ASTM F1574-03
(Test Method)Standard Test Method for Compressive Strength of Gaskets at Elevated Temperatures
Standard Test Method for Compressive Strength of Gaskets at Elevated Temperatures
SCOPE
1.1 This test method covers the determination of compressive strength characteristics (crush-extrusion resistance) of gasket materials at elevated temperature.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: F 1574 – 03
Standard Test Method for
Compressive Strength of Gaskets at Elevated
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Temperatures
This standard is issued under the fixed designation F 1574; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope selection of a given material for use in a particular sealing
application. The significance of the test method is based, in
1.1 This test method covers the determination of compres-
part, on the assumption that a material, once it has been
sive strength characteristics (crush-extrusion resistance) of
crushed or extruded, will no longer function as effectively as a
gasket materials at elevated temperature.
seal. This assumption can only be used as a guide, however,
1.2 This standard does not purport to address all of the
since exact yield or failure points are difficult to define for
safety concerns, if any, associated with its use. It is the
gasket materials (which are usually viscoelastic in nature). Two
responsibility of the user of this standard to establish appro-
or more materials can be compared to determine differences in
priate safety and health practices and determine the applica-
their resistance to compressive stress. A sample of material can
bility of regulatory limitations prior to use.
be compared to an established standard or previously deter-
2. Referenced Documents mined characteristics on original lots of the same material, for
quality assurance purposes. See 6.2 for discussion of specimen
2.1 ASTM Standards:
area and geometry effects.
F 104 Classification System for Nonmetallic Gasket Mate-
2
rials
5. Apparatus
2
F 1315 Test Method for Density of a Sheet Gasket Material
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5.1 Testing Machine , for applying a known value of com-
3. Summary of the Test Method
pressive stresses to specimens. The machine should be capable
of applying a stress of up to 517 MPa (75 000 psi) (tolerance
3.1 Specimens cut from gasket material are subjected to
of 65 %), depending on the indent resistance of the steel
various stresses perpendicular to the flat surface of the speci-
platens and the means of reading the applied load.
mens for a specified time at 149°C (300°F). Dimensional
5.2 Hardened Steel Platens, Two (Rockwell of C35 to 40 or
changes to the thickness and in the plane of the specimen are
equivalent), circular shape, larger than the specimen diameter.
determined while it is under stress and after the stress has been
A suitable size is a diameter of approximately 101 mm (4 in.).
removed. A graphical display of percent deformation plotted
The surface finish shall be RMS 0.25 to 0.50 μm (10 to 20 μm).
against the applied stress will enable determination of a
Fig. 1 shows a suitable arrangement of steel platens and test
compressive yield stress point beyond which the material will
specimen.
no longer decrease in thickness without also extruding in the
5.3 Device for Applying Heat to Platens sufficient to
planar dimensions. This condition is also revealed by physical
achieve a desired temperature at interface with gasket material
measurements of the change in size of the specimens in the
specimens. An example of this device is also shown in Fig. 1,
planar dimensions. Tests may be performed at various tempera-
where a resistance heater surrounds the hardened platens. In
tures, as agreed upon between the producer and the user, to
some cases, the loading device itself may be heated, such as
determine the relationship between temperature and compres-
with a hot press. Any appropriate means is acceptable. The
sive behavior.
recommended elevated temperature is 149 6 5°C (300 6 9°F).
4. Significance and Use
Other temperatures may be employed as desired, or as agreed
upon between the producer and the user.
4.1 The compressive strength or crush-extrusion resistance
5.4 Temperature Measuring Device for use at interface,
of a gasket material is a major factor with regard to the
such as a thermocouple assembly and a means for recording the
voltage.
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This test method is under the jurisdiction of ASTM Committee F03 on Gaskets
and is the direct responsibility of Subcommittee F03.20 on Mechanical Test
Methods.
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Current edition approved April 10, 2003. Published May 2003. Originally Examples of such equipment include Baldwin-Southwark, Instron, Tinius-
approved in 1995. Last previous edition approved in 1995 as F 1574 – 95. Olsen, MTS, or any type of pressing device which has been properly calibrated to
2
Annual Book of ASTM Standards, Vol 09.02. apply a known force.
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