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Overmolding Services

Using overmolding to combine two or more materials to improve the performance and appearance of prototypes and production parts.

ISO 9001:2015 | ISO 13485:2016 | IATF16949

What is the Overmolding?

Overmolding, also known as two-shot molding or multi-material molding, is a plastic injection molding process where two or more different materials are combined to produce a single, integrated part. This process involves molding one material (usually a soft or elastomeric material) over another material (usually a rigid plastic or metal component) to create a final product with improved functionality, aesthetics, or ergonomic features.

overmolding process

Boyi Overmolding Capabilities

Boyi provides you with high-quality and customized solutions. Whether you need to quickly validate new product designs, produce a small number of prototypes, or produce specific quantities of parts on demand.

Standards Metric units Imperial units

Maximum Part Size

345×125×55 mm

13.6×4.92×2.16 in.

Minimum Part Size

2×2×3 mm

0.08×0.08×0.12 in.

Projected Mold Area

112,903 sq. mm (plastic)
30958 sq. mm (silicone rubber)

175 sq in. (plastic)
48 sq. in. (silicone rubber)


101mm from parting line
Up to 203.2mm if the parting line can pass through middle of part

4 in. form parting line
Up to 8 in. if the parting line can pass through middle of part


±0.025 mm

±0.001 in.



0.004 in.


966837 cu. mm

59 cu. in.

Mold Validation

Provide T0, T1, T2 samples before mass production

Lead Time

From mold making to sample delivery: 15-45 business days

Materials for Overmolding

We provide various materials for overmolding to create products with different characteristics and functions. Please review our material list:

Base Substrate

Soft Overmold

Overmolding Materials

Gallery of Overmolding Parts

Overmolding Benefits

This process offers several benefits in various industries. Here are some of the key advantages of overmolding:

custom overmolding parts

Application of Overmolding

Overmolding finds applications in various industries, and specific of components that benefit from this process include:

Why Choose Boyi for Overmolding?

Choosing Boyi for overmolding allows our experienced professionals to provide personalized services and comprehensive support one-on-one, ensuring that the product meets expected requirements and standards.


Strict Tolerance Standards

We ensure that each product meets high standards and precision requirements. The tolerance is as low as ± 0.025mm.


Endless Options

With our advanced equipment and precise functions, we offer hundreds of materials to choose from for your order.


Manufacturing Network

We have obtained ISO 9001:2015 certification. Provide professional customized services and comprehensive support.

What is the Difference Between Overmolding and Insert Molding?

Overmolding is the process of covering a material on the surface of another part to enhance its functionality or appearance. Insert molding is the process of placing prefabricated inserts in a mold, and then injecting plastic around the insert to fix it in a plastic component.

Assuming we are going to manufacture a tool:

Overmolding is like covering the handle of a tool with a rubber coating, increasing grip comfort and slip resistance. Insert molding is like inserting a small screwdriver into the plastic handle of the cutting tool, making it a complete component that is both convenient to use and durable.

About Overmolding FAQ

Overmolding is the process of first injection molding the basic components, and then adding another material (covering layer) to a specific area or surface. This usually requires an additional injection molding process to add a second layer of material and ensure that the two materials can be firmly combined into a single part.

The production cycle may vary depending on project complexity and requirements. Normally, we can complete customized prototypes or on-demand production of parts within the shortest 15 days. We are committed to efficient production processes to ensure timely delivery of high-quality finished products.

Overmolding is widely used in many industries, including medical devices, automobiles, consumer goods, electronics, and more. From soft handles in medical devices to anti slip functions in automotive parts, they can all be achieved through overmolding.

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