Our standard lip material is NBR70 nitrile rubber. This is the default elastomer if no other materials are labeled.
= NBR is a durable, general purpose material
-V = Viton or floro-elastomer can be used in high heat applications and is more durable than NBR.
-S = Silicone is well suited for very low to very high temperature applications or for low friction applications.
-P = Polyacrylate can be used with extreme pressure lubricants at a higher temperature than NBR.
Examples:
SE825-950-57SB is made with NBR70 nitrile rubber.
SE225-300-37SB-V is made with viton.
Please see the table below for the physical properties of these lip materials.
| Resistance or Physical Property | Nitrite | Silicone | Viton | Polyacrylate |
|---|---|---|---|---|
| ASTM Designation 0141B | NBR | SI | FPM | ACM |
| Temp. Range F | -50°F to 250°F | -20°F to 300°F | -80°F to 400°F | -30°F to 400°F |
| Temp. Range C | -45°C to 125°C | -30°C to 150°C | -60°C to 200°C | -35°C to 200°C |
| Enduro Code | -S | -V | -P | |
| Specific Gravity | 1.00 | 0.95 | 1.40-1.95 | 1.00-1.20 |
| Durometer Range, Shore A | 20-90 | 30-80 | 60-90 | 50-80 |
| Resilience | Good | Poor | Fair | Fair |
| Tensile Strength (reinforced) psi | 3500 | 900 | 2000 | 1500 |
| Elongation (reinforced) % | 350 | 200 | 200 | 200 |
| Hysteresis | Good | Excellent | Good | Good |
| Compression Set | Good | Excellent | Good | Excellent |
| Electrical resistance | Poor | Excelent | Good | Fair |
| Gas Impermeability | Good | Poor | Excellent | Fair |
| Impact | Fair | Fair | Good | Good |
| Abrasion | Excellent | Fair | Good | Fair |
| Tear | Good | Fair | Fair | Fair |
| Cut Growth | Good | Fair | Fair | Fair |
| Flame Resistance | Fair | Good | Excellent | Poor |
| Stiffening °C | +30 to -20 | -60 to -160 | +20 to -30 | +14 to -22 |
| Brittle Point °C | -65 | -90 to -180 | +10 to -60 | 0 to -44 |
| Weather | Good | Excellent | Excellent | Good |
| Oxidation | Fair | Excellent | Excellent | Good |
| Ozone | Poor | Excellent | Excellent | Excellent |
| Radiation | Fair | Excellent | Good | Fair |
| Water | Excellent | Good | Good | Fair |
| Acid | Good | Fair | Good | Fair |
| Alkali | Fair | Fair | Fair | Poor |
| Aliphatic Hydrocarbons (gasoline, kerosene, etc.) | Excellent | Good | Excellent | Excellent |
| Aromatic Hydrocarbons (benzene, toluene, etc.) | Good | Poor | Excellent | Fair |
| Halogenated Hydrocarbons (Fluorine, clorine, etc.) | Poor | Fair | Good | Poor |
| Alcohols | Excellent | Excellent | Excellent | Fair |
| Synthetic Lubricants (diester) | Fair | Fair | Good | Fair |
| Silicates | Good | Poor | Good | Good |
| Phospates | Poor | Good | Poor | Poor |