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ASTM D3949 Standard Specification for Coated Glass Fabrics Used for Electrical Insulation

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ASTM D3949电绝缘用玻璃涂层织物标准规范
ASTM D3949 Standard Specification for Coated Glass Fabrics Used for Electrical Insulation
ASTM D3949电绝缘用玻璃涂层织物标准规范
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. Materials are identified according to the type of coating applied, as follows: Type 1, black oleoresinous varnish; Type 2, yellow oleoresinous varnish; Type 3, epoxy resin; Type 4, polyurethane (isocyanate) resin; and Type 5, polyester resin. Glass fabrics shall meet specified values for electrical (dielectric strength at room temperature after bending, and breakdown voltage after aging at an elevated temperature), mechanical (breaking strength, oil resistance, and temperature index), and dimensional (nominal thickness, width, and length) property requirements.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 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.
1.2 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.
1.3 The values stated in inch-pound units are to be regarded as the standard.

2. Referenced Documents (purchase separately)
ASTM Standards
D902 Test Methods for Flexible Resin-Coated Glass Fabrics and Glass Fabric Tapes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
D1830 Test Method for Thermal Endurance of Flexible Sheet Materials Used for Electrical Insulation by the Curved Electrode Method
D2518 Specification for Woven Glass Fabrics for Electrical Insulation
D3636 Practice for Sampling and Judging Quality of Solid Electrical Insulating Materials
Index Terms
coated glass fabric; electrical insulation; epoxy resin coated glass fabric; polyester resin coated glass fabric; polyurethane resin coated glass fabric; oleoresinous varnish; coated glass fabric;
 
 
 
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