Transfer Molding, Compression Molding, Rubber Injection Molding or Liquid Silicone Injection Molding? Which is right to your silicone rubber projects. Compression molding is a economical and simple rubber molding, which designed to place blocky-shape rubber materials (granular & pelletized shape) in mold chambers & cavities to be molded by heat and pressure. Compression molded manufacturing process like making waffles & cake mold. Rubber Transfer Molding Design is similar to rubber compression molding, but there is a pot on the top plate and a ram above the pot. This mold pot is used to contain pre-measured rubber raw material and transfer it to the cavities through pot runner and spruced.