Plastic Injection Molding - Overmolding



What is Overmolding?

Stack Plastics provides a number of specialized plastic injection molding services, including overmolding, which is the process of combining two or more molded plastic or elastomer parts to make a single finished product. One common example of this is a toothbrush with a stiff frame and rubberized grips on the handle. In the process, the base layer part is molded then the additional plastic layer(s) are molded over and around the original part.

The Overmolding Process

Overmolding is a very difficult process, requiring adherence to the very tightest of tolerances. The general concept is quite similar to insert molding, but has more opportunity for mistake and a much smaller margin of error. Stack Plastics' overmolding processes create parts specifications as tight as 0.001”. We utilize the finest high-tech injection molding equipment for our services for the highest possible quality and superb repeatability.

Because the materials we use shrink as they cool following the molding process, special consideration must be made in the creation of our molds. And, as Stack Plastics uses a number of different materials in overmolding, all of which have different cooling/shrinking properties, it is crucial that we create our molds to match the specific properties of the material(s) being used. Our mold designers will perfectly match their mold specs to the unique needs of your overmold project.

Injection Overmolding with Stack Plastics

The variety of materials we use, the precise capabilities of our equipment, and our mold design services make our overmold processes extremely customizable. Stack Plastics will work with you to create the ideal solution for your exact needs. No matter what the specifications of your project, no matter how low- or high-volume your production run will be, Stack Plastics will meet or exceed the expectations of your next overmolding project.

Contact Stack Plastics to put our overmolding services to work for you today.