Durlon 7900 / 7925 / 7950
Durlon 7900/7925/7950 are economy grade general service sheets with NBR rubber binder for mild service in piping and equipment with applications in steam, hydrocarbons and refrigerants. An economical alternative when service ranges and applications are not severe.
- Aramid with NBR Rubber Binder
- Compressed Asbestos Free Gasket Material
- ASTM F104: F712120-A9B3E22K5L151M5
Warning: Durlon® gasket materials should never be recommended when both temperature and pressure are at the maximum listed. Properties and applications stated are typical. No applications should be undertaken by anyone without independent study and evaluation for suitability. Never use more than one gasket in one flange joint and never reuse a gasket. Improper use or gasket selection could cause property damage and/or serious injury. Data reported is a compilation of field testing, field service reports and/or in-house testing. While the utmost care has gone into publishing the information contained herein, we assume no responsibility for errors. Specifications and information contained in this flyer are subject to change without notice. This edition cancels and obsoletes all previous editions.
| Gasket Factors | 1/16″ | 1/8″ |
|---|---|---|
| m | 3.0 | 3.2 |
| Y, psi (MPa) | 3,346 (23.1) | 3,385 (23.3) |
| Gb, psi (MPa) | 497 (3.4) | 486 (3.4) |
| a | 0.226 | 0.276 |
| Gs, psi (MPa) | 3 (0.02) | 0.4 (0.003) |
Anti-Stick Properties:
Much effort has gone into improving the anti-stick release agents of all compressed Durlon® products. All Durlon® compressed gasket materials have passed the MIL-G-24696B Navy Adhesion Test (366°F/48hrs).
| Colour 7900 7925 2950 | Off-white Lt-Green Blue |
| Fiber System | Aramid/Inorganic |
| Binder | NBR |
| Temperature Min Max Continuous, Max | -73°C (-100°F) 371°C (700°F) 260°C (500°F) |
| Pressure, Max, bar (psi) | 83 (1,200) |
| Density, g/cc (lbs/ft³) | 1.7 (106) |
| Compressibility, % ASTM F36 | 7-17 |
| Recovery, % ASTM F36 | 40 |
| Creep Relaxation, % ASTM F38 | 20 |
| Tensile Strength, across grain ASTM F152, MPa (psi) | 11 (1,600) |
| Fluid Resistance, ASTM F146 | |
| IRM 903 Oil 5hrs at 300°F | |
| Thickness Increase, % | 0-15 |
| Weight Increase, % | 15 |
| ASTM Fuel B 5hrs at 70°F | |
| Thickness Increase, % | 0-10 |
| Weight Increase, % | 12 |
| Sealability, cc/min ASTM F2378 (Nitrogen) | 0.05 |
| Sealability, ml/hr | |
| ASTM F37 (Fuel A) | 0.03 |
| ASTM F37 (Nitrogen) | 0.5 |
| Flexibility ASTM F147 | 10x |
Note: ASTM properties are based on 1/16” sheet thickness, except ASTM F38 which is based on 1/32” sheet thickness. This is a general guide only and should not be the sole means of accepting or rejecting this material. The data listed here falls within the normalrange of product properties, but should not be used to establish specifications limits nor used alone as the basis of design. For applications above Class 300, contact our technical department