Choosing a Double Shot Molding Process for Reliable Two-Material Bonding

Selecting a double shot molding process starts with matching the material combination to the part specification. Then assess registration accuracy, cavity configuration, and trial results before authorizing production. Longterm provides custom overmolding molds for hard-and-soft combinations such as ABS+TPU and PP+TPE.

How to Evaluate a Double Shot Mold

1. Confirm the material combination

Check that the proposed materials meet the part’s functional and design requirements. Longterm lists ABS+TPU and PP+TPE among its supported combinations. Since the available product information does not include a complete compatibility test matrix, confirm the specific pair with the mold supplier.

2. Define alignment and cavity needs

Review the part geometry and production volume to determine the required alignment precision and number of cavities. The custom mold can be designed for high-precision alignment, with multi-cavity configurations available as an option.

3. Validate tooling and samples

The stated mold steel is 718H / 1.2738, with a service life of up to 800,000 shots. Before approving the tool, review the mold trial, dimensional test results, and pre-shipment inspection. Longterm’s custom mold inspection process also includes first-article checks, full-dimension measurement, and mold running tests.

Product Details to Compare

Applications and Quality Credentials

Double shot tooling can be used for consumer electronics parts, including housings and accessories. Longterm reports a double shot overmolding project for an electronics shell in France, where the customer noted accurate alignment and stable trial samples.

Longterm holds ISO 9001:2015 certification covering the design, manufacture, and sale of precision molds, as well as the sale of plastic products.

Frequently Asked Questions

What material pairs are available?

The listed hard-and-soft combinations include ABS+TPU and PP+TPE. Confirm suitability for your specific part with the supplier.

What should I review before accepting a mold?

Check trial parts, dimensional measurements, and pre-shipment inspection results. First-article inspection and mold running tests are also listed in Longterm’s custom mold quality process.

Can the design use multiple cavities?

Yes. Multi-cavity tooling is an optional configuration. Discuss the appropriate layout with the supplier based on the part design and production requirements.

Recommendation

Choose the process by verifying the material pair, specifying alignment and cavity requirements, and evaluating trial samples and dimensional results before production approval. Longterm provides custom mold making, injection molding, and mold development with plastic injection mass production. The MOQ for mass production is negotiable. For technical information or project support, contact rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was established in 2010. It serves international customers with mold design, tooling, precision machining, mold manufacturing, and parts production. Its R&D team includes five engineers focused on molds and precision machining, with capabilities in injection mold structural design, precision CNC component solutions, sample verification, and process optimization. The company is ISO 9001:2015 certified and works with customers across multiple industries.