Inorganic Filler with Pure PTFE Resins

9000/9000N Inorganic/PTFE Gaskets


ASTM F104: F452111-A9B5E11K6M6


Durlon® 9000 (blue) & 9000N (white) are 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, gaseous 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 3 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 gaskets, 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 tested and certified (BAM) for oxygen service at pressures up to 585 psi (40 bar) and temperatures up to 392°F (200ºC), and for service in gaseous oxygen. Gaskets for gaseous oxygen service can be supplied from distributor stocks, providing proper cleaning procedures for gaseous oxygen service are followed before installation.

Passed API 6FA Fire Test: A bolted 6” Class 300 test fixture with Durlon® 9000 was subjected to an external flame for 30 minutes followed by a 10 minute cool down during which the flame temperature averaged 875°C (1607°F) with the test fixture at or above 650°C (1202°F) for 19.8 minutes. This was followed by a 5 minute post-burn test, and then a 5 minute operational test with the system depressurized then repressurized (547 psig avg.). Leakage during each test phase was significantly below the test allowables.


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 gasket products. It cuts easily and separates cleanly from flanges after use.

typical properties:

Color: Style 9000 - Blue, branded
Style 9000N - White, branded
Filler: Inorganic
Temperature Range: -350 to 520°F (-212 to 271°C)
Pressure, max: 1500 psig (103 bar)
Fluid Services: Steam, Oils, Liquid Chlorine, Acids, Caustics, Hydrogen Peroxide, Titanium Dioxide, Oleum, Liquid & Gaseous Oxygen
Density: 2.2 g/cm3 (138 lbs./ft3)
Tensile Strength, ASTM F152: 2,000 psi (13.8 MPa)
Compressibility, ASTM F36: 8 to 16%
Recovery ASTM F36: 40%
ASTM F37 (Fuel A):
ASTM F37 (Nitrogen):

0.01 mL/hr
0.02 mL/hr
DIN 3535 Gas Permeability: 0.01 cc/min
TA-Luft (VDI Guideline 2440):
temperature of exposure:
period of exposure:
test pressure (helium):
leak rate:
period leak rate measured:
180°C (356°F)
48 h
1 bar (14.5 psig)
7.55E-6 mbar*l(m*s)
24 h
BAM - Oxygen Testing: Gaseous oxygen
up to 40 bar (580 psig) and 200°C (392°C)
Liquid oxygen
Pamphlet 95, The Chlorine Institute: Listed Table 3-1, for dry chlorine service
and Table 3-3, for wet chlorine service
FDA: Conforms to the requirements of
21 CFR 177.1550 for food and drug contact.
Volume Resistivity, ASTM D257: 1.0 x 105 ohm-cm
Dielectric Breakdown, ASTM D149: 16 kV/mm (406 V/mil)
Creep Relaxation ASTM F38: 30%
Flexibility, ASTM F147: 5x

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

Pressure - Temperature Information: PxT Chart

m&y and proposed astm gasket constants:

THICKNESS 1/16" 1/8"
Y psi (MPa)
1937 (13.36)
1639 (11.3)
Gasket Constants
Gb psi (MPa)
Gs psi (MPa)

639 (4.4)
55 (0.38)

495 (3.41)
65 (1.45)
*Gasket Constants based on proposed ASTM Draft 10.1

available sheet sizes:

Nominal ThicknessSheet Sizes
inches mm
Order Code
Order Code
Weight/ Sheet
lbs (kg)
1/64" 0.5mm 60 x 60 1524 x 1524 TB05-060-060 TN05-060-060 4 (2)
1/32" 0.8mm 60 x 60 1524 x 1524 TB08-060-060 TN08-060-060 9 (4)
1/16" 1.5mm 60 x 60 1524 x 1524 TB15-060-060 TN15-060-060 18 (8)
2.0mm 60 x 60 1524 x 1524 TB20-060-060 TN20-060-060 24 (11)
3/32" 2.5mm 60 x 60 1524 x 1524 TB25-060-060 TN25-060-060 27 (12)
1/8" 3.0mm 60 x 60 1524 x 1524 TB30-060-060 TN30-060-060 36 (16)
3/16" 5.0mm 60 x 60 1524 x 1524 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.