Two-shot Injection Molding: Case Study of a High-Precision Product

Two-shot injection molding (dual-shot injection molding) is an advanced manufacturing technique that allows two different materials or colors to be injected into one mold, forming a single, integrated part. It is widely used in consumer electronics, automotive, and household products.

Project Overview 

Our client, a European home appliance manufacturer, needed a durable and visually appealing shell that combined transparent and colored plastic in one part. They required high precision to ensure a perfect fit and excellent surface finish, as the shell would be a visible component of the final product. 

Our Solution 

SG PROTO used a dual-shot injection molding process with PC (polycarbonate) and ABS materials. The first shot formed the main structure using colored ABS, while the second shot molded transparent PC over specific areas. This combination provided high impact strength, color contrast, and excellent transparency.  

Throughout the process, our engineering team optimized mold design, gating system, and injection parameters to ensure perfect adhesion and dimensional accuracy between the two materials. 

Results and Advantages 

The final parts met all dimensional and aesthetic requirements. Compared with traditional overmolding, two-shot injection molding reduced production steps and assembly costs, while enhancing the product’s premium look. 

This project demonstrates how two-shot injection molding enables manufacturers to produce complex, multi-material parts efficiently and attractively.

Contact us today to customize a solution for your injection molding project.