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ASTM D902-12

ASTM D902-12

Standard Test Methods for Flexible Resin-Coated Glass Fabrics and Glass Fabric Tapes Used for Electrical Insulation (Withdrawn 2020)

2020-03-09 /Withdrawn
No replacement
Significance and Use:

The electrical properties of resin-coated glass fabrics are affected by their temperature and moisture content. For this reason it is necessary to control these properties for a specified time immediately prior to testing in order to attain reasonably good reproducibility of test values. The time of exposure to the conditioning atmosphere must be long enough to permit the test specimen to reach a relatively stable value. Usually the moisture content of these materials has little effect on the mechanical properties.


1.1 These test methods cover procedures for the testing of resin-coated glass fabrics and glass fabric tapes (Note 1) to be used as electrical insulation.

Note 1—Methods of testing varnished cloths and tapes are given in Methods D295.

1.2 The warp threads in fabrics are the threads that are parallel with the length dimension as manufactured.

1.3 The procedures appear as follows:


Method Reference
Breaking Strength22-28D828
Conditioning 6-8...
Dielectric Breakdown Voltage and Di-
electric Strength
29-38D149, D295
Dissipation Factor and Relative Permit-
52-60D150, E104, D5032
Effect of Elevated Temperature39-45D1830
Resistance to Oil46-51D3487
Sampling 3-5...
Thermal Endurance68 D1830
Thread Count12-15...
Weight 9-11...
Weight Loss at Elevated Temperature61-67 D5423

1.4 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.

1.5 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. Specific warning statement are given in 35.1.1 and 58.1.

breaking strength; coated glass fabric; dielectric breakdown voltage; dissipation factor; heat aging; permittivity; thermal endurance; thread count<brk>; Oleoresinous varnish-coated glass fabric/tape; Permittivity (dielectric constant)--electrical insulating materials; Permittivity method; Resins; Thermal endurance--electrical insulating materials; Breaking strength/tenacity--electrical insulating materials; Dielectric breakdown voltage; Dissipation factor; Electrical insulating tape; Glass electrical/electronic insulation; Heat aging; Insulating tape; Oil resistance--electrical insulating materials; Thread count; Varnish-coated glass fabric/tape
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