The most widely used synthetic rubber, appearing as a replacement for or in a mixture with natural rubber, mixed with sulphur

Better abrasion behaviour and better ageing resistance than NR. Tolerates higher temperatures than the latter for a short time.

Like NR, but less elastic, which results in a lower rebound elasticity and thus a stronger increase of temperature under dynamic stress. Also, worse notch impact strength. Combustible

Synthetic rubber, Neoprene®, Baypren®, generally not mixed with sulphur but rather with metal oxides.

Good resistance to heat, ageing, weathering. Does not burn in its own flame (self-extinguishing). High alternate bending fatigue strength. Moderate oil resistance, higher than NR, but lower than nitrile rubber. Good mechanical properties and elasticity, but not as good as NR. No lasting deformation.

Depending on the CR type, lesser or greater rigidification, possibly crystallization in lasting cold.

Synthetic rubbers, copolymers (EPM, peroxide cured) and terpolymers (EPDM, peroxide-cured or mixed with sulphur ) of ethylene propylene.

Outstanding resistance to weathering, ageing, ozone, chemicals, hot water and water vapour. Good resistance to polar liquids such as acetone, methanol etc., low water vapour permeability, good heat resistance, extremely low embrittlement temperature.

Low resistance to aliphatic and aromatic hydrocarbons (mineral oils, petrol, fuels). Combustible.

Synthetic rubber, vulcanisable with sulphur, but also with other systems.

Good weathering and ozone resistant, depending on mixture. Outstanding permeability to air and gases. Good behaviour at low temperatures Highly absorptive material for nonperiodic vibrations.

Low rebound elasticity, high lasting deformation. Not resistant to oils and fats. Combustible. IIR cannot be blended with other elastomers.