Full definition
A rubber molding process that combines elements of compression and injection molding: uncured rubber is loaded into a transfer pot (chamber above the mold), then a piston forces the rubber through sprues into closed mold cavities under pressure. The closed mold eliminates the flash problem of compression molding, while the simpler tooling avoids the cost of full injection molding equipment. Transfer pressure: 50-200 bar. Temperature: 150-180°C. Advantages over compression molding: better dimensional control, less flash, ability to mold around metal inserts (rubber flows into pre-loaded cavities without disturbing inserts), and better suited for complex geometries with thin walls. Advantages over injection molding: lower tooling cost, simpler machinery, easier for small to medium volumes. Disadvantages: material waste in the transfer pot and sprues (pad waste), slightly longer cycles than injection. Applications: rubber-bonded-to-metal parts (bushings, mounts), multi-cavity seal production, parts with metal inserts, and complex shapes where compression molding gives excessive flash. Per standard rubber molding practice. Press types: integral pot (built into mold) or plunger-type.