O-Ring Materials - SBR, Buna® S

Styrene-butadiene rubber is a copolymer of styrene and butadiene. Its physical structure properties, processing properties and product uses are similar to natural rubber. It is the most widely used synthetic rubber.

Material properties:
● High elasticity, high strength and good wear resistance.
● It has poor oil resistance and is prone to aging and deterioration due to the double bonds in its main chain. It is not suitable for use outdoors, in UV, oxygen and ozone environments.

Applicable industries:
● Tires, anti-vibration rubber, hoses, conveyor belts and footwear industries.

Best● Better○ Good△ BadX

Rubber type (ASTM Abbreviation )			Styrene Butadiene Rubber SBR, Buna® S
Chemical structure			Copolymer of butadiene and styrene
Main feature			Wear-resistant, aging-resistant, water-resistant, low-cost, not easy to deform at high hardness, not resistant to strong acids, ozone, oils, greases and greases and hydrocarbons.
Pure rubber properties		proportion Muni viscosity ML1+ (100℃)	0.93 ∼ 0.94 30 ∼ 60
Physical properties of synthetic rubber		Possible JIS hardness range General temperature range(℃) Special temperature range(℃) Tensile strength (kg/cm2) Elongation (%) Anti-elastic Cracking Wear resistance Bending resistance	40 ∼ 90 -30 ∼ 80 -40 ∼ 100 50 ∼ 200 600 ∼ 100 ○ △ ● ○
Various properties of synthetic rubber	lubricating oil	Engine oil Gear Oil Motor oil Shaft lubricant Refrigeration oil Butter Lithium oil Oyster sauce	X X X X X X X ●
	Working oil	Pot shaft oil Oil + Water emulsion system Water + Glycol Phosphate ester Si Brake Fluid Gear oil	X △ ○ X ● ● X
	Fuel oil	Light oil、kerosene Heavy oil Gasoline	X X X
	Water	Water、Warm water Water vapor、Hot water Antifreeze water Water cutting oil	● ○ △ △
	Drug	Hydrochloric acid 20% Sulfuric acid 30% Nitric acid 10% Caustic soda 30% Benzene Trichloroethylene Alcohol Vinyl glycerol Liquid fat Alcohol Ether Ketone (MEK) Acetic acid、Ethyl ester	○ ○ X ● X X ● ● X X ● △ ~ ○ X ~ △
	Gas	LPG Urban gas Ozone Freon 12 Freon 22	X X X ○ ○
	Other	Food Sanitation Law Vacuum、Atmosphere 10mm kg 10-4 ~ 10-9
The main purpose			Automobile tires, shoes, tapes, sporting goods, floor tiles, tapes, conveyor belts.