China Injection Molding Overmolding Service

Get overmolding parts that combine different materials into a single part with improved functionality and durability.

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We specialized in injection molding Overmolding Service that combine multiple materials into a single component.

Overmolding is a manufacturing process where multiple types of materials are molded together to form a single cohesive component. It is a two-step procedure, start with a pre-shaped substrate material, which can be made from plastic, metal, or other material, then covered with an additional layer of plastic or rubber.

Benefits of overmolding include:

Improved functionality with better shock absorption, and insulation
Ehanced grip and tactile feel by adding layer to a rigid part
Multi-color or multi-material design that improve aesthetics
Protective layer increased part durability
Reduce assembly steps, and cost saving

Overmolding Services Specifiactions

We offer a range of overmolding options tailored to meet precise manufacturing requirements. The table below provides an overview of our key capabilities.

Service	Details
Process Materials	Most plastics and rubber, including custom sourcing, see material list below
Standard Finishes	SPI and VDI
Mold Service	DFM report and mold flow analysis
Mold Ownership	Customer owned with regular mold maintenance
Mold Cavities	Single or multi-cavities
Mold Life	Unlimited (If the mold worn out, Erye will cover the cost for the new set of mold)

Overmolding Service Process

Plastic over plastic

Plastic over metal

Rubber over plastic

Rubber over metal

Materials for Overmolding Service

Substrate Materials for Overmolding

The substrate material in overmolding is the primary component, typically a rigid or structurally sound material, onto which a second material is molded. It provide the base structure and support for the final part. Our common substrate materials include:

Plastics

Polypropylene (PP)
Polyethylene (PE)
Acrylonitrile Butadiene Styrene (ABS)
Polycarbonate (PC)
Nylon (PA)
Polyurethane (PU)

Metals

Aluminum
Steel
Brass

Composites

Glass-reinforced plastics
Carbon-reinforced plastics

Bonding Materials for Overmolding

Overmolding bonding materials are the secondary layer that applied over the substract. It enhances the part's functionality and performance. Our common bonding materials include:

Rubbers

Silicone
EPDM
NR (Natural rubber)
NBR (Nitrile butadiene rubber)
SBR (Styrene-butadiene)
CR (Chloroprene rubber, neoprene)
FKM (Fluoro-Elastomer)
FKKM (Perfluorelastomer)

Thermoplastics

Thermoplastic Elastomers (TPE)
Thermoplastic Polyurethane (TPU)
Polyvinyl Chloride (PVC)
Polyurethane (PU)

Overmolding Guide

The complete overmolding design guide. Learn what it is and design consideration, ensure to optimize your overmolding outcome.

Overmolding Surface Finishing Standard

To meet diverse aesthetic and functional requirements, Erye offers mold surface finishes according to both the SPI and VDI standards. Our injection mold standards guide the texture and smoothness of molded surfaces, ensuring that each part achieves the desired finish, from mirror-like surfaces to textured patterns.

Finishing	Description	Price Range	SPI Grades
SPI A: Glossy Finish	Provides a highly reflective surface, ideal for aesthetic applications such as consumer products.	$$$	SPI A1, A2, A3
SPI B: Semi-Gloss Finish	Offers a moderate sheen, balancing gloss and matte, suitable for parts needing some visual appeal without being overly shiny.	$	SPI B1, B2, B3
SPI C: Matte Finish	Features a non-reflextive surface that reduce glare, often used for functional parts where aesthetics are less critical.	$$	SPI C1, C2, C3
SPI D: Dull Finish	Enhances grip and durability, commonly applied to functional components to improve handling and reduce wear.	$$$	SPI D1, D2, D3

SPI A: Glossy Finish

Provides a highly reflective surface, ideal for aesthetic applications such as consumer products.

Price Range: $$$
SPI Finish Grades: SPI A1, A2, A3

SPI B: Semi-Gloss Finish

Offers a moderate sheen, balancing gloss and matte, suitable for parts needing some visual appeal without being overly shiny.

Price Range: $
SPI Finish Grades: SPI B1, B2, B3

SPI C: Matte Finish

Features a non-reflective surface that reduces glare, often used for functional parts where aesthetics are less critical.

Price Range: $$
SPI Finish Grades: SPI C1, C2, C3

SPI D: Textured Finish

Enhances grip and durability, commonly applied to functional components to improve handling and reduce wear.

Price: $$$
SPI Finish Grades: SPI D1, D2, D3

Gallery of Overmolding Parts

Advantages of Overmolding with Us

At Erye, we offer expert overmolding services to create high-performance, multi-material parts that combine the benefits of rigid and flexible components in a single piece. With over 40 years of experience, we provide tailored solutions for complex designs and demanding applications. Whether you're looking to improve part durability, enhance functionality, or reduce assembly costs, Erye delivers consistent, high-quality results.

Enhanced Functionality

Our overmolding process allows for the integration of different materials, resulting in components that provide improved grip, insulation, and impact resistance.

Reduced Assembly Time and Costs

By combining multiple components into a single part, overmolding simplifies the manufacturing process and reduces the need for additional assembly, saving time and labor costs.

Improved Durability

The overmolding layer protects the underlying substrate, enhancing the overall durability and lifespan of the component against wear and environmental factors.

Overmolding Applications

Robotics & Automation

Sports and Recreational

Medical Device

Industrial Machinery

Consumer Electronics

Automotive

Overmolding FAQs

How does overmolding differ from insert molding?

Overmolding layers materials sequentially, while insert molding combines pre-existing components into a mold.

Can overmolding handle soft and hard material combinations?

Yes, it is ideal for combining hard plastics with softer, flexible materials.

Can you provide prototypes for overmolding projects?

Yes, prototypes are available to validate designs before mass production.

What information do you need to start an overmolding project?

We require design files, material preferences, and production quantities.

Do you offer global shipping for overmolded parts?

Yes, we provide international shipping and logistics support.

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