ASTM F1087-02(2023)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1087 − 02 (Reapproved 2023)
Standard Test Method for
Linear Dimensional Stability of a Gasket Material to
Moisture
This standard is issued under the fixed designation F1087; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope materials is needed for design and quality assurance purposes.
This test method is useful towards that end. It simulates the
1.1 This test method covers a procedure to determine the
extreme storage conditions that a material may undergo prior to
stability of a gasket material to linear dimensional change due
installation. Samples are allowed unrestricted expansion or
to hygroscopic expansion and contraction. It subjects a sample
contraction, and so this test method should not be used to
to extremes, that is, oven drying and complete immersion in
predict behavior clamped in a flange or other applications, or
water, that have shown good correlation to low and high
2 during specific processing steps.
relative humidities.
3.2 This test method measures linear change, and may need
1.2 The values stated in SI units are to be regarded as the
to be modified if the test specimen is not flat, homogeneous, or
standard. The values given in parentheses are for information
free of voids.
only.
1.3 This standard does not purport to address all of the
4. Apparatus
safety concerns, if any, associated with its use. It is the
4.1 This test method allows individual laboratories to select
responsibility of the user of this standard to establish appro-
measuring devices of their own choice, but requires that the
priate safety, health, and environmental practices and deter-
device be able to measure with a precision of 60.025 mm
mine the applicability of regulatory limitations prior to use.
(0.001 in.).
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5. Sampling
ization established in the Decision on Principles for the
5.1 At least six test specimens should be taken for each
Development of International Standards, Guides and Recom-
sample material, three for the high humidity and three for the
mendations issued by the World Trade Organization Technical
low humidity tests. The samples should be cut 2.54 cm (1.00
Barriers to Trade (TBT) Committee.
in.) wide, and between 20 and 30 cm (8 and 12 in.) in length.
The long direction should be in the direction that experiences
2. Summary of Test Method
the greatest dimensional change, generally the cross machine
2.1 A series of samples are preconditioned to a stable
or against the grain direction. If there is doubt, both directions
starting point, measured, and then conditioned to a second
should be sampled, and the results of the direction with the
exposure condition, either wet or dry. These changes are then
greatest change reported.
determined and recorded, and the results presented as percent
change.
6. Conditioning
6.1 Test specimens should be preconditioned at least 20 h in
3. Significance and Use
a controlled environment maintained between 21 to 30°C (70
3.1 Gasket materials undergo several processing steps from
to 85°F) and 50 to 55 % relative humidity.
point of manufacture to installation in a flange. Many applica-
tions require close control of dimensional change. An accurate
7. Procedure
test method for determining the relative stability of various
7.1 Measure test specimens to 60.025 mm (60.001 in.) and
record values as initial readings. If the test specimen is marked
This test method is under the jurisdiction of ASTM Committee F03 on Gaskets
for identification or measurement, be certain that the mark is
and is the direct responsibility of Subcommittee F03.20 on Mechanical Test
easily visible and will withstand exposure to heat and immer-
Methods.
sion in water.
Current edition approved April 1, 2023. Published April 2023. Originally
approved in 1988. Last previous edition approved in 2016 as F1087 – 02 (2016).
7.2 Testing for Dimensional Stability to Low Humidity—
DOI: 10.1520/F1087-02R23.
Expose three prepared specimens in a forced hot-air oven set at
Since this test method takes a “worst case” approach, actual dimensional
change due to atmospheric conditions would be expected to be
...