1. O-ring specifications include UHSO-ring specifications, UHPO-ring specifications, UNO-ring specifications, DHO-ring specifications, piston rod O-ring specifications, high-temperature O-ring resistance, high-pressure O-ring resistance, and corrosion resistance O-ring, wear-resistant O-ring. 2. O-ring has excellent sealing performance and high working life. The working life of dynamic pressure sealing is 5-10 times longer than conventional rubber sealing products, up to several tens of times. Under certain conditions, it can have the same life as the sealing base. The O-ring has low friction resistance and equal dynamic and static friction. It is 1 / 2-1 / 4 of the friction force of the "0" rubber ring, which can eliminate the "crawl" phenomenon of low-speed and low-pressure movement. O-rings are highly abrasion-resistant and have automatic elastic compensation after the sealing surface wears. O-ring good self-lubricating performance. Can be used for oil-free lubrication seals. O-ring structure is simple and easy to install. O-ring working pressure: 0-300MPa; working speed: ≤15m / s; working temperature: -55-250 degrees. O-ring suitable medium: hydraulic oil, gas, water, mud, crude oil, emulsion, water-glycol, acid. Scope of application of O-ring: O-ring is suitable for being installed on a variety of machinery and equipment. It can play a role of sealing under static or moving state under the specified temperature, pressure, and different liquid and gas media. Various types of seals are widely used in machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, construction machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and various instruments element. O-rings are mainly used for static and reciprocating seals. When used for rotary motion seals, it is limited to low-speed rotary seals. The O-ring is generally installed in a groove with a rectangular cross-section on the outer or inner circle for sealing. O-ring seals still play a good role in sealing and damping in environments that are resistant to oil, acids, alkalis, abrasion, and chemical attack. Therefore, the O-ring is the most widely used seal in hydraulic and pneumatic transmission systems.