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ASTM D3949

1999 Edition, October 10, 1999

Complete Document

Standard Specification for Coated Glass Fabrics Used for Electrical Insulation

Includes all amendments and changes through Reapproval Notice , 2004

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Product Details:

  • Revision: 1999 Edition, October 10, 1999
  • Published Date: January 2004
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 4
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:

This specification covers woven glass fabric coated with fully cured oleoresinous varnish, epoxy resin, polyurethane resin, or polyester resin. Excluded are coated polyester-glass fabric and glass fabric coated with silicone resins and silicone elastomers.

It is recognized that several properties, notably breaking strength and dielectric strength, are related to the style of base fabric used for any particular thickness. This specification has been developed for materials using fabrics woven from relatively coarse-filament yarns and in some cases from relatively open-weave constructions, and property values are frequently somewhat lower than if finer filament yarns or closer weave constructions were used. The user is therefore alerted that significantly higher levels of performance test values may be obtained through the use of these latter types of alternate base constructions.

The values stated in inch-pound units are to be regarded as the standard.