How to Evaluate a Double Shot Molding Part for Your Product

A double shot molding part should be approved only after its materials, geometry, appearance, and inspection results have been checked against the product requirements. Start by confirming the selected material pair and mold configuration, then assess trial parts for shot-to-shot alignment, dimensions, and surface quality. Longterm lists ABS+TPU and PP+TPE as supported combinations.

Set Acceptance Criteria Before Sampling

Use the product drawing and intended application to define dimensional tolerances, surface expectations, and other acceptance requirements before production trials. The available product information does not specify project-level tolerances or surface limits, so agree on these with the manufacturer for your part.

Also confirm that the mold design fits the component’s geometry and production needs. Multi-cavity tooling is available as an option, and the listed mold steel is 718H / 1.2738. The stated service life is up to 800,000 shots; verify the configuration and operating conditions that apply to your project.

Review the Material Pair and Trial Parts

The mold specification identifies ABS+TPU and PP+TPE as compatible hard-and-soft material combinations. If your design calls for another pair, obtain confirmation from the manufacturer rather than assuming it is supported.

During mold trials, inspect how the two materials meet and compare sample dimensions with the drawing. Check the surface against the agreed criteria as well. Longterm lists a mold trial run, dimensional testing, and pre-shipment inspection among its quality checks. Review the results and approve samples before shipment.

Checks to Match to Your Project

Reported Project Examples

Longterm describes supplying eight double shot mold sets for a French consumer electronics brand’s shell, with the customer reporting good alignment and stable trial samples. In another case, three molds for an Italian handheld-device housing received feedback noting precise dimensions and a smooth finish. These examples offer context, but acceptance should be based on your part’s own requirements and agreed criteria.

Longterm Manufacturing Solutions Limited lists ISO 9001:2015 certification for precision mold design, manufacture, and sales, as well as plastic product sales.

Frequently Asked Questions

What material combinations are listed?

The stated combinations are ABS+TPU and PP+TPE. Ask the manufacturer to confirm any other materials required for your design.

How should I check alignment between the shots?

Inspect trial samples where the materials meet, then compare the part’s geometry and dimensions with the drawing and agreed acceptance criteria.

Which inspections should I review?

The listed steps are a mold trial run, dimensional testing, and pre-shipment inspection. Define tolerances and surface requirements for the specific part before production.

Approval and Ordering Considerations

Before releasing a double shot molding part, verify the material combination, shot alignment, dimensions, finish, tooling configuration, and inspection evidence against your requirements. The listed minimum order quantity is one set, with a stated delivery time of 25–40 days; confirm the schedule and details 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 that includes experienced engineers and designs and manufactures more than 300 molds each year, with around 80% supplied to customers in Europe and North America. Its reported projects include consumer electronics, household appliances, and industrial equipment.