Durlon 8400 Phenolic/NBR

Durlon 8400 can be used in process piping and equipment in chemical, pulp and paper and other general industrial applications. With an extremely wide pH application range (2-13 at room temp). A unique high-performance compressed sheet, Durlon® 8400 is an excellent gasket material for use in steam, mild caustics and acids in Class 150 and 300 services.

  • Phenolic Fibre with NBR Rubber Binder
  • Compressed Asbestos Free Gasket Material
  • ASTM F104: F712120-A9B4E22K5L911M5

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 2.9 4.5
Y, psi (MPa) 2,410 (16.6) 3,967 (27.4)
Gb, psi (MPa) 2000 (13.8) 1,076 (7.4)
a 0.194 0.289
Gs, psi (MPa) 340 (2.3) 94 (0.7)

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 Gold
Fiber System Phenolic
Binder NBR
Continuous, Max
-73°C (-100°F)
427°C (800°F)
290°C (554°F)
Pressure, Max, bar (psi) 103 (1,500)
Density, g/cc (lbs/ft³) 1.7 (106)
Compressibility, % ASTM F36 8-16
Recovery, % ASTM F36 50
Creep Relaxation, % ASTM F38 25
Tensile Strength, across grain ASTM F152, MPa (psi) 12.4 (1,800)
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, % 15
ASTM F37 (Fuel A), ml/hr 0.01
ASTM F37 (Nitrogen), ml/hr 0.3
ASTM F2378 (Nitrogen, cc/min) 0.03
Volume Resistivity, ohm-cm ASTM D257 3.1 x 1013
Dielectric Breakdown ASTM D149, kV/mm (V/mil) 14.6 (371)
Flexibility ASTM F147 8x

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 normal range 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

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