O-ring material selection

O-ring material selection mainly consider the following points: 1) O-ring working condition refers to the O-ring for static sealing, dynamic sealing or sliding sealing. 2) The working condition of the machine refers to the machine in continuous work or intermittent work, and consider the length of each intermittent time, whether there is shock load in the sealing part. 3) the working medium of the working media is a gas or a liquid and consider the physical and chemical properties. 4) the working pressure pressure, fluctuations and frequency, as well as the maximum instantaneous pressure. 5) the working temperature, including the instantaneous temperature and hot and cold alternating temperatures. 4）Working pressure pressure, fluctuation amplitude and frequency, and instantaneous maximum pressure, etc. 5）Working temperature, including instantaneous temperature and hot and cold alternating temperature. 6）Price and source.

Generally speaking, oil-resistant nitrile rubber, weather- and ozone-resistant neoprene rubber, heat-resistant acrylate rubber or fluoroelastomer, high-pressure and abrasion-resistant urethane rubber, and cold-resistant and at the same time oil-resistant copolymerised chlorohydrin rubber are used.

The scope of application of various rubber materials is detailed in the following table:

Material Applicable medium Temperature / ℃ Remarks Nitrile rubber for static movement Mineral oil, gasoline, benzene 80-30 ~ 120

Neoprene rubber air, water, oxygen 80-40 ~ 120 for sports should be noted that

Butyl rubber movable, vegetable oil, weak acid, alkali 80-30 ~ 110 permanent deformation, not applicable to mineral oil SBR alkali, movable, vegetable oil, air, water 80-30 ~ 100 not applicable to mineral oil

Natural rubber water, weak acid, weak alkali 60-30 ~ 90 not applicable to mineral oil

Silicone rubber High and low temperature oil, mineral oil, animal and vegetable oils, oxygen, weak acids, weak bases -60 ~ 260 -60 ~ 260 not applicable to steam, moving parts to avoid the use of chlorosulfonated polyethylene High temperature oil, oxygen, ozone 100-10 ~ 150 moving parts to avoid the use of

Polyurethane rubber Water, oil 60-30～80 Wear-resistant, but avoid high-speed use of fluorine rubber Hot oil, steam, air, inorganic acids, halogenated solvents 150-20～200

Polytetrafluoroethylene Acid, alkali, various solvents

-100～260 Not applicable to sports parts