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China Injection Molding Overmolding Service

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

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
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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 plastic

plastic over metal

Plastic over metal

rubber over metal

Rubber over metal

Rubber over plastic

Rubber over plastic

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
overmolded product

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:
urethane casting

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

Overmolding Guide

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

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

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
semi-gloss surface

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
matte surface

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
texture surface

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

extruded overmolding
overmolded product
overmolding example
overmolding metal
overmolding part
rubber overmolding metal
rubber overmolding
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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

Robitic Featured
Robotics & Automation
Sports and Recreational Featured
Sports and Recreational
Medical Equipment Featured
Medical Device
Industrial Machinery Featured
Industrial Machinery
Consumer Electronics Featured
Consumer Electronics
Automotive Featured
Automotive

Overmolding FAQs

Overmolding layers materials sequentially, while insert molding combines pre-existing components into a mold.
Yes, it is ideal for combining hard plastics with softer, flexible materials.
Yes, prototypes are available to validate designs before mass production.
We require design files, material preferences, and production quantities.
Yes, we provide international shipping and logistics support.

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