ASTM_D_2381_-_87_1999e1.pdf

Designation:D 2381 87(Reapproved 1999)e1An American National StandardStandard Test Methods forFlexible Composite Materials Used for Electrical Insulation1This standard is issued under the fixed designation D 2381;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.e1NOTEEditorial changes were made throughout in November 1999.1.Scope1.1 These test methods cover procedures for testing flexiblematerials consisting of two or more insulating componentscombined to form a composite to be used as an electricalinsulation.1.2 The procedures appear in the following order:ProcedureSectionASTM ReferenceMethodBreaking Strength24 to 30D 202,D 1458Conditioning4.Dielectric BreakdownVoltage9 to 15D 149,D 295Tearing Resistance31 to 36D 689,D 827,D 1004Thickness5 to 8D 374Volume Resistivity16 to 23D 2571.3 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.A specific warningstatement is given in 13.2.2.Referenced Documents2.1 ASTM Standards:D 149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power Frequencies2D 202 Test Methods for Sampling and Testing UntreatedPaper Used for Electrical Insulation2D 257 Test Methods for DC Resistance or Conductance ofInsulating Materials2D 295 Test Methods for Varnished Cotton Fabrics Used forElectrical Insulation2D 374 Test Methods for Thickness of Solid Electrical Insu-lation2D 689 Test Method for Internal Tearing Resistance of Pa-per3D 827 Test Method for Edge Tearing Strength of Paper4D 1004 Test Method for Initial Tear Resistance of PlasticFilm and Sheeting5D 1458 Test Methods for Fully Cured Silicone Rubber-Coated Glass Fabric and Tapes for Electrical Insulation2D 1711 Terminology Relating to Electrical Insulation2D 6054 Practice for Conditioning Electrical Insulating Ma-terials for Testing63.Terminology3.1 Definitions:3.1.1 For definitions of terms used in these test methods seeTerminology D 1711.4.Conditioning4.1 Unless otherwise specified in the individual specifica-tion,condition test specimens for the time specified in 4.1.1 or4.1.2 in the standard laboratory atmosphere of Practice D 6054at the tightened tolerances of 62%relative humidity and61C.Conduct tests immediately after removal from theconditioning room or chamber.In matters of dispute,4.1.1shall be considered the referee procedure.4.1.1 Condition for 96 h.4.1.2 Condition for 48 h.1These test methods are under the jurisdiction of ASTM Committee D-9 onElectrical and Electronic Insulating Materials and are under the jurisdiction ofSubcommittee D09.19 on Dielectric Sheet and Roll Products.Current edition approved March 27,1987.Published May 1987.Originallypublished as D 2381 65 T.Last previous edition D 2381 81.2Annual Book of ASTM Standards,Vol 10.01.3Annual Book of ASTM Standards,Vol 15.09.4Discontinued,see 1981 Annual Book of ASTM Standards,Vol 15.09.5Annual Book of ASTM Standards,Vol 08.03.6Annual Book of ASTM Standards,Vol 10.02.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.THICKNESS5.Significance and Use5.1 The importance of space factor,particularly in slot celldesign and in other electrical equipment,makes proper deter-mination of thickness essential.5.2 Some properties,such as dielectric breakdown,varywith the thickness of the material;and certain properties suchas volume resistivity cannot be determined without a knowl-edge of thickness.6.Test Specimens6.1 In the case of rolls or sheets,across the entire width cuta specimen 1 in.(25.4 mm)wide.6.2 In the case of tapes,the specimens shall be 36 in.(920mm)long.7.Procedure7.1 Measure the thickness in accordance with Test MethodsD 374,with the following modifications:7.1.1 Raise the presser foot the distance necessary to allowfree movement of the specimen from measurement to measure-ment position.Carefully lower the presser foot this distance.7.1.2 Use Methods C or D unless otherwise agreed uponbetween the user and supplier.7.1.3 In the case of rolls and sheets,take ten measurementsequally spaced across the width of the specimen.The thicknessof the material shall be the average of the ten measurements.7.1.4 In the case of tapes,unless otherwise specified,taketen measurements equally spaced along the length of eachspecimen.The thickness of the tape shall be the average of theten measurements.7.1.4.1 Test Method D 374 prohibits the measurement ofthi