A rubber molded product is a product that is made by mixing a mixed rubber blank into a mold and pressed by a flat plate vulcanizer under specified conditions of time, pressure, and temperature, and is called a rubber molded product.

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O-rings in rubber molded products are widely used for sealing products of static and reciprocating parts, while oil seals are widely used for sealing of rotating shafts. O-rings and oil seals account for more than half of the total number of sealed products. The work of rubber molded sealing products is achieved through the contact between rubber and the seal. For example, the oil seal uses a small area of its lip to contact the rotating shaft surface under a certain pressure and realizes no oil leakage under the effect of fluid lubrication. O-ring is sealed by the compression force of the cross section, so it needs high elasticity, good oil resistance and aging resistance.