General Properties of Vulcanized Rubber

Rubber type (ASTM abbreviation)		Natural rubber (NR)	Chloroprene rubber (CR)	Acrylonitrile butadiene rubber (NBR)	Urethane rubber (U)
Mechanical properties	Hardness〔JIS Hs〕	10 ～ 100	10 ～ 90	15 ～ 100	10 ～ 100
	Tensile strength〔MPa〕	3 ～ 29	5 ～ 25	5 ～ 25	20 ～ 44
	Elongation〔％〕	100 ～ 1000	100 ～ 1000	100 ～ 800	300 ～ 800
	Impact resilience	◎	◎	○	◎
	Tear strength	◎	○	○	◎
	Compression set	◎	◎	◎	◎
	Abrasion resistance	◎	◎～○	◎	◎
	Flex cracking resistance	◎	○	○	◎
Physical properties	Heat resistance (highest operating temperature ℃)	90	130	130	80
	Cold resistance (brittle temperature ℃)	ー70	ー55	ー40	ー60
	Aging resistance	○	◎	○	○
	Ozone resistance	×	○	×	◎
	Light (weather) resistance	○	◎	○	◎
	Flame resistance	×	○	△～×	△～×
	Gas permeability (ability to prevent the passage of gas)	○	○	○	○
	Radiation resistance	○～△	○～△	○～×	○
Oil and chemical resistance	Gasoline and light oil	×	○	◎	◎
	Benzene and toluene	×	×	△～×	△～×
	Trichlene	×	×	×	×
	Alcohol	◎	◎	◎	◎
	Ethyl acetate	○～△	○～△	×	×
	Strong acid	△	○	○	×
	弱酸	○	◎	○	△
	Weak acid	○	◎	○	×
	Strong alkali	○	◎	○	×
Main features		Has the most typical rubber elasticity and is excellent in mechanical properties.	Has average features such as weather resistance, ozone resistance, heat resistance, and chemical resistance.	Good at oil resistance, abrasion resistance, and aging resistance.	Has particularly excellent mechanical properties.

Remark　◎ : Very good　○ : Good　△ : Acceptable　× : Unacceptable

Hole-Drilling , Tolerances , Fitting