ASTM D1777-96 (2015) pdf free.Standard Test Method for Thickness of Textile Materials.
1.1 Precondition the specimens by bringing them to approximate moisture equilibrium in the standard atmosphere for preconditioning textiles as specified in Practice D1776, unless otherwise specified in a material specification or contract order.
1.2 After preconditioning, bring the test specimens to moisture equilibrium for testing in the standard atmosphere for testing textiles as specified in Practice D1776 or, if applicable,in the specified atmosphere in which the testing is to be performed, unless otherwise specified in a material specification or contract order.
2.1 Computer- Processed Data- -When data are automatically computer-processed, calculations generally are contained in the associated software. Record values as read from the direct-reading scale designated in the readability column of Table 1, unless otherwise specified. In any event, it is recommended that computer-processed data be verified against known property values and its software described in the report.
2.2 Report that the thickness was determined in accordance with Test Method D1777. Describe the material or product sampled and the method of sampling used.
2.3 Report the following information for each laboratory sampling unit and for the lot as applicable to a material specification or contract order:
2.3.1 Testing option selected from Table 1.
2.3.2 When calculated, the standard deviation or the coefficient of variation.
3.1 Sunmary- In comparing two averages, the differences should not exceed the single-operator precision values shown in Table 3 for the respective number of tests and for materials having averages similar to those shown in Table 1 in 95 out of 100 cases when all the observations are taken by the same well-trained operator using the same piece of equipment and specimens randomly drawn from the sample of material.Larger differences are likely to occur under all other circumstances.
3.2 The value of thickness of fabrics only can be defined in terms of a test method. Within this limitation, this test method has no known bias.ASTM D1777 pdf download.