What is the difference between injection compression and transfer molding?

Injection compression molding and transfer molding are two widely used rubber molding processes for manufacturing high-performance rubber components.

Injection compression molding combines injection molding and compression molding. Rubber is injected into an open mold cavity, and the mold closes to uniformly compress the material before curing. This method improves consistency and reduces excess flash.

Transfer molding uses a transfer pot and plunger system. Pre-measured rubber is placed into the chamber and forced into closed mold cavities through runners and sprues, where it cures under heat and pressure.

Both processes are effective for producing precision rubber parts, but the best choice depends on part complexity, volume, and material requirements.