ASTM_D_3949_-_99_2004.pdf

Designation:D394999(Reapproved 2004)An American National StandardStandard Specification forCoated Glass Fabrics Used for Electrical Insulation1This standard is issued under the fixed designation D3949;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers woven glass fabric coated withfully cured oleoresinous varnish,epoxy resin,polyurethaneresin,or polyester resin.Excluded are coated polyester-glassfabric and glass fabric coated with silicone resins and siliconeelastomers.1.2 It is recognized that several properties,notably breakingstrength and dielectric strength,are related to the style of basefabric used for any particular thickness.This specification hasbeen developed for materials using fabrics woven from rela-tively coarse-filament yarns and in some cases from relativelyopen-weave constructions,and property values are frequentlysomewhat lower than if finer filament yarns or closer weaveconstructions were used.The user is therefore alerted thatsignificantly higher levels of performance test values may beobtained through the use of these latter types of alternate baseconstructions.1.3 The values stated in inch-pound units are to be regardedas the standard.2.Referenced Documents2.1 ASTM Standards:2D902 Test Methods for Flexible Resin-Coated Glass Fabricsand Glass Fabric Tapes Used for Electrical InsulationD1711 Terminology Relating to Electrical InsulationD1830 Test Method for Thermal Endurance of FlexibleSheet Materials Used for Electrical Insulation by theCurved Electrode MethodD2518 Specification for Woven Glass Fabrics for ElectricalInsulationD3636 Practice for Sampling and Judging Quality of SolidElectrical Insulating Materials3.Terminology3.1 Definitions:For definitions of terms used in this speci-fication refer to Terminology D1711.4.Classification4.1 The materials of this specification are identified accord-ing to the type of coating applied,as follows:4.1.1 Type 1Black oleoresinous varnish,4.1.2 Type 2Yellow oleoresinous varnish,4.1.3 Type 3Epoxy resin,4.1.4 Type 4Polyurethane(isocyanate)resin,and4.1.5 Type 5Polyester resin.5.Ordering Information5.1 Orders for material covered by this specification shallinclude the following:5.1.1 Type of coating,5.1.2 Nature of finish,if any(waxy,greasy,dry,oily,mica-dusted,and so forth),5.1.3 Color of coating(oleoresinous only),5.1.4 Nominal coated thickness and base fabric thickness,5.1.5 Put-up,5.1.5.1 Full-Width Rollscore size,trimmed or untrimmed,length and width,5.1.5.2 Sheetslength and width,5.1.5.3 Tapescore size,length,width,5.1.6 Number of units per package,5.1.7 Type of packaging(sealed unit packages,carton size,pallet size),and5.1.8 Marking on unit packages and cartons.6.Materials and Manufacture6.1 MaterialsThe base fabric for all thicknesses shall bewoven from continuous-filament yarns and shall be in confor-mance with the requirements of Specification D2518.6.2 SplicesThe material shall not be spliced unless agreedupon by the purchaser and seller.If it is necessary to splicerolls,splices shall occur not more than once in each 100 yd(92m)or less,except that rolls having a length of 10 yd(9 m)orless shall contain no splices.Sheet materials shall contain nosplices.1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.07 on Flexible and Rigid Insulating Materials.Current edition approved Nov.1,2004.Published November 2004.Originallyapproved in 1980.Last previous edition approved in 1994 as D3949 94.DOI:10.1520/D3949-99R04.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesNOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information17.Electrical and Mechanical Requirements7.1 The electrical and mechanical requirements shall be inaccordance with the values shown in Tables 1-3.8.Dimensional Requirements8.1 Thickness shall be in accordance with the values shownin Table 4.8.2 WidthIndividual measurements on all samples se-lected shall not vary from the nominal by more than 6132in.(0.8 mm)for widths up to 1 in.(25 mm)and by more than 6116in.(1.6 mm)for widths 1 in.and over.Rolls trimmed to 36 in.or 1 m shall not be less than that amount.Sheets shall be within618in.(3.2 mm)of the nominal width and length specified.8.3 LengthThe length in yards or metres per roll shall notbe less than specified