GSO ASTM D6341:2021
Gulf Standard
Current Edition
·
Approved on
01 July 2021
·
Standard Test Method for Determination of the Linear Coefficient of Thermal Expansion of Plastic Lumber and Plastic Lumber Shapes Between –30 and 140°F (–34.4 and 60°C)1
GSO ASTM D6341:2021 Files
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5 Pages
Current Edition
Reference Language
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GSO ASTM D6341:2021 Scope
1.1 This test method covers the determination of the coefficient of linear thermal expansion for plastic lumber and
plastic lumber shapes to two significant figures. The determination is made by taking measurements with a caliper at three
discrete temperatures. At the test temperatures and under the
stresses imposed, the plastic lumber shall have a negligible
creep or elastic strain rate, or both, insofar as these properties
would significantly affect the accuracy of the measurements.
1.1.1 This test method details the determination of the linear
coefficient of thermal expansion of plastic lumber and plastic
lumber shapes in their “as manufactured” form. As such, this is
a test method for evaluating the properties of plastic lumber or
shapes as a product and not a material property test method.
1.2 The thermal expansion of plastic lumber and shapes is
composed of a reversible component on which it is possible to
superimpose changes in length due to changes in moisture
content, curing, loss of plasticizer or solvents, release of
stresses, phase changes, voids, inclusions, and other factors.
This test method is intended to determine the coefficient of
linear thermal expansion under the exclusion of non-linear
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 a reasonable approximation but not necessarily precise determination of the linear
coefficient of thermal expansion.
1.3 Plastic lumber and plastic lumber shapes are currently
made predominately with recycled plastics where the product
is non-homogeneous in the cross-section. However, it is
possible that this test method will also be applicable to similar
manufactured plastic products made from virgin resins or other
plastic composite materials.
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