EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ASTM D696 testing. This test method involves determining the linear coefficient of thermal expansion for plastic materials with coefficients of expansion greater than 1 μm ⁄(m.°C) using a vitreous silica dilatometer.
At test temperatures and under applied stresses, plastic materials should have a negligible rate of creep or elastic strain, or both, as these properties will significantly affect the accuracy of the measurements.
This test method should not be used for measurements on materials with a very low coefficient of expansion (less than 1 μm/(m.°C). For materials with a very low coefficient of expansion, interferometry or capacitance techniques are recommended.
An alternative technique commonly used to measure this property is thermomechanical analysis, as described in Test Method E831, which allows this property to be measured over a scanned temperature range.
The thermal expansion of a plastic consists of a reversible component in which length changes are superimposed 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 to determine the linear thermal expansion coefficient under the exclusion of these factors as far as possible. In general, it will not be possible to completely exclude the influence of these factors. Therefore, the test method can only be expected to give an approximation of the actual thermal expansion.
Values stated in SI units should be accepted as standard. Values in parentheses are for informational purposes only.
This standard does not purport to address all, if any, safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory restrictions prior to use.
EUROLAB assists manufacturers with ASTM D696 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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