A rubber gasket is a specific form of mechanical seal used to fill up spaces to keep liquids, gases and other contaminants from going where they are not supposed to go. They are most commonly used in industries where the fitting of mechanical parts in important such as in the car manufacturing industry. Gaskets may come in all sizes and shapes and be composed of a variety of materials each designed to perform sealing functions for very specific terms.

There are various types of rubber gaskets ranging from industrial rubber gaskets, high temperature rubber gaskets and heat resistant gaskets. Custom manufacturing of gaskets can be done in four ways: rubber molding, hand cut, water jet cut and die cut.

Rubber gaskets include flange gaskets, full face and ring gaskets, pump gaskets, diaphragms, gasket kits, handholes and manholes, insulator gaskets, spiral wound gaskets and jacketed gaskets. It also includes custom molded gasket shapes and extruded rubber gaskets. Lathe cut rubber and non-metallic gaskets can be made to order.

Some important considerations when searching for rubber gaskets and gasketing include maximum operating pressure, operating temperature and electromagnetic and radio frequency interference shielding.

Companies that specialize in rubber gaskets usually manufacture others types of industrial gaskets, neoprene gaskets, custom gaskets and die cut gaskets, oil resistant and flange gaskets, urethane gaskets and silicone gaskets. These gaskets can be sold at retail value, or they can be sold wholesale, usually for people who work professionally in the fields which use the rubber gaskets. Wholesale buying is an advantage, since bulk discounts lower the prices.