Custom Double Shot Molding for Distinctive Colors, Textures, and Materials

Custom double shot molding can combine separate colors, surface finishes, or materials in one component, provided the design and material pairing are compatible. Longterm offers double shot mold and overmolding services, with feasibility assessed from customer drawings or samples before tooling begins.

Tooling Options and Design Considerations

Because double shot molding involves multiple molding stages, the tool must locate the part accurately and maintain alignment between each shot. Longterm supports custom precision molds, including double shot and overmold tooling, for one-set mold orders. Available configurations include single- and multi-cavity designs, optional hot runners, and mold steels such as H13 and 718H.

Color zones, material interfaces, and texture requirements should be specified in the project drawings or sample parts. Longterm lists SPI and VDI surface finishes, but does not publish a fixed compatibility list for injection materials or color systems. The selected materials and their interface performance therefore require engineering review and sample testing.

Trials, Inspection, and Applications

Tooling and sample evaluation can include mold trials, dimensional checks, surface inspection, and CMM measurement. For complex precision molds, Longterm specifies multi-cycle trials to assess repeatability, part alignment, appearance, and dimensional consistency before shipment.

Double shot and overmold applications include consumer electronics shells, appliance components, automotive plastic parts, industrial equipment housings, and everyday consumer products. In a project for a French product brand, Longterm supplied double shot overmolding for consumer electronics shells. Customer feedback noted good alignment, stable trial samples, and responsive technical communication. An Italian handheld-device housing mold project was also reported to have precise dimensions, smooth surfaces, and delivery on schedule.

Service Details

Frequently Asked Questions

Can a double shot mold produce parts in different colors?

Longterm supports double shot molds and overmolding. Color zones can be considered during tooling design, with feasibility determined by the part geometry, project specifications, and materials selected.

Are custom textures available?

SPI and VDI surface finishes are listed as available options. Define the desired finish in the technical documentation so it can be reviewed during tooling design and checked through mold trials and surface inspection.

How is a material pairing assessed?

The material combination is reviewed during engineering, then evaluated through mold trials and sample inspection. Longterm does not provide a published list of compatible material pairings, so confirmation is needed before production tooling is finalized.

Planning a Custom Project

To help assess a double shot molding project, provide drawings or samples that identify the color boundaries, materials, texture, tolerances, and appearance criteria. Longterm offers one-set mold orders; mass production can be arranged through a separate mold development and plastic injection production model. Its stated quality checks include dimensional inspection, trial runs, and sample confirmation, supported by ISO 9001:2015 certification for precision mold design, manufacturing, and sales. For technical discussions, contact 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 team of 50 employees, including five R&D engineers focused on mold structure design, precision CNC component solutions, sample verification, and process optimization. Its capabilities span mold design and manufacturing, precision machining, tooling, and parts production. Longterm lists ISO 9001:2015 certification for its precision mold design, manufacturing, and sales activities.