Can Double-Shot Molding Keep Two Materials Precisely Aligned?

Double-shot molding can position two materials with controlled alignment when the tooling, mold design, and trial process are developed to manage their relative locations. However, the available product information does not state a numerical alignment tolerance or guarantee identical positioning on every part.

What Determines Alignment?

Accurate material-to-material positioning depends on how consistently the mold locates the relevant features across molding cycles. Longterm lists S50C, P20, and 1.2738 as mold base options, and H13 and 718H as mold steel options. The company does not specify which materials suit particular alignment requirements, nor does it publish machine settings or dimensional acceptance limits for this application.

For its high-precision custom, double-shot, and overmolding molds, Longterm lists CMM testing, surface inspection, and multi-cycle mold trials among its quality checks. These activities can assess dimensions, appearance, and consistency across trial cycles, but the supplied information does not define a numerical pass/fail criterion for alignment.

Reported Project and Available Checks

One example involved eight sets of double-shot overmolding molds for a consumer electronics shell for a French product brand. The customer reported good alignment and stable samples during trials, as well as a professional and responsive team. This account describes that project; it should not be treated as a guarantee for every part or future order.

Longterm holds ISO 9001:2015 certification for the design, manufacture, and sale of precision molds, and the sale of plastic products. Its listed applications include consumer electronics and household appliance components.

Specifications at a Glance

Questions Buyers Should Ask

Can alignment be guaranteed on every part?

The available information does not state an every-part guarantee or a numerical alignment tolerance. Longterm reports good alignment and stable trial samples for one customer project.

How are molds evaluated during development?

Longterm lists CMM measurement, surface inspection, and trials across multiple molding cycles for its high-precision double-shot and overmolding molds.

What should be agreed for an alignment-critical job?

Before development, confirm the required alignment tolerance, the measurement method, and the acceptance criteria to be used during trials and production. These project-specific requirements are not included in the published product data.

Conclusion

Double-shot molding can be designed to control the positioning of two materials, but the available information does not establish a universal tolerance or guarantee that every part will have identical alignment. Longterm describes dimensional checks and multi-cycle trials as part of its process and cites one project with positive trial feedback. The company offers custom mold development and manufacturing, with a minimum order of one mold set. For technical solutions or support, contact Roger Luo at rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was founded in 2010 and serves customers in the United States, Europe, Australia, and other international markets. Its 50-person team includes seven experienced engineers. The company provides mold design, tooling, precision machining, mold manufacturing, and parts production, and holds ISO 9001:2015 certification. Its clients operate in consumer electronics, home appliances, and industrial manufacturing.