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Difference between Overmolding and 2K Molding

    Rapid Mold and Prototype Mold

    Overmolding and 2K molding are two popular plastic injection molding techniques used to manufacture complex plastic parts. While both methods involve molding two or more materials together, there are some significant differences between the two. Here are the main differences:

    Difference between Overmolding and 2K Molding


    Overmolding is a process of injecting a second material over the first substrate material, creating a seamless bond with the first material. The process involves two separate molding cycles, with the first cycle molding the substrate and the second cycle molding the overmold.

    2K molding, on the other hand, is a process of molding two different materials in one molding cycle. The process involves the use of two barrels and two nozzles, each with a different material. The two materials are molded together in a single injection-molding cycle.


    Overmolding is typically used with thermoplastic elastomers (TPE) or liquid silicone rubber (LSR) as the overmold material, and rigid thermoplastics as the substrate material.

    2K molding allows for more flexibility in material selection, including the use of soft-touch materials like TPE, hard plastics, and even metal or glass inserts.

    Design and Applications

    Overmolding is ideal for creating a soft-touch grip or ergonomic design on a rigid substrate. It can also be used to create a seal or gasket for water resistance or insulation.

    2K molding allows for more complex part designs, such as combining two colors, textures, or even different materials to create a single part. It is ideal for automotive parts, medical devices, and consumer products that require multiple materials for functionality and aesthetics.

    In conclusion, while both overmolding and 2K molding techniques involve molding two or more materials together, they differ in the number of molding cycles, material selection, and design flexibility. Manufacturers should carefully consider the requirements of their specific application before selecting a molding technique.