Durlon ® 9000

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Inorganic Filler with Pure PTFE Resins. Filled PTFE Gasket

ASTM F104: F452111-A9B5E11K6M6

Equivalent to NES 5420 / Teadit ###

DURLON® 9000/9000N is used extensively in chemical, pulp and paper, food and beverage and the railroad tankcar industries.  It has been tested and approved for liquid chlorine, caustics, liquid oxygen, and high purity applications in the pharmaceutical industry (9000N, blood components manufacturing).  DURLON® 9000 and 9000N are designed for applications where resistance to highly aggressive chemicals is required. Available in unpigmented white as style 9000N. Both styles 9000 and 9000N, (including branding) conform to FDA requirements.

DURLON 9000 has been proven through the "Test Protocol" of the Chlorine Institute and is listed as an acceptable gasket material for Dry Chlorine service (both liquid and gaseous) in Pamphlet 95, Edition 2 of the Chlorine Institute.   Additionally, DURLON 9000 was independently tested and approved for Caustics service by a major chemical/chlorine manufacturer. Unlike generic glass fiber filled PTFE, the shape of the fillers used in DURLON 9000 do not allow wicking which can cause corrosion on flange faces.

DURLON 9000/9000N has been independently certified for service in Oxygen at pressures up to 585 psi (40 bar) and temperatures up to 392°F (200ºC), and for service in liquid oxygen. Gaskets for oxygen service can be supplied from distributor stocks, providing proper cleaning procedures for oxygen service are followed before installation.

Various shapes of inorganic fillers have been homogeneously blended with pure PTFE resins to give DURLON® 9000 its physical and mechanical properties. It is suitable for use in steel flanges and will not exhibit the cold flow problems associated with virgin PTFE or the hardness problems of some other filled PTFE products. It cuts easily and separates cleanly from flanges after use.


Available Sheet Sizes:

Nominal Thickness
Sheets Sizes
Order Code - 9000
Order Code - 9000n Weight / Sheet lbs (kg)
Inches mm
1/64" (0.5 mm) 60 x 60 1524 x 1600 TB05-060-060 TN05-060-060 4 (2)
1/32" (0.8mm) 60 x 60 1524 x 1600 TB08-060-060 TN08-060-060 9 (4)
1/16" (3.0 mm) 60 x 60 1524 x 1600 TB15-060-060 TN15-060-060 18 (8)
2.0 mm 60 x 60 1524 x 1600 TB20-060-060 TN20-060-060 24 (11)
3/32" (2.5 mm) 60 x 60 1524 x 1600 TB25-060-060 TN25-060-060 27 (12)
1/8" (3.0 mm) 60 x 60 1524 x 1600 TB30-060-060 TN30-060-060 36 (16)
3/16" (5.0 mm) 60 x 60 1524 x 1600 TB50-060-060 TN50-060-060 54 (24)

Note: 1mm thickness or, 60" x 120" (1.5m x 3m) sheet sizes available on special order, other custom lengths available on request.

Warning: Durlon gasket materials should never be recommended when both the temperature and the pressure are at the maximums listed. Properties and applications shown are typical. No application 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 personal injury. The 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. The information and specifications contained in this website are subject to change without notice. This revision cancels and obsoletes all previous editions.


M&Y and Proposed ASTM Gasket Constants:

Thickness 1/16"
Gasket Constants    
Gb psi (MPa) 639 (4.4) 495 (3.41)
a 0.22 0.262
Gs psi (MPa) 55 (3.8) 65 (1.45)

*Gasket Constants based on proposed ASTM Draft 10.01


Typical Properties:

 Color: Style 9000 Blue, Branded
Style 9000n White, Branded
 Fiber: Inorganic
Temperature -350 to 520° F (-212 to 271° C)
Pressure, max: 1500 psig (103 bar)
Fluid Service: Steam, Oils, Liquid Chlorin, Acids, Caustics, Hydrogen Peroxide, Titanium Dioxide, Oleum, Liquid and Gaseous Oxygen 
Density:  2.2 g/cm3 (138 lbs. / ft3)
Tensile Strength, ASTM F152:  2000 psi (13.8 MPa)
Compressibility, ASTM F36: 8 to 16% 
Recovery ASTM F36: 40%
          ASTM F37 (Fuel A):
          ASTM F37 (Nitrogen):

0.01 m/hr
0.2 m/hr
 DIN 3535 Gas Permeability:  0.01 cc/min
 Creep Relaxation ASTM F38:  30%
 Flexibility, ASTM F147:  5x
Durlon 9000:
  • Conforms to the requirements of 21 CFR 177.1550 for food and drug contact.
  • Listed in Pamphlet 95 of The Chlorine Institute as an acceptable gasket material for dry chlorine service.
  • Tested and certified by the Federal Institute for Materials Testing & Research (BAM) for oxygen service.
  • For pressures up to 40 bar (585 psi) and temperatures up to 200°C (392°F).
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.