General Properties of Vulcanized Rubber

2026/05/07

Types of Rubber (ASTM Designations)		Natural Rubber (NR)	Chloroprene Rubber (CR)	Acrylonitrile-Butadiene Rubber (NBR)	Urethane Rubber (U)
Mechanical Properties	Hardness [JIS Hs]	10 to 100	10 to 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
	Rebound elasticity	◎	◎	○	◎
	Tear strength	◎	○	○	◎
	Compressive set	◎	◎	◎	◎
	Abrasion resistance	◎	◎～○	◎	◎
	Flexural crack resistance	◎	○	○	◎
Physical Properties	Heat resistance (Max. operating temperature, °C)	90	130	130	80
	Cold resistance (embrittlement temperature, °C)	-70	-55	-40	-60
	Ageing resistance	○	◎	○	○
	Ozone resistance	×	○	×	◎
	Light (Weather) Resistance	○	◎	○	◎
	Flame resistance	×	○	△～×	△～×
	Gas Permeability (to a degree that prevents gas from passing through)	○	○	○	○
	Radiation resistance	○～△	○～△	○～×	○
Oil and chemical resistance	Gasoline and diesel	×	○	◎	◎
	Benzene, Toluene	×	×	△～×	△～×
	Trichloroethylene	×	×	×	×
	Alcohol	◎	◎	◎	◎
	Ethyl acetate	○～△	○～△	×	×
	Strong acids	△	○	○	×
	Weak acids	○	◎	○	△
	Strong alkali	○	◎	○	×
	Weak alkali	○	◎	○	×
Key Features		Possesses the most rubber-like elasticity and excellent mechanical properties	Possesses balanced properties such as weather resistance, ozone resistance, heat resistance, and chemical resistance	Good oil resistance, abrasion resistance, and aging resistance	Particularly excellent mechanical properties

Notes: ◎: Excellent, ○: Good, △: Fair, ×: Unacceptable