AFM 31
Technical Data Sheet 331 (previously TDS 272)
Edition: 08/2015, supersedes all prior editions.
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Material
AFM 31 is an asbestos-free gasket material. It is composed of aramide fibers and other asbestos substitutes which are resistant to high temperatures. These substitutes are processed with high-grade elastomers under elevated pressure and temperature.

Properties
AFM 31 is a highly conformable gasket material featuring high compressibility and flexibility plus very good sealability against fluids and gases.

Application
  • for sealed joints on lightweight components where surface pressure is relatively low, e.g. on valve covers, oil pans, covers, in IC engines, compressors, pipelines, apparatus and transmissions.
  • for sealing engine, transmission, hydraulic, and refrigerating oils
  • for sealing fuels, water, mixtures of water and antifreeze & corrosion inhibitors.

Surfaces
As standard, both sides of AFM 31 are coated with a non-stick, high-friction layer that greatly facilitates disassembly. In most cases, additional surface treatment is unnecessary.

Technical Data
(nominal thickness
2.00 mm)
Density

g/cm³

1.4 - 1.7

Ignition loss acc. to DIN 52 911

%

< 45

Tensile strength
acc. to ASTM F 152 across grain

N/mm² > 8
acc. to DIN 52 910 across grain



N/mm²

> 6

Residual stress acc. to DIN 52 913
16 h, 175 °C

N/mm²

≈ 24

Compressibility and recovery
acc. to ASTM F 36, procedure J
compressibility % 14 - 23
recovery

%

> 50

Sealability against nitrogen
acc. to DIN 3535, part 6 FA

mg/(s·m)

< 0.01

Swelling 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

%

< 20

in ASTM Fuel B
5 h, room temp.
increase in thickness % < 15
increase in weight

%

< 20

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

%

< 15

Maximum continuous temperature

°C

250

Maximum operating pressure

bar

80

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".

 
DIN 28091-2:

Cold creep εKSW

%

11 - 20

Cold recovery εKRW

%

6 - 11

Hot creep during service εWSW/T

%

60 - 70

Hot recovery εWRW/T

%

≈ 0.8

Recovery  R

mm

≈ 0.015

Specific leakage rate λ

mg/(s·m)

< 0.025

Residual surface pressure

%

> 50
after 1000 h (in air at 100 °C)

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

0.30
±0.10
0.50
±0.10
0.75
±0.10
1.00
±0.10
1.50
±0.15
2.00
±0.20

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

© VICTOR REINZ 2020