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.

Test Procedure:
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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