O-ring is mainly used in fluid static application (For example, water, oil, air, chemicals solvent, chemicals, etc. ) . The temperature range is from -60 ℃ up to 220 ℃. The pressure in static application should be less than 20MPa, which varies with different materials. Sometimes O-ring is used in dynamic application with the pressure less than 5MPa and also used in semi-conductor vacuum seal.