... vacuum is concerned) into the sealed-house parts. Rubber sealing products have good elasticity, low permanent deformation, a ... in volume performance. Products: O-rings, washers, gaskets, seal windows and doors, dust cover, cups, aprons, diaphragms, oil ... and so on. And the materials are: natural rubber, styrene butadiene rubber, nitrile rubber, neoprene, EPDM rubber, silicone rubber, fluorine rubber.