Durlon® DuraSwell™ 7760

A gasket material for demanding applications that require excellent sealability, conformity to flange surfaces and recovery. Durlon® 7760 is designed to swell when in contact with oils and fuels. This helps increase the gasket stress for applications that require increased gasket loading that may previously be limited, due to insufficient bolting or flange constraints.

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DuraSwell was engineered for demanding applications that require superior sealability, conformity to flange surfaces, and recovery. This gasket material is designed to react by a controlled swell when in contact with oils and fuels. This swelling property helps increase gasket stress in applications that require increased gasket loading that may have otherwise been limited due to insufficient bolting or flange design factors. Applications include fuel systems, pulp and paper tall oils, oils, coolants and heavy duty equipment applications such as oil pan covers, gear case and flywheel housings.
Durlon® 7760 contains high-strength synthetic fibres bonded with high-grade nitrile (NBR) rubber.
Color Off-White
Fiber System Synthetic
Proprietary SBR Blend SBR Blend
Temp. Min.
Temp. Max.
Continuous, Max
-73°C (-100°F)
344°C (650°F)
205°C (400°F)
Pressure, max, bar (psi)
Continuous, bar (psi)
69 (1,000)
34.5 (500)
Density, g/cc (lbs/ft3) 1.65 (103)
Compressibility, % 7-17
Recovery, % 50
Creep Relaxation, % <30
Tensile Strength, MPa (psi) 14.8 (2,100)
Nitrogen Sealability, ASTM 2378 0.01 cc/min
Fluid Resistance, ASTM F146 IRM 903 Oil 5hrs at 300°F
Thickness Increase, %
Weight Increase, %
<75
<50
Fluid Resistance, ASTM Fuel B 5hrs at 70°F
Thickness Increase, %
Weight Increase, %
15-30
<30
Flexibility, ASTM F147 4x

Note: ASTM properties 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 normal range of product properties but should not be used to establish specification limits nor used alone as the basis of design.

*For applications above Class 300, consult your representative.

RoHS Reach Declaration Compliant
1/16”
m 6.9
Y psi (MPa) 2,412 (16.6)
Gb psi (MPa) 95 (0.655)
a 0.609
Gs psi (MPa) 4 (0.027)