What are the conditions for rubber O-rings to be qualified?

The use of rubber O-rings is very wide, and its working environment is also complex and diverse, which requires its rubber material to have some special properties. In the hydraulic system, it is necessary to have good oil resistance, temperature resistance, low compression permanent deformation and a certain tensile strength. As a dynamic seal, in addition to having requirements, the compound should also have good wear resistance and tear resistance. The sealing of special media requires small changes in the volume and hardness of the adhesive in the medium.
Rubber O-ring is suitable for installation on a variety of mechanical equipment, in the specified temperature, pressure, and different liquid and gas media, in the static or moving state of the seal. In sanitary ware, ships, automobiles, hardware, electronics, toys, electrical appliances, aerospace equipment, machinery, and all kinds of instruments and meters, a large number of types of sealing components. The rubber O-ring is mainly used for static sealing and reciprocating sealing. When used for rotary motion seals, limited to low speed rotary seals. The rubber O-ring is generally installed in the groove of the outer circle or the inner circle with a rectangular cross section. Rubber O-type sealing ring in oil, acid, alkali, grinding, chemical erosion and other environments still play a good sealing, shock absorption role. Therefore, the rubber O-ring is the most widely used seal in hydraulic and pneumatic transmission systems.
Under normal circumstances, the rubber formula is composed of raw rubber, vulcanized antioxidant reinforcing agent system, protection system, reinforcing system and softening system. The purpose of formulation design is to seek the best combination of various matching components, so as to obtain good comprehensive performance. A qualified rubber O-ring must meet these conditions:
1, must first meet the seal performance requirements.
2, the second rubber processing technology performance should be good.
3, and in the premise of ensuring product quality as far as possible to choose cheap, rich sources, non-toxic or low toxicity, stable performance of raw materials.