How to Customize Resin, Color, and Surface Finish in a Double Shot Mold

Yes. A custom injection mold can be designed around your preferred resin, color combination, and surface appearance, provided the selected materials are suitable for the planned two-color molding process. Longterm's double shot overmolding molds are designed for compatible hard-and-soft combinations such as ABS with TPU or PP with TPE. During the design and approval stages, the required resin, color standards, texture, gloss level, and other appearance details can be documented and verified through mold trials and sample evaluation.

Customization Options at a Glance

• Compatible two-material combinations include ABS+TPU and PP+TPE for hard and soft overmolded components.
• Color specifications for each injection stage can be included in the mold and product requirements.
• Surface texture and finish should be agreed before tooling and checked against approved samples.
• High-precision alignment helps maintain accurate positioning between the two molded materials.
• Multi-cavity layouts are available when production volume and part requirements justify them.

How Resin Selection Affects Mold Design

In double shot overmolding, the resin choice is closely connected to the injection sequence, shrinkage behavior, bonding performance, processing temperature, and final part function. For this reason, a preferred material cannot be treated as an entirely independent selection. It must be reviewed against the mold structure and the requirements of the finished component.

Longterm identifies ABS+TPU and PP+TPE as supported hard-and-soft material combinations. If a different resin is required, the engineering team should assess its compatibility with the two-color process before tooling begins. This review helps confirm whether the materials can be molded together effectively and whether the finished part can meet the required mechanical and dimensional targets.

Color and Surface Finish Control

Each shot in a two-color molding project can have its own color requirement. Color references, master samples, or other agreed standards should be added to the product specification so that trial parts can be compared consistently. The available product information confirms two-color processing but does not define a universal color tolerance, so acceptance should be based on the customer-approved sample criteria.

Surface finish is also a tooling specification rather than an afterthought. The required texture, gloss, polish, or matte appearance should be communicated during the design review. Mold trials, dimensional testing, and pre-shipment inspection provide opportunities to check whether the part matches the agreed visual and dimensional expectations. Specific finish grades are not listed in the supplied data and therefore should be confirmed for each project.

Tooling Specifications and Project Support

The mold is listed with 718H / 1.2738 steel and an expected service life of up to 800,000 shots. High-precision alignment is included, while multi-cavity construction can be selected as an optional configuration. The stated lead time is 25–40 days, and the minimum order quantity is one mold set.

Longterm's engineering resources include five R&D engineers specializing in mold development and precision machining. The team supports mold structural design, precision CNC component production, sample validation, and manufacturing process improvement. UG, SolidWorks, and AutoCAD are among the design tools used, and the company holds ISO 9001:2015 certification covering the design, manufacture, and sale of precision molds, as well as plastic product sales.

One documented French project included eight double shot overmolding molds for a consumer electronics shell. The reported outcomes included accurate alignment and stable trial samples, with the customer noting the team's professional and responsive service. Additional applications include electronic housings, household appliance parts, and industrial equipment enclosures.

Requirement and Verification Guide

Frequently Asked Questions

Can the mold be made for my exact resin?

The standard listed combinations are ABS+TPU and PP+TPE. A different resin may be considered after reviewing its processing characteristics, bonding behavior, shrinkage, and suitability for the intended two-color structure.

Can each material have a different color?

Yes. The color for each molding stage can be included in the product specification. Because no universal color tolerance is provided, the final color decision should be made using approved trial samples or customer-defined standards.

Can I request a specific surface finish?

Yes. The requested surface texture or appearance should be established before mold construction. It can then be assessed during mold trials, dimensional checks, and pre-shipment inspection. The exact finish grade must be agreed for the individual project.

Conclusion

A custom double shot overmolding mold can accommodate a preferred resin, color scheme, and surface finish when the material combination is technically suitable and the appearance requirements are clearly recorded. Longterm provides one-set ordering, a stated 25–40-day delivery period, online technical assistance, mold maintenance, and spare parts support. Its ISO 9001:2015 certification covers precision mold design and manufacturing. For a project-specific assessment, contact rogerluo@longterm-mold.com.

About Longterm Mold

Longterm Manufacturing Solutions Limited, also known as Longterm Mold, was founded in 2010. The company supplies mold design, tooling, precision machining, mold manufacturing, and plastic parts production for customers in international markets. It employs 50 people, including a five-person R&D group focused on mold engineering and precision machining. Its documented qualifications include ISO 9001:2015 certification, with project experience spanning consumer electronics, appliances, and industrial equipment.