And contains sulfur, phosphorus and nitrogen at the same time. As well as various types of hydraulic oils (liquids) for different purposes that should be 'used' with various types of compound additives such as antioxidants and rust prevention. Reasonable selection of seals and sealing materials, correct installation, use and maintenance of seals according to the system operating conditions and medium environment are the keys to obtaining effective sealing effects, reliability and service life.

At present, most of the sealing materials used at home and abroad are polymer elastomers, and plastics and various metals are also used under some special conditions. The formation of the sealing effect: dynamic sealing is divided into non-contact sealing and contact sealing. Or adopt the form of two or more materials composite or combined structure to exert their respective strengths to achieve a more comprehensive effect. Therefore, anti-wear agents are used in the hydraulic oil; in order to adapt to the hydraulic system near high-temperature heat sources and open flames, anti-wear agents are used.

The relative Non-standard Series Deep Groove Ball Bearings surfaces of the oil seal and the shaft move under the lubrication state where the oil film is separated, so the friction resistance and wear are small. No1 standard oil is 'low volume increase oil'. Compatibility of the sealing material and hydraulic oil (liquid): One of the sources of particle contamination of hydraulic oil is the 'debris' or 'wear debris' caused by the incompatible seal material and hydraulic oil. In the hydraulic system, the influence of hydraulic oil (liquid) on the sealing performance of the seal, except for the compatibility of the medium/seal material, the viscosity of the oil, the change of viscosity with temperature, the speed of reciprocating (rotating) movement, the pressure and the shaft and cylinder