The thickness test is necessary to determine whether the material meets specified tolerances for thickness. In addition, thickness values are essential because of the importance of space factor in designing electrical equipment.
1.1 These test methods cover procedures for the testing of varnished cotton fabrics and varnished cotton fabric tapes (Note 0) to be used as electrical insulation and are directly applicable to both "straight-cut" and "bias-cut" materials, unless otherwise stated in the test method. Note 18212;Methods of testing varnished glass fabrics and tapes are given in Test Methods D 902.
1.2 The procedures appear in the following order:
| Procedures | Sections | ASTM Test Methods |
| Breaking Strength | to | ... |
| ConditioningDielectric Breakdown Voltage | to | ...D 149 |
| Dielectric Breakdown Voltage Under Elongation | to | D 149 |
| Dissipation Factor and Permittivity | to | D 150 |
| ElongationResistance to Oil | to to | ...D 92 |
| Selection of Test Specimens | ... | |
| Tear Resistance | to | D 689 |
| Thickness | to | D 374 |
| Thread Count | to | ... |
| Volume Resistance | to | D 257 |
| Weight | to | ... |
1.3 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This standard resembles IEC 60394-2 in title only. The content is significantly different.
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