Compression Molding is the process of molding a rubber part with high heat in a mold base cavity tool. A good analogy would be similar to the process of making waffles. Not as simple of course but for more information about the science behind it, here is a good read on Science Direct.u003cbr/u003eScience Direct: u003ca href=u0022https://www.sciencedirect.com/topics/engineering/compression-moldingu0022u003ecompression-moldingu003c/au003eu003cbr/u003ePopular items: seals, gaskets, O-rings, sound dampening parts, thermal conductive parts