| Material |
NBR: Nitrile
|
NR: Natural Rubber
|
VMQ: Silicone
|
|
Description
|
Resistant to attack from mineral oils, petroleum solvents, fair resistance to heat and ageing. Relatively poor cold resistance. Cannot be used where weather resistance is required.
|
Good low temperature properties and long flex life. High resilience, elongation and tensile strength with wide hardness range. Poor resistance to ozone, heat, oil and general weathering.
|
Excellent electrical properties, resistant to very high temperatures and flexible to very low temperatures. Poor tensile and abrasion resistance compared to other elastomers.
|
|
Hardness: Shore A (Hint)
|
35 - 90
|
30 - 90
|
30-85
|
|
Tensile Strength (1000psi)
|
1.0 - 3.5
|
3.5 - 4.5
|
1.5
|
|
Tear Resistance
|
Good
|
Excellent
|
Fair
|
|
Impact Resistance
|
Good
|
Excellent
|
Poor
|
|
Compression Set (Method B, %)
|
5 - 20
|
10 - 30
|
10
|
|
Electrical Resistance (ohms/cm2)
|
3.5*1010 - 2*1011
|
1*1015
|
1*1014 - 1*1016
|
|
Low Temperature (°C)
|
-40
|
-50
|
-100
|
|
High Temperature (°C)
|
125
|
80
|
250
|
|
Intermittent High (°C)
|
150
|
100
|
275
|
|
Ozone (protected)
|
Fair
|
Fair
|
Excellent
|
|
Weather and Sunlight
|
Fair
|
Good
|
Excellent
|
|
Gas Permeation
|
Good
|
Fair
|
Fair
|
|
Water
|
Fair
|
Good
|
Excellent
|
|
Acid/Base - dilute
|
Good
|
Good
|
Excellent
|
|
Acid/Base - concentrated
|
Fair
|
Fair
|
Fair
|
|
Solvent - Aliphatic
|
Good
|
Poor
|
Poor
|
|
Solvent - Aromatic
|
Good
|
Poor
|
Poor
|
|
Oils and Gasoline
|
Excellent
|
Poor
|
Poor
|
