ASTM_D_1458_-_13.pdf

Designation:D145813Standard Test Methods forFully Cured Silicone Rubber-Coated Glass Fabric and Tapesfor Electrical Insulation1This standard is issued under the fixed designation D1458;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 These test methods cover procedures for testing fullycured silicone rubber-coated glass fabric and tapes to be usedfor electrical insulation.1.2 The procedures appear in the following order:ProcedureSectionsASTMReferencesBreaking Strength7D828Breaking Strength After Creasing8.Conditioning5.Dielectric Breakdown Voltage9D149,D295,D6054Dielectric Proof-Voltage10D1389Dissipation Factor and Relative Permittivity11D150Sampling4.Thermal Endurance15D1830Thickness6D374Thread Count14.Volume Resistivity12D257Weight13.1.3 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.See 9.5.1 for aspecific warning statement.2.Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD202 Test Methods for Sampling and Testing UntreatedPaper Used for Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD295 Test Methods for Varnished Cotton Fabrics Used forElectrical InsulationD374 Test Methods for Thickness of Solid Electrical Insu-lation(Withdrawn 2013)3D828 Test Method for Tensile Properties of Paper andPaperboard Using Constant-Rate-of-ElongationApparatus(Withdrawn 2009)3D1389 Test Method for Proof-Voltage Testing of Thin SolidElectrical Insulating Materials(Withdrawn 2013)3D1711 Terminology Relating to Electrical InsulationD1830 Test Method for Thermal Endurance of FlexibleSheet Materials Used for Electrical Insulation by theCurved Electrode MethodD5032 Practice for Maintaining Constant Relative Humidityby Means of Aqueous Glycerin SolutionsD6054 Practice for Conditioning Electrical Insulating Mate-rials for Testing(Withdrawn 2012)3E104 Practice for Maintaining Constant Relative Humidityby Means of Aqueous Solutions3.Terminology3.1 DefinitionsFor definitions of terms used in these testmethods,see Terminology D1711.4.Sampling4.1 Sample shipments of material as specified below,andwhere possible take only one sample from any package.4.1.1 FabricOver 3 in.(75 mm)in width.4.1.1.1 RollsSelect one roll from each ten rolls or fractionthereof in a shipment of full-width fabric.Cut off not less than1These test methods are under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and are the direct responsibility ofSubcommittee D09.07 on Flexible and Rigid Insulating Materials.Current edition approved Nov.1,2013.Published December 2013.Originallyapproved in 1957.Last previous edition approved in 2007 as D1458 01(2007).DOI:10.1520/D1458-13.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 two turns of fabric from each roll selected from sampling,andselect sample material for the preparation of test specimensfrom the remaining layers of the roll.4.1.1.2 SheetsSelect one sheet from each 50 sheets orfraction thereof in a shipment of sheeted fabric.Remove notless than six sheets from the outer layers of each package ofsheets selected from sampling,and then select sample materialfor the preparation of test specimens from the remainingsheets.4.1.2 Tapes and Strips3 in.(75 mm)and less in width.4.1.2.1 TapesCut off not less than six turns of tape fromeach roll selected for sampling,and then select sample materialfor the preparation of test specimens from the remaining layersof the roll.Select rolls of tape in accordance with the followingschedule:Number of Rolls in ShipmentMinimum Number of SampleRollsOver 10 0001 per 10005001 to 10 000102001 to 50005Less than 200024.1.2.2 StripsSelect