O-Ring, Seal, Packing is suitable for most of the engineering requirements of the product, it is used for vibration, noise and vibration, sealing, corrosion resistance, wear resistance, friction resistance, electrical insulation and thermal water, shackles and other materials Bearings. The molding method takes into "hot type" and "injection" type two, because of the production machine, the amount of investment and the use of raw materials because the molding methods differ, the former and standards applicable to the shape of a small amount of product, the latter be more appropriate for large or special shapes. Rubber elongation up to 100% or more, although it is easily deformed under the applied external force, but will be restored immediately after the removal of external force to the prototype, can be clearly seen from flexible polymer material properties.
Commonly used materials:

Species,    Temperature,         General application
 
NBR         -40 ~ 120 ℃          commonly used in hydraulic, pneumatic system. 
 
FKM        -20 ~ 210 ℃           high temperature, mature oil, aromatic solvents, and a variety of chemicals and phosphate-containing chlorinated hydrocarbon fire resistant hydraulic fluids. 

EPDM      -30 ~ 150 ℃          steam-resistant, hot water, hot gases, weak acids, with phosphate flame-resistant hydraulic fluids, does not apply to mineral oil. 
VMQ        -40 ~ 210 ℃          high temperature, atmosphere and water. For static sealing, polyurethane PU -50 ~ 100 ℃ good heat resistance and hydrolysis resistance.
 
● NBR: NBR/-40 ~ 120 ℃ .. commonly used in hydraulic, pneumatic system.
● (half / full) fluorine rubber: FKM (Viton, Perfluoro) / -20 ~ 210 ℃ .. high temperature, mature oil, aromatic solvents, chemicals and a variety of phosphate esters and chlorinated hydrocarbons with flame-resistant hydraulic the oil.
● EPDM: EPDM/-30 ~ 150 ℃ .. resistant to steam, hot water, hot gases, weak acids, phosphate-containing anti-◎ Hydraulic Fluids, does not apply to mineral oil.
● Silicon rubber: VMQ (Silicon) / -40 ~ 210 ℃ .. temperature, atmosphere and water, for static sealing.
● Polyurethane: PU/-50 ~ 100 ℃ ... good heat resistance and hydrolysis resistance.

★ use "O-Ring, Seal, Packing oil / seal" Cautions:
1. "Brands" and "model"?
(2) use of the environment of the gas / liquid or chemicals (Chemical)?
3 of acid / base? Specify the material? Temperature?
4 Specifications / Dimensions (internal / external diameter * length)?
5 use level? (Purchase price)