Dimensional Stability ASTM D1204
Dimensional Stability is a measurement of the linear dimensional change resulting from exposure to temperature. The test gives an indication of lot-to-lot uniformity with regards to internal stress introduced during processing. The test is mostly used for sheeting or film made by extrusion or calendar processes.
The dimensions of the specimen are taken at reference marks. Talc dusted paper is inserted to form a sandwich around the specimen. The sandwiched specimens are placed in an oven for a specified amount of time. After removal from the oven, the specimens are reconditioned at room temperature for a minimum of one hour. The distances between the reference marks are re-measured and recorded.
Percent linear change is equal to final length minus original length divided by original length multiplied by 100.
% change = (final length - original length)/ original length x 100
**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. Standards can be obtained from appropriate standards authorities.
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