ASTM D7330-15 PDF Download

A common test procedure for evaluating changes in the surface appearance of pile floor coverings using common reference scales is ASTM D7330-15. During the production of pile yarn floor coverings, it is utilized to assess quality and manage costs. Due to the fact that it offers reliable estimates of between-laboratory precision, this test method is frequently used in trade for acceptance testing.

To find any statistical bias in reported test findings, the standard highlights the value of laboratory comparison testing. It advises using homogeneous samples taken from the same batch of material and distributing an equal number to each laboratory at random. The test results from various facilities are then compared using a statistical test for unpaired data. If a bias is discovered, it must be determined what caused it and fixed, or future tests on that material must be altered to account for the bias.

The test procedure can be used with pile yarn floor coverings that have already been put in place, samples that have been moved over a floor in a lab, or textile floor coverings that have been moved by mechanical traffic simulators. Utilizing digital reference scales based on typical pile yarn floor covering styles and constructions, the assessment of surface appearance changes is done subjectively.