Durlon® 7900/7925/7950 Aramid/NBR


Application:

An economy grade general service compressed sheet with NBR rubber binder for mild service in piping and equipment and OEM applications in steam, hydrocarbons and refrigerants. An economical alternative when service ranges and applications are not severe.

Composition:

DURLON® 7900, 7925 and 7950 contain high-strength aramid fibres bonded with high-grade nitrile (NBR) rubber.

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/48 hrs).

 Typical Physical Properties:

Colour7900 – Off-White
7925 – Light Green
7950 – Blue
Fibre SystemAramid-Inorganic
BinderNBR
Temperature
Min
Max
Max, continuous
-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 F 146,
IRM 903 Oil 5 hours at 149°C (300°F)
Thickness Increase, %
Weight Increase, %
ASTM Fuel B 5 hours at 21°C (70°F)
Thickness Increase, %
Weight Increase, %
0-15
15 0-10 12
Sealability , cc/min
ASTM F2378 (Nitrogen)
Sealability, ml/hr
ASTM F37 (Feul A)
ASTM F37 (Nitrogen)
0.05 0.03
0.5
Gasket Factors
m
Y, psi
Gb, psi
a
Gs, psi
1/16” 1/8″
3.0 3.2
3,347 (23.1) 3,385 (23.3)
497 (3.4) 486 (3.4)
0.226 0.276
3 (0.02) 0.4 (0.003)
Flexibility,
ASTM F147
10x