ASTM_D_3949_-_99.pdf

Designation:D 3949 99An American National StandardStandard Specification forCoated Glass Fabrics Used for Electrical Insulation1This standard is issued under the fixed designation D 3949;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(e)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:D 902 Test Methods for Flexible Resin-Coated Glass Fab-rics and Glass Fabric Tapes Used for Electrical Insulation2D 1711 Terminology Relating to Electrical Insulation2D 1830 Test Method for Thermal Endurance of FlexibleSheet Materials Used for Electrical Insulation by theCurved Electrode Method2D 2518 Specification for Woven Glass Fabrics for ElectricalInsulation3D 3636 Practice for Sampling and Judging Quality of SolidElectrical Insulating Materials33.Terminology3.1 Definitions:For definitions of terms used in this speci-fication refer to Terminology D 1711.4.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 con-formance with the requirements of Specification D 2518.6.2 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.7.Electrical and Mechanical Requirements7.1 The electrical and mechanical requirements shall be inaccordance with the values shown in Tables 1-3.1This specification is under the jurisdiction of ASTM Committee D-9 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.07 on Flexible and Rigid Insulating Materials.Current edition approved Oct.10,1999.Published November 1999.Originallypublished as D 3949 80.Last previous edition D 3949 94.2Annual Book of ASTM Standards,Vol 10.01.3Annual Book of ASTM Standards,Vol 10.02.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.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 than6116in.(1.6 mm)for widths 1 in.and over.Rolls trimmed to36 in.or 1 m shall not be less than that amount.Sheets shall bewithin 618in.(3.2 mm)of the nominal width and lengthspecified.8.3 LengthThe length in yards or metres per roll shall notbe less than specified.9.Workmanship and Appearance9.1 Visual NonconformitiesThe material shall be freefrom the following nonconformities to the extent specified in12.4:9.1.1 Weave distortion in base fabric,9.1.2 Wrinkles,creases,tears,9.1.3 Dirt in coating,9.1.4 Nonuniform application of coating(runs,drains,wrinkles,uncoated spots),9.1.5 Poor adhesion of coating to