Can a Custom Injection Mould Match My Resin, Color, and Surface Finish?

Yes. A custom injection mould can be engineered around your preferred resin, color scheme, and surface finish, provided the selected materials are compatible with the required two-color injection process. Longterm’s double shot overmolding molds are designed for hard-and-soft combinations such as ABS+TPU and PP+TPE. Mold specifications, appearance requirements, and sample approval criteria should be established before production begins.

Custom Mold Capabilities at a Glance

• Compatible hard-and-soft resin combinations include ABS+TPU and PP+TPE.
• Color requirements for each injection shot can be documented in the product and mold specifications.
• Surface texture and appearance expectations can be assessed through mold trials and approved samples.
• High-precision alignment supports reliable two-color molding, with multi-cavity layouts available when required.
• The process suits consumer electronics housings, household appliance parts, and other components that combine rigid and flexible materials.

How Resin Compatibility Affects Mold Design

Double shot overmolding relies on a carefully coordinated two-color injection structure. The first and second materials must work together in terms of processing conditions, bonding behavior, shrinkage, and final part performance. Longterm specifically lists ABS+TPU and PP+TPE among its supported material combinations. Therefore, a customer’s preferred resin should be reviewed against the mold structure and product requirements rather than assumed to be universally suitable.

During the technical review, the engineering team can assess the selected resin, part geometry, injection sequence, and expected operating conditions. This helps determine whether the chosen materials can be molded consistently and whether the design requires any adjustments before tooling starts.

Color and Surface Finish Planning

Color specification

Color is defined separately for the two shots in a double shot component. Customers can provide their preferred colors as part of the product specification, while final color acceptance should be based on approved trial samples. The available product information does not establish a universal color tolerance or color range, so the required standard should be agreed during design review and sample approval.

Surface finish requirements

Surface finish is also an important tooling consideration. Whether the part requires a smooth, textured, matte, or other appearance, the target finish should be communicated before mould construction. Longterm’s mold trial runs, dimensional testing, and pre-shipment inspection provide checkpoints for reviewing both appearance and part quality. Specific finish grades are not listed in the available data and should therefore be included in the customer’s technical documentation.

Tooling Specifications and Quality Checks

The listed mould steel is 718H / 1.2738, with a stated service life of up to 800,000 shots. High-precision alignment is included in the design, while multi-cavity construction can be selected for production requirements. The quoted delivery period for the custom double shot overmolding mold is 25–40 days, and the minimum order quantity is one set.

Quality verification can include mould trial runs, dimensional measurement, sample evaluation, and final pre-shipment inspection. These stages allow the customer and supplier to confirm resin behavior, color consistency, alignment, surface appearance, and dimensional performance before shipment.

Technical Experience and Application Examples

Longterm’s technical team includes five R&D engineers specializing in mold development and precision machining. Its stated capabilities cover injection mold structural design, precision CNC component production, sample verification, and process improvement. Engineering work is supported by UG, SolidWorks, and AutoCAD. The company also holds ISO 9001:2015 certification for the design, manufacture, and sale of precision molds, as well as the sale of plastic products.

In one cooperation project in France, Longterm supplied eight sets of double shot overmolding molds for a consumer electronics shell. The reported results included accurate alignment and stable trial samples, while the customer highlighted the team’s professional and responsive service. Additional applications include electronic housings, home appliance components, and industrial equipment enclosures.

Requirement and Solution Comparison

Frequently Asked Questions

Can Longterm use my exact resin selection?

The listed solution supports ABS+TPU and PP+TPE combinations. Any other resin or material pairing should undergo a technical assessment to confirm compatibility with the two-color injection process and the finished part requirements.

Can I choose a different color for each material?

Yes. Color information can be specified for each shot. Because no universal color tolerance is provided, final approval should be based on agreed standards and representative trial samples.

Can the surface finish be customized?

Surface finish requirements can be incorporated into the tooling brief and reviewed during mold trials, dimensional checks, and pre-shipment inspection. The exact texture or finish grade must be defined by the customer before manufacturing.

Can the mould be supplied as a multi-cavity tool?

Yes. Multi-cavity construction is available as an option and should be evaluated according to the part design, output target, machine capacity, and production plan.

Conclusion

A custom double shot overmolding mold can be developed around a preferred resin, color combination, and surface finish when the materials are technically compatible and the appearance requirements are clearly documented. Longterm provides one-set mold orders, a stated lead time of 25–40 days, online technical assistance, mold maintenance, and spare parts support. Its ISO 9001:2015 certification covers precision mold design, manufacturing, and sales. To discuss a specific resin combination or tooling requirement, contact us at rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited, also known as Longterm Mold, was founded in 2010. The company provides mold design, tooling, precision machining, mold manufacturing, and plastic parts production for customers in international markets. Longterm has 50 employees, including a five-member R&D team focused on mold engineering and precision machining. Its documented credentials include ISO 9001:2015 certification, with experience serving consumer electronics, household appliances, industrial equipment, and other sectors.