Home > Service > Insert Molding
insert molding process

What Is Insert Molding

Insert molding refers to pre-installing the insert in the mold and injecting resin. The molten resin is combined with the insert to melt. The insert is usually metal, and the injected plastic material is typically rigid plastic. During the molding process, the insert usually needs to be preheated so that its surface temperature is close to the melting point of the cover material for optimal bonding.

Insert Molding Process

  1. Preparation of Inserts: Metal or plastic inserts are cleaned and prepared for molding.
  2. Insert Placement: Inserts are placed into the mold cavity, either manually or automatically.
  3. Injection and Molding: Molten plastic is injected into the mold, encapsulating the inserts and forming the final part.

Insert Molding Material

Injection Molding Materials

The molding material or the resin is chosen based on the mold. We offer the following materials for insert molding.

  • Polypropylene (PP)
  • Polyamides/Nylon (PA)
  • Polycarbonate (PC)
  • Acrylonitrile Butadiene Styrene (ABS)
  • Polyethylene (PE)
  • Polyurethane (PU)
  • Natural Rubber (NR)

Available Insert Types

We offer various types of inserts for insert molded components. Metal inserts in plastic molding are typically made of brass, stainless steel, or standard steel.

  • Custom insert for special needs
  • Screws and threaded fastener
  • Electronics component
  • Bearing and bushing
  • Magnet
  • Clip, pin, spring, and rivets

Why Choose Us

Contract Manufacturing Solution

FAQs of Insert Molding

How does insert molding compare to overmolding?

Insert molding integrates metal or plastic inserts into a plastic part during molding to enhance strength and functionality.

Overmolding covers a substrate with a plastic material to improve aesthetics, comfort, or functionality. Both methods reduce assembly and improve part performance.

  • Manual Loading: Suitable for low-volume production, where an operator places the inserts into the mold.
  • Automatic Loading: Used for high-volume production, where robotics can place inserts quickly and accurately, reducing labor costs and increasing efficiency
Scroll to Top