ASTM D696-2003 线性热膨胀系数测试标准

ASTM D696-2003 线性热膨胀系数测试标准

ASTM D696-2003 线性热膨胀系数测试标准.pdf
(2010-05-05 09:46:51, Size: 53.5 KB, Downloads: 24)

Standard Test Method for
Coefficient of Linear Thermal Expansion of Plastics
Between −30°C and 30°C with a Vitreous Silica Dilatometer 1
This standard is issued under the fixed designation D 696; 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*
1.1 This test method covers determination of the coefficient
of linear thermal expansion for plastic materials having coefficients
of expansion greater than 1 3 10−6 1°C by use of a
vitreous silica dilatometer. At the test temperatures and under
the stresses imposed, the plastic materials shall have a negligible
creep or elastic strain rate or both, insofar as these
properties would significantly affect the accuracy of the measurements.
NOTE 1—There is no similar or equivalent ISO standard.
1.1.1 Test Method E 228 shall be used for temperatures
other than −30°C to 30°C.
1.1.2 This test method shall not be used for measurements
on materials having a very low coefficient of expansion (less
than 1 3 10 −6 1°C). For materials having very low coefficient
of expansion, interferometer or capacitance techniques are
1.2 The thermal expansion of a plastic is composed of a
reversible component on which are superimposed changes in
length due to changes in moisture content, curing, loss of
plasticizer or solvents, release of stresses, phase changes and
other factors. This test method is intended for determining the
coefficient of linear thermal expansion under the exclusion of
these factors as far as possible. In general, it will not be
possible to exclude the effect of these factors completely. For
this reason, the test method can be expected to give only an
approximation to the true thermal expansion.
1.3 The values stated in SI units are to be regarded as the
standard. The values in parentheses are for information only.
1.4 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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