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This sheet is notable for its high resistance to petroleum based liquid fuels, lubricants and other petroleum based fluids.
The elastomer also has other excellent physical properties including good resistance to creep, tearing and abrasion.
Because this combination of qualities fits such a wide variety of gasket applications, this nitrile based compression sheet is second only to SBR rubber rubber based sheet packings in its breadth of use. It is black in colour.
AS 978 uses nitrile butadiene rubber (NBR), commonly called nitrile, oil resistance is its foremost quality. However it is also useful against such media as boiling water, ethylene glycol coolants, silicone fluids, aromatics and virtually all solvents except MEK and high aromatics
Nitrile based sheet packings are not recommended for ozone exposure, exposed outdoor applications, phosphate esters, ketones, brake fluids, strong acids or nitrocarbons.
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Operating Limits & Specifications |
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| Max Pressure Rating (psi) | 1000 |
| Max Temp. Limit (oF) | 700 |
| Max Contin. Temp. Limit (oF) | 500 |
| Max P x T | 350,000 |
| m value | 3.5 |
| y value (psi) | 2000 |
| ASTM F36 Compressibility (%) | 7-17 |
| ASTM F36 Recovery (% min) | 50 |
| ASTM F37 Sealability (ml/min) Sg=1000 psi=30 | 0.04 |
| BS 7531 Gas Leakage (ml/min) | <1.0 cc/min |
| ASTM F38 Creep Relaxation (%) | 27 |
| BS 7531 Residual Stress (mpa) | 23 |
| ASTM F146 Fuel B @ 70-85 F Thick. Increase (%) | 0 - 10 |
| IRM 903 @ 300 oF Thickness Increase (%) | 0 - 10 |
| ASTM Fuel B @ 70-85 oF Weight Increase (%) | 20 max. |
| ASTM F152 Average Tensile (psi) | 2100 |
| Density (g/cm3) | 2.00 |
| Rubber Binder | NBR |
| Colour | Black |