|
Material
|
Main
Characteristics
|
Recommended
Temperature Range in Air
|
Range
Shore Hardness
|
| NATURAL
RUBBER |
Excellent
strength, wear and resistance but modest air and exposure ageing qualities.
Poor resistance to oils and hydrocarbons. |
- 25º + 70º
|
30º - 90º
|
| STYRENE
BUTADIENE S.B.R. |
As
Natural |
- 25º + 70º
|
30º - 90º
|
| POLYCLOROPRENE
NEOPRENE CR |
Very
good air and exposure ageing strength and abrasion qualities but limited
oil and hydrocarbon resistance. |
- 20º + 90º
|
30º - 90º
|
| NITRILE
WBR |
Good
strength, abrasion, resilience and heat resistance but poor exposure
characteristics. Excellent resistance to oils and hydrocarbons but not
to esters and ketones. |
- 20º + 90º
|
30º - 80º
|
| BUTYL
IIR |
Excellent
strength air exposure, heat ageing qualities combined with wide chemical
resistance. Low resilience and resistance to oils and hydrocarbons. |
- 40º + 110º
|
30º - 80º
|
| ETHYLENE
PROPYLENE EPDM |
Excellent
air, exposure, resilience and good strength qualities. Resistant to
many chemicals, steam and reasonably so to oxygenated hydrocarbons such
as ketones and esters but not to oil and hydrocarbons. |
- 40º + 110º
|
30º - 90º
|
| SILICON
MVQ |
Extreme
operational temperature range, Excellent air ageing and exposure qualities.
Modest strength, oil and hydrocarbon resistance. Relatively expensive. |
- 80º + 240º
|
35º - 85º
|
| HYPALON |
Excellent
strength, heat and air ageing and chemical resistance qualities but
modest resistance to oils and hydrocarbons. |
- 20º + 90º
|
45º - 90º
|
| POLYURETHANE
AU |
Outstanding
strength resilience abrasion qualities with good exposure and oil resistance.
Less satisfactory for heat, hot water and acid resistance. |
- 20º + 70º
|
30º - 95º
|