Durlon 8500 Aramid-Inorganic/NBR

Durlon 8500 is a high performance compressed gasket material for use in process industries including pulp and paper, food and beverage, pharmaceutical, hydrocarbon, chemical, refinery and general industry. Durlon® 8500 is suitable for oils, water, steam, new generation refrigerants, dilute acids and alkalis and many other liquids and gases.

  • Aramid/Inorganic Fibre with NBR Rubber Binder
  • Compressed Asbestos Free Gasket Material
  • ASTM F104: F712120-A9B3E12K5L151M6

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 2.7 4.2
Y, psi (MPa) 2,359 (16.3) 2,931 (20.2)
Gb, psi (MPa) 650 (4.5) 400 (2.8)
a 0.330 0.350
Gs, psi (MPa) 200 (1.4) 20 (0.1)

Fire Testing:

Durlon® 8500 has successfully passed a modified version of the API 607 fire test (1,200°F, 30mins, 30 psig, 100 ml/min maximum allowable leakage).

Colour Green
Fiber System Aramid/Inorganic
Binder NBR
Continuous, Max
-73°C (-100°F)
371°C (700°F)
287°C (548°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 20
Tensile Strength, across grain ASTM F152, MPa (psi) 13.8 (2,000)
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, % 10
ASTM F37 (Fuel A), ml/hr 0.01
ASTM F37 (Nitrogen), ml/hr 0.4
ASTM F2378 (Nitrogen, cc/min) 0.03
Volume Resistivity, ohm-cm ASTM D257 4.2 x 1013
Dielectric Breakdown ASTM D149, kV/mm (V/mil) 11.7 (297)
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 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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