| COMPOUND |
SOG CODE |
ADVANTAGES |
LIMITATIONS |
|
Nitrile
Rubber
(NBR)
|
N |
|
*
|
Good oil and fuel resistance.
|
|
*
|
Good heat resistance up to 120oC in oil.
|
|
*
|
High tensile strength.
|
|
*
|
Low swelling in water.
|
|
|
*
|
Poor weather and ozone resistance.
|
|
*
|
Poor resistance against polar fluids.
|
|
*
|
Poor resistance against chlorinated hydrocarbon.
|
|
*
|
Poor resistance against aromatic fluids.
|
|
Polyacrylate
Rubber
(ACM) |
P |
| * |
Good oil and fuels resistance. |
| * |
Good heat resistance p to 150oC in oil. |
| * |
Good weater and ozone resistance. |
|
|
*
|
Not usable in contact with water and water solutions
|
|
*
|
Limited cold flexibility.
|
|
*
|
Limited tensile strength and tear resistance.
|
|
*
|
Poor wear resistance.
|
|
*
|
Poor resistance against polar and aromatic and chlorinated hydrocarbons.
|
|
Silicone
Rubber |
S |
|
*
|
Good heat resistance up to 180oC.
|
|
*
|
Best heat resistance of all rubber types.
|
|
*
|
Excellent low temp. Resistance of all rubber types.
|
|
*
|
Excellent weather and ozone resistance.
|
|
|
*
|
Poor tensile and tear strength.
|
|
*
|
Poor wear resistance.
|
|
*
|
Sensitive to hydrolysis.
|
|
*
|
Poor resistance against aromatic oils and oxidized mineral oils.
|
|
*
|
Poor diffusion resistance.
|
|
| Urethane |
U |
|
*
|
Good heat resistance up to 200oC
|
|
*
|
Good solvent and ozone resistance.
|
|
|
*
|
Poor comression set tends to soften above 250oC and in hot water.
|
|
Fluorinated
FPM |
V |
|
*
|
Good heat resistance up to 200oC
|
|
*
|
The resistance against oil and fuels is better than other types.
|
|
*
|
The only highly elastic rubber whice is resistant to aromatic and chlorinated hydrocarbons.
|
|
*
|
Excellent heat resistance.
|
|
*
|
Excellent weather and ozone resistance.
|
|
*
|
Excellent acid resistance.
|
|
*
|
Low swelling in water.
|
|
|
*
|
Limited cold flexibliity.
|
|
*
|
Limited tensile and tear strength.
|
|
*
|
Limited wear resistance.
|
|
*
|
High compression set in hot water.
|
|
*
|
Poor resistance to p
|
|