ASTM_D_1459_-_93_2003.pdf

Designation:D 1459 93(Reapproved 2003)An American National StandardStandard Specification forSilicone Varnished Glass Cloth and Tape for ElectricalInsulation1This standard is issued under the fixed designation D 1459;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 clear silicone varnished glassfabrics in the form of sheets,rolls,and tapes for use aselectrical insulation.1.2 The product covered by this specification shall bedesigned to conform to Class 180 electrical insulating materialsas classified by IEEE Standard No.1.1.3 The values stated in inch-pound units are to be regardedas the standard except temperature which is stated in degreescelsius.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 3636 Practice for Sampling and Judging Quality of SolidElectrical Insulating Materials32.2IEEE Standard:4No.1 General Principles Upon Which Temperature Limitsare Based in the Rating of Electric Machines and OtherEquipment3.Terminology3.1 Definitions:For definitions of terms used in this stan-dard,refer to Terminology D 1711.4.Types4.1 This specification covers two types of silicone varnishedglass fabrics as follows:4.1.1 Type AFor use where primarily electrical propertiesare required,and4.1.2 Type BFor use where primarily physical propertiesare required.5.Ordering Information5.1 Orders for material covered by this specification shallinclude the following information:5.1.1 The form and type(Sections 1 and 4),5.1.2 The desired nominal thickness,width,and length(Section 8),5.1.3 The number of rolls in a package(Section 15),and5.1.4 The marking on a package(Section 15).6.Materials and Manufacture6.1 The glass fabric shall be treated with a baking type ofsilicone varnish so as to penetrate the fabric and produce asmooth,non-tacky surface,substantially free of wrinkles,creases,blisters,and other imperfections.6.2 The material shall not be spliced.No more than twopieces shall be used in each multiple of 25 yd(23 m)of linearlength in any one roll of full-width cloth,and no more than twopieces shall be used in each multiple of 36 yd(33 m)of linearlength in any one roll of tape.7.Physical Properties7.1 Breaking StrengthThe warp average breaking strengthof the material in the warp thread direction shall be not lessthan that prescribed for the corresponding types and nominalthicknesses designated in Table 1.8.Dimensional Requirements8.1 ThicknessThe average thickness shall not vary morethan 60.5 mil(0.013 mm)from the nominal thicknesses forspecified thicknesses up to and including 5 mils(0.13 mm),and610%from the nominal thickness for specified thicknessesabove 5 mils.8.2 WidthFull-width rolls and sheets shall be 36 61 in.(900 625 mm)in width,and shall be supplied trimmed unlessotherwise specified.The width of individual tapes shall notvary more than 6132in.(0.8 mm)from the specified width for1This 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 March 10,2003.Published April 2003.Originallyapproved in 1957.Last previous edition approved in 1998 as D 1459 93(1998).2Annual Book of ASTM Standards,Vol 10.01.3Annual Book of ASTM Standards,Vol 10.02.4Available from The Institute of Electrical and Electronics Engineers,Inc.,445Hoes Lane,Piscataway,NJ 088541331.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.tapes 112in.(38 mm)or less in width,nor more than 6116in.(1.6 mm)for tapes over 112in.in width.8.3 LengthThe nominal length per roll shall be as speci-fied in the purchase order.The measured lengths of individualrolls or sheets shall be not less than that specified.8.4 CoreMaterial in roll or tape form shall be supplied oncardboard cores the inside diameter of which shall be 112in.(38 mm),unless otherwise specified.9.Thermal Requirements9.1 Silicone varnished glass fabric shall have a temperatureindex at 20 000 h of 180 minimum when tested in accordancewith Test Method D 1830.10.Electrical Requirements10.1 Dielectric Strength(As Received)Minimum accept-able average values of dielectric strength,as received,aregiven in Table 1.10.2 Dielectric Breakdown(Before and After Baking)Usethe procedure for Effect of Elevated Temperature of TestMethods D 902.10.2.1 Minimum acceptable average dielectric breakdownvoltages after bending with