There are many factors that affect the sealing performance of O-rings. Among them, pressure is an important factor affecting the quality of seals. The level of pressure and the length of pressure cycle changes have great effects on seal damage (such as extrusion). Impact. The higher the pressure, the greater the impact of other factors on the performance of the seal, such as temperature, speed, seal material, clearance between the piston and cylinder, and clearance between the piston and cylinder head. There is also temperature and friction. It is difficult to describe the maximum use temperature and minimum use temperature of a seal material, because it is the result of the combined effect of a series of factors. For the different working temperatures of the piston and the piston rod, they should be selected differently.
Another is the surface roughness of the seal product, the characteristics of the surface, the pressure, the medium, the temperature, the material of the seal, the type of the seal and the speed of movement, which are all factors that affect the O-ring. Experience has shown that the characteristics of the surface of the cylinder piston and piston rod have a very large impact on the life of the seal. These are the factors that affect the sealing performance of O-rings.
Rubber balls can be made of rubber materials with different properties. Let's analyze the characteristics of this! fluororubber. A synthetic rubber stopper containing fluorine atoms in its molecular structure. It is usually expressed by the number of fluorine atoms of fluorine-containing units in the copolymer, such as fluororubber 23, which is a copolymer of vinylidene fluoride and chlorotrifluoroethylene. Fluorine rubber is resistant to high temperature, oil and chemical corrosion. Nitrile rubber. Abbreviated as NBR, it is obtained by the copolymerization of butadiene and acrylonitrile. It has good oil resistance and aging resistance, and can be used for a long time in air at 120°C or in oil at 150°C.
In addition, it also has water resistance, air tightness and excellent bonding properties. Neoprene. Referred to as CR, it is obtained by the polymerization of chloroprene. It has good comprehensive performance, oil resistance, flame resistance, oxidation resistance and ozone resistance. However, its density is high, it is easy to crystallize and harden at room temperature, its storage property is not good, and its cold resistance is poor. Polysulfide rubber. It is formed by polycondensation of dihaloalkanes and alkali metals or alkaline earth metals. It has excellent oil resistance and solvent resistance, but the strength is not high, the aging resistance and processability are not good, and it has a bad smell. It is often used in combination with nitrile rubber. These are the characteristics of different rubber balls!