AFM 44
Technical Data Sheet 344
Edition: 08/2015, supersedes all prior editions.
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AFM 44 is an asbestos-free gasket material. It consists of carbon fibers and other asbestos substitutes that are resistant to high temperatures and are processed with high-grade elastomers under elevated pressure and temperatures.

AFM 44 exhibits very good temperature resistance together with high mechanical strength, as shown by its high values for residual stress and tensile strength. It is ideally suited for sealing gases and liquids, and also features high chemical resistance, e.g. with lyes.
  • in the petroleum and chemical processing industries
  • for pipe flanges to DIN and ANSI, apparatus, pumps, heat exchangers, and fittings in industrial applications
  • for sealing engine, transmission, hydraulic, and refrigerating oils
  • for sealing fuels, mixtures of water, antifreeze & corrosion inhibitors
  • for sealing leaches, lyes, and solvents

As standard, both sides of AFM 44 are coated with a non-stick layer that greatly facilitates disassembly. In most cases, additional surface treatment is unnecessary.

Grade X
acc. to BS 7531

Technical Data
(nominal thickness
2.00 mm)
Density g/cm³ 1.75 - 1.95

Ignition loss acc. to DIN 52 911


< 34

Tensile strength
acc. to ASTM F 152, across grain N/mm²
> 15
acc. to DIN 52 910, across grain N/mm²
> 10

Residual stress acc. to DIN 52 913
16 h, 300 °C N/mm² ≈ 25
16 h, 175 °C N/mm² ≈ 36

Compressibility and recovery
acc. to ASTM F 36, procedure J
compressibility % 6 - 10
recovery % > 60

Sealability against nitrogen
acc. to DIN 3535, part 6 FA mg/(s·m) ≈ 0.1

acc. to ASTM F 146:

in IRM 903 Oil
(replaces ASTM Oil No. 3)
5 h, 150 °C
increase in thickness % < 10
increase in weight % < 10

in ASTM Fuel B
5 h, room temp.
increase in thickness % < 10
increase in weight % < 10

in water / antifreeze (50:50)
5 h, 100 °C
increase in thickness % < 7
increase in weight % < 7

Short-term peak temperature



Maximum continuous temperature



Maximum operating pressure



Max. continuous temperature and max. pressure must not occur simultaneously, please refer to the table entitled
"Max. operating pressures at various temperatures and with various media".

Sealing parameters see corresponding Table

The data quoted above are valid for the material "as delivered" without any additional treatment. In view of the countless possible installation and operating conditions, definitive conclusions cannot be drawn for all applications regarding the behaviour in a sealed joint. Therefore, we do not give any warranty for technical data, as they do not represent assured characteristics. If you have any doubt, please contact us and specify the exact operating conditions.

Form of delivery
Gaskets according to a drawing, dimensions supplied, or other arrangement.

Sheets 1500 x 1500 mm (standard size)

Nominal thicknesses and tolerances acc. to DIN 28091-1 (mm)
Dimensional l
imits within a shipment


Max. thickness variation in a sheet:
0.1 mm for sheet thickness ≤1.00 mm, and 0.2 mm for thickness >1.00 mm