Properties
of rubber type

VAMAC

Silicone rubber

Viton

Material designation

GE

---

HK

FFKM

Tensile strength

non black filled

---

10.3

12.4

carbon black filled

17.2

10.3

13.8

Hardness range

40-95

40-85

55-95

Spec. gravity

1.08-1.12

1.14-2.05

1.85

Adhesion to metals

very good to excellent

excellent

moderate to good

Adhesion to fabrics

good

excellent

good to excellent

Tear strength

good

slight

moderate

Abrasion resistance

good

slight

good

Compression set

good

moderate

moderate to good (excellent at high temp.)

Rebound resilience

at room temperature

slight

excellent

moderate to good

in the warmth

moderate

excellent

good (excellent at high temp.)

Dielectric properties

good

good

good

Electr. insulating resistance

moderate to good

excellent

moderate to good

Gas permeability

very low

quite low

very low

Resistance to acids

diluted

good

excellent

excellent

concentrated

slight

moderate

excellent

Resistance to solvents

aliphatic hydrocarbons

good

slight

excellent

aromatic hydrocarbons

moderate

slight

excellent

oxygenous solvents

slight

moderate

slight

paint solvents

slight

slight

slight to moderate

Resistance to:

lubricating oils

good

moderate

excellent

mineral oil and fuels

good

moderate

excellent

animal and vegetable oils

good

good to excellent

excellent

water absorption

very good to 100° C

excellent

very good

oxidation

outstanding

excellent

outstanding

ozone

outstanding

excellent

outstanding

sunlight

outstanding

excellent

outstanding

thermal ageing

165° C

235° C

205° C

effects of flames

slight

moderate to good

excellent

high temperatures

excellent

outstanding

outstanding

exposure to cold

good

outstanding

good