Properties
of rubber type

CPE

Nordel
EPDM

ECO

Material designation

BC, BE, CE

CA

CH

Tensile strength

non black filled

10.3

6.9

6.9

carbon black filled

17.2

20.7

20.7

Hardness range

60-90

40-90

40-90

Spec. gravity

1.16-1.32

0.86

1.36-1.27

Adhesion to metals

moderate to good

good to very good

moderate to good

Adhesion to fabrics

moderate

good

moderate to good

Tear strength

moderate

moderate to good

moderate to good

Abrasion resistance

good

good to very good

moderate to good

Compression set

good

good

slight

Rebound resilience

at room temperature

moderate

very good

good

in the warmth

good

very good

good

Dielectric properties

excellent

excellent

good

Electr. insulating resistance

good

excellent

good

Gas permeability

very low

quite low

low to quite low

Resistance to acids

diluted

excellent

excellent

moderate to good

concentrated

good

excellent

moderate

Resistance to solvents

aliphatic hydrocarbons

good

slight

excellent

aromatic hydrocarbons

moderate

slight

good

oxygenous solvents

moderate

good to very good

slight

paint solvents

moderate

slight to moderate

moderate

Resistance to:

lubricating oils

good

slight

excellent

mineral oil and fuels

good

slight

excellent

animal and vegetable oils

good

good

excellent

water absorption

very good

very good to excellent

good

oxidation

excellent

excellent

good

ozone

excellent

outstanding

excellent

sunlight

outstanding

outstanding

good

thermal ageing

120° C

145° C

135° C

effects of flames

good

slight

slight to moderate

high temperatures

good

excellent

very good

exposure to cold

very good

excellent

good to very good