... parts still leaks, and prevent outside dust, sediment and air (for high vacuum is concerned) into the sealed-house parts. Rubber ... , small changes in volume performance. Products: O-rings, washers, gaskets, seal windows and doors, dust cover, cups, aprons, diaphragms, oil seals ... , air seals, and various sections of the ring, gasket and so on. And the materials are: natural rubber ...