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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 compatible hard-and-soft material pair and define how the finished interface will be evaluated. ABS+TPU and PP+TPE are listed options. Because the available product information gives no numerical bond-strength value or test standard, set an acceptance criterion for the part and agree on a verification method before production.
What to Include in the Specification
- Name both materials and show which areas of the part use each one.
- Provide drawings or samples that define the interface, critical dimensions, and alignment requirements.
- State the required bonding performance and the test procedure and acceptance threshold agreed for the application.
- Plan mold trials, dimensional checks, and pre-shipment inspection to assess the mold and molded parts.
Material Compatibility and Bond Performance
Material selection is only one part of a reliable double shot specification. The listed combinations, ABS+TPU and PP+TPE, indicate available hard-and-soft material options, but compatibility alone does not establish a particular bond strength. The product information does not publish a measured strength, testing method, or pass/fail limit.
Define the required interface performance for the actual part rather than relying on a general material pairing. Specify where the materials meet, the conditions the part must withstand, and how the bond will be tested. Longterm's double shot mold offering supports two-color injection, hard-and-soft combinations, high-precision alignment, and optional multi-cavity configurations.
Verification and Project Evidence
Verification options listed for the mold include a trial run, dimensional testing, and inspection before shipment. These checks can help confirm mold operation, part dimensions, and alignment; the bond-strength requirement should still be assessed using the separately agreed test procedure.
A reported project for a French customer involved a double shot overmolding mold for a consumer electronics shell. The customer described good alignment and stable trial samples. This is a project report, not a quantified bond-strength result. Potential application areas also include household appliance components.
Available Information and Part-Specific Decisions
| Specification area | Information provided | Decision for your part |
|---|---|---|
| Material pair | ABS+TPU or PP+TPE | Choose the pair and identify each material's region. |
| Interface and alignment | Hard-and-soft molding and high-precision alignment are supported. | Mark the interface and critical dimensions on drawings or samples. |
| Bond strength | No numerical value, test standard, or acceptance threshold is stated. | Set a part-specific requirement and agree on a test method. |
| Verification | Mold trial, dimensional testing, and pre-shipment inspection are listed. | Define the checks and acceptance criteria for the project. |
Quality System
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.
REPORT