ASTM D902-12

Standard Test Methods for Flexible Resin-Coated Glass Fabrics and Glass Fabric Tapes Used for Electrical Insulation (Withdrawn 2020)

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

STANDARD published on 1.4.2012

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The information about the standard:

Designation standards: ASTM D902-12
Note: WITHDRAWN
Publication date standards: 1.4.2012
SKU: NS-39682
The number of pages: 9
Approximate weight : 27 g (0.06 lbs)
Country: American technical standard
Category: Technical standards ASTM

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Ceramic and glass insulating materials

Annotation of standard text ASTM D902-12 :

Keywords:
breaking strength, coated glass fabric, dielectric breakdown voltage, dissipation factor, heat aging, permittivity, thermal endurance, thread count, 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

Additional information

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. Scope

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:

Procedure	Section	ASTM Test Method Reference
Breaking Strength	22-28	D828
Conditioning	6-8	...
Dielectric Breakdown Voltage and Di- electric Strength	29-38	D149, D295
Dissipation Factor and Relative Permit- tivity	52-60	D150, E104, D5032
Effect of Elevated Temperature	39-45	D1830
Resistance to Oil	46-51	D3487
Sampling	3-5	...
Thermal Endurance	68	D1830
Thickness	16-21	D374
Thread Count	12-15	...
Weight	9-11	...
Weight Loss at Elevated Temperature	61-67	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.

2. Referenced Documents

D295-12	Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation (Withdrawn 2020)
D828-22	Standard Test Method for Tensile Properties of Paper and Paperboard Using Constant-Rate-of-Elongation Apparatus
E104-20a	Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions (Includes all amendments and changes 12/21/2020).
IEEE No. 1	General Principles for Temperature Limits in the Rating of Electrical Equipment Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE), 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http://www.ieee.org.
D149-20	Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D150-22	Standard Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
D374-99	Standard Test Methods for Thickness of Solid Electrical Insulation
D1711-24	Standard Terminology Relating to Electrical Insulation
D1830-17	Standard Test Method for Thermal Endurance of Flexible Sheet Materials Used for Electrical Insulation by the Curved Electrode Method
D3487-16e1	Standard Specification for Mineral Insulating Oil Used in Electrical Apparatus (Includes all amendments and changes 1/1/2018).
D5032-19	Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Glycerin Solutions
D5423-23	Standard Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation

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