Confirm trial runs, dimensional checks, and pre-shipment inspection as part of the verification plan.
Longterm reports ISO 9001:2015 certification, certificate number 02825Q12549R0S. The listed scope covers the design, manufacturing, and sales of precision molds, as well as the sales of plastic products.
REPORT