Photo: Electrical Connector, Black FKM overmolded on copper

Not every automotive seal can be made from rubber alone. As vehicle and industrial systems become more compact and complex, many gasket applications require both structural support and reliable sealing performance. That’s where overmolding comes in.

Overmolding is the process of bonding multiple materials—typically rubber, plastic, and/or metal—into a single integrated component. The result is a gasket or seal that combines rigidity, dimensional stability, and flexibility in one part.

In many applications, a stamped metal carrier provides strength and alignment, while molded rubber creates the sealing interface. The metal insert is precisely loaded into the mold, then elastomer is molded and bonded to it—either mechanically, chemically, or both. The result is a durable, vibration-resistant seal designed for long-term performance in demanding environments.

Similarly, plastic carriers offer lightweight structural support and tight dimensional control. After the carrier is molded—sometimes over metal inserts—rubber or Liquid Silicone Rubber (LSR) can be overmolded to create the final sealing features. These multi-material designs reduce assembly steps, improve consistency, and optimize cost.

Scroll to view product photos of our metal and plastic overmolded gaskets produced using precision overmolding processes.