ASTM_D_2518_-_99.pdf

Designation:D 2518 99An American National StandardStandard Specification forWoven Glass Fabrics for Electrical Insulation1This standard is issued under the fixed designation D 2518;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 applies to straight-cut(as opposed tobias-cut)plain weave greige(unfinished)glass fabric producedfrom continuous-filament yarns and suitable for use in theproduction of coated or treated fabric for electrical insulatingpurposes.1.2 Excluded from this specification are woven glass fabrictapes and fabrics intended for use primarily in laminatedconstructions.1.3 The values stated in inch-pound units are to be regardedas the standard.The values in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:D 123 Terminology Relating to Textiles2D 578 Specification for Glass Fiber Strands2D 1711 Terminology Relating to Electrical Insulation3D 1777 Test Method for Thickness of Textile Materials2D 1931 Specification for Fully Cured Silicone Rubber-Coated Glass Fabric and Tapes for Electrical Insulation3D 3636 Practice for Sampling and Judging Quality of SolidElectrical Insulating Materials4D 3773 Test Methods for Length of Woven Fabrics4D 3774 Test Methods for Width of Woven Fabrics4D 3775 Test Method for Fabric Count of Woven Fabric4D 3776 Test Methods for Mass per Unit Area(Weight)ofFabric4D 4029 Specification for Finished Woven Glass Fabrics4D 4963 Test Method for Ignition Loss of Glass Strands andFabrics4D 5035 Test Method for Breaking Strength and Elongationof Textile Fabrics(Strip Method)43.Terminology3.1 Definitions:3.1.1 Definitions employed herein are as indicated in Ter-minology D 123,except as further defined herein.3.1.2 For definitions of terms relating to electrical insulationrefer to Terminology D 1711.4.Ordering Information4.1 Orders for material covered by this specification shallinclude the width and length of each roll ordered.5.Materials and Manufacture5.1 Construction and Mechanical PropertiesThe fabricsshall meet the requirements of Table 1.6.Composition6.1 Yarns used in the preparation of these fabrics shallconform to the requirements for Types ECD,ECE,and ECGyarns as described in Specification D 578.7.Dimensions,Weights,and Permissible Variations7.1 WidthThe width of the fabric,measured outside theselvedge,shall not vary from that specified in the purchaseagreement by more than 60.5 in.(613 mm).7.2 Roll Length:7.2.1 The measured length of a roll of fabric shall be within10%of the nominal length shown in Table 1 except that 10%of the total length shipped may be on rolls of less than thestandard roll length but in no case shall the length of such rollsbe less than 30%of the nominal lengths shown under Table 1.7.2.2 The measured length of a roll shall be not less than98%of the length declared for each roll as shipped.7.3 Sizing:7.3.1 The fabric shall contain no lubricants or sizing otherthan those normally used in the weaving of greige fabric.7.3.2 The average amount of sizing in the fabric shall not bemore than 4.5 weight%,except for Styles 104 and 1610,whereit shall not be more than 6.0 weight%when determined inaccordance with the Organic Content section of Test MethodD 4963.NOTE1Experience indicates that where coated fabric must meetstringent wet dielectric strength requirements,as for example in Specifi-cation D 1931,a maximum size content of 2.6 weight%shall be required.8.Workmanship,Finish,and Appearance8.1 Determination of Nonconforming Rolls: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 2518 66 T.Last previous edition D 2518 94.2Annual Book of ASTM Standards,Vol 07.01.3Annual Book of ASTM Standards,Vol 10.01.4Annual Book of ASTM Standards,Vol 07.02.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.8.1.1 At any time prior to its use,any sample roll in the lotthat contains one or more of the following characteristics shallbe considered a nonconforming roll:8.1.1.1 Tight selvedges,8.1.1.2 Loose selvedges,8.1.1.3 Bagginess,8.1.1.4 Continuous wrinkles or creases,8.1.1.5 Uncleanliness or general dirtiness,8.1.1.6 Continuous excessively fuzzy or hairy surface,ascaused by broken filaments,8.1.1.7 Lint(continuous occurrence of loose tufts of fibers),or8.1.1.8 Color(pronounced departure from normal color ofgreige goods).8.1.2 Any sample roll in the lot in which any one of thewarp or filling nonconformances noted in 8.1.2.1-8.1.2.17occurs repeatedly throughout the entire roll