Transfer Injection: The heated mold is closed in a press and the rubber injected by a hydraulic cylinder through a feed hole in the cavity.

The cylinder can either be incorporated in the press or sometimes in the mold. Provision must be made for air to escape from the cavity as the rubber enters, and the feeding method chosen to suit the operational requirements of the part. This method of molding can produce high-precision parts in moderate quantities without high tooling costs.