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Nitrile rubber (NBR, Buna-N) provides excellent resistance to petroleum oils as well as mineral and vegetable oil.Nitrile rubber also offers strong resistance to heat aging - often a key advantage over natural rubber.Nitrile rubber performs well in carburetor and fuel pump diaphragms,aircraft hoses,seals and gaskets as well as oil-lined tubing.Due to its versatility,nitrile is used in applications involving not only oil and fuel resistance,but those applications requiring resistance to heat,abrasion,water,and gas permeability.
Silicon Rubber Features:
Silicone rubber offers great resistance in extreme temperatures,being able to operate normally from -100°C to +250°C (-150°F to +480°F).At extreme temperatures,the tensile strength,elongation,tear strength and compression set can be far superior to conventional rubbers.this makes it one of the materials of choice in many extreme environments.
Caution:Generally,silicones are attacked by most concentrated solvents,oils,acids and dilute sodium hydroxide.
FKM Rubber Features:
Viton belongs to the Fluoroelastomers (FKM/FPM) group of rubber compounds.there are many grades and hardness variations to solve most applications with various formulations to meet specific requirements of temperature and chemical resistance.typical uses include:excellent heat resistance,good mechanical properties,good compression set resistance,resistance to wide range  of oils and fuels,resistance to solvents; especially all aliphatic, aromatic and halogenated  hydrocarbons and acids.
EPDM Rubber Features:
EPDM rubber is a high density rubber primarily used for outdoor applications.It has dynamic and mechanical properties between natural rubber and synthetic rubber.Do not use EPDM if continual contact with petroleum based products is required.
Not recommended for usage in food applications or those that are exposed to aromatic hydrocarbons.

O ring seals applications:
Product scope: Electrical Appliance, Hydraulic,Automobile, Furniture, Machinery, Electronic,  Household, Medical,Water industry, Food industry etc.
Solution:Oil seal, Air seal, Water-proof, Solvent resistant, Heating Resistant, Dust Free, shock  absorber, skid resistant, Decoration.