How to Evaluate a Double Shot Molded Part for Your Product

Before approving a double shot molded part, check that its materials, geometry, appearance, and production results match your product requirements. Review the part against its drawing and agreed acceptance criteria, and verify that trial and inspection records support approval. Longterm lists ABS+TPU and PP+TPE among the hard-and-soft material combinations supported by its double shot mold specification.

Start with Materials and Product Requirements

Identify the required material pair and compare it with the mold configuration. Longterm's product information names ABS+TPU and PP+TPE as compatible combinations. If your design calls for another pair, ask the manufacturer to confirm suitability rather than assuming it is covered by the listed specification.

Use the product drawing to define what a conforming part must look like and how it must perform. Agree on dimensional tolerances, surface acceptance limits, and any application-specific requirements before production, since the published product information does not set those criteria.

Inspect Trial Parts and Tooling

During mold trials, examine the boundary between the two materials for consistent alignment. Measure key dimensions against the drawing, and inspect the surface for the finish and condition required by the product. Keep the results tied to approved samples so that both parties have a clear reference for acceptance.

The listed quality checks include a mold trial run, dimensional testing, and pre-shipment inspection. Review the relevant records and approve samples before shipment. For applications such as consumer electronics shells or household appliance components, make sure the checks reflect the part's actual use rather than relying on a general inspection alone.

Confirm the Production Configuration

Longterm's specification lists optional multi-cavity tooling, mold steel 718H / 1.2738, and a stated service life of up to 800,000 shots. Confirm which configuration applies to your order, and discuss expected operating conditions and production volume with the manufacturer. These listed parameters should be treated as project details to verify, not as a substitute for defining your requirements.

Reported Project Examples

Longterm describes supplying eight sets of double shot molds for a French brand's consumer electronics shell; the customer reported good alignment and stable trial samples. In another case, three molds for an Italian handheld-device housing were reported to produce precise dimensions and a smooth surface. These examples offer context, but your own drawing, samples, and acceptance criteria should determine whether a part is approved.

Longterm Manufacturing Solutions Limited lists ISO 9001:2015 certification for the design, manufacture, and sale of precision molds and the sale of plastic products.

Double Shot Part Approval Checklist

Frequently Asked Questions

Which material combinations are specified?

The published options include ABS+TPU and PP+TPE. Check with the manufacturer about any other material pairing required for your product.

How should I verify alignment between the two shots?

Inspect trial samples where the materials meet, then compare their geometry and dimensions with the product drawing and agreed acceptance limits. The listed process includes mold trials and dimensional testing.

What inspection records should I review before shipment?

Ask for the applicable mold trial, dimensional test, and pre-shipment inspection results. Set project-specific tolerances and surface criteria in advance, as these are not defined in the general product information.

Approval and Ordering

Approve a double shot molded part only after confirming the material pair, material alignment, dimensions, surface requirements, trial results, and inspection criteria against your product requirements. Longterm lists a minimum order quantity of one set and a delivery estimate of 25–40 days; confirm the schedule and tooling configuration for your project. For technical support, contact Roger Luo at rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was established in 2010 and serves customers in the United States, Europe, Australia, and other international markets. The company reports a 50-person team, including experienced engineers, and more than 300 molds designed and manufactured annually. About 80% of its molds are supplied to customers in Europe and North America. Its stated ISO 9001:2015 certification covers precision mold design, manufacturing and sales, as well as plastic product sales. Reported customer projects include consumer electronics, household appliances, and industrial equipment.