Injection Molding

Overmolding & Insert Molding

Our rapid overmolding and insert molding processes produce custom prototypes and on-demand production parts in as fast as 15 days. We use aluminum molds that offer cost-efficient tooling, producing parts from a range of thermoplastic and liquid silicone rubber materials.

25 to 10000+ parts shipped in 15 days or less

Molds starting at 1999$

Common Applications
  • low-volume production
  • bridge tooling
  • pilot runs
  • functional prototyping

What is Overmolding?

With overmolding, the production of the substrate parts is a standard injection molding process involving an aluminum mold with no heating or cooling lines running through it. Cycle times are a bit longer, which allows our molders to monitor fill pressure, cosmetic concerns, and the basic quality of the parts. When the total run of substrate parts are molded, overmold tooling is then assembled to the press. The substrate parts are placed by hand into mold where each part is overmolded with either a thermoplastic or liquid silicone rubber material.

What is Insert Molding?

Insert molding is a similar process but instead uses a preformed part—often metal—that is loaded into a mold where it is then overmolded with a thermoplastic resin to create a final component. When the run is complete, parts are boxed and shipped shortly thereafter.

Watch: Designing Overmolded Parts

See how to important design consideration for overmolded parts can improve functionality and moldability.

Molding Options: Prototyping or On-demand Manufacturing?

Consider part quantities, lifetime maintenance, level of inspection, and cost when determining which option is right for injection molding.

Design Guidelines

Our basic guidelines for overmolding and insert molding include important design considerations to help improve part manufacturability, enhance cosmetic appearance, and reduce overall production time.

 

VIEW GUIDELINES >

Design Guidelines

Our basic guidelines for overmolding and insert molding include important design considerations to help improve part manufacturability, enhance cosmetic appearance, and reduce overall production time.

 

VIEW GUIDELINES >

RESOURCES

Digital Manufacturing for Dummies

Compare the various 3D printing , CNC machining, and injection molding technologies and learn how to leverage each process to get the products to market fast.

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Design Essentials for overmolding & insert Molding

We discuss how to design for over molding and insert molding processes, provide guiance on material compatibilty, and share how to add strength to parts with metal inserts.

Watch Webinar

Designing for Overmolding

Overmolding can be used to add a second molded part to an existing part, such as a grip, handle, or cover.

Read Design Tip

Design for Maufacturability

View an injection molding sample quote to experience BEPL quotes free analysis.

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Free moldability analysis within hours