EPDM is the acronym for ethylene propylene diene monomer rubber. 

synthetic rubber is sometimes blended with other materials and is often used in areas requiring higher performance physical properties with respect to heat, ozone, and weather resistance.

EPDM is made from ethylene, propylene, and a diene comonomer that enables crosslinking via sulfur vulcanization.

Available in typically 1 mm to 50 mm thick rolls or block for closed cell foam, and available in typically 3 mm to 80 mm thick rolls or block for open cell foam.Plates and cut / pressed components in both simple and adhesive. Which is better open cell or closed cell foam?

Silicone sheet membranes are used for vacuum forming Solid Surfaces, thermoplastics and similar composite materials. Thanks to their high temperature resistance and elasticity, silicone membranes have proven suitable for hot press and thermoforming applications.