1、Designation:D6912Standard Test Methods forFriction Tapes1This standard is issued under the fixed designation D69;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of l
2、ast reapproval.Asuperscriptepsilon()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 the methods and proceduresfor testing friction tapes.Such tapes consist of
3、 a woven fabricsheeting that has been impregnated with an adhesive insulatingcompound and cut into rolls of narrow width.These tapes arecommonly used for protecting and binding in place,insulationapplied to joints of electrical wires and cables,and for othermechanical purposes.NOTE1The material spec
4、ifications formerly included in these testmethods are now contained in Specification D4514.1.2 The test methods included in this standard are asfollows:SectionsAdhesion6 11Aged Adhesion12 17Breaking Strength18 23Dielectric Breakdown Voltage24 29Dimensions30 35Discoloration of Copper36 40Parallelism4
5、1 451.3 The values stated in inch-pound units are the standard.The SI units in parentheses are for information 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 sa
6、fety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE2There is no equivalent IEC standard.2.Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Com
7、mercial Power FrequenciesD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD1711 Terminology Relating to Electrical InsulationD4514 Specification for Friction TapeD5423 Specification for Forced-Convection Laboratory Ov-ens for Evaluation of Electrical InsulationD6054 Practi
8、ce for Conditioning Electrical Insulating Mate-rials for Testing(Withdrawn 2012)33.Terminology3.1 Definitions:3.1.1 Fordefinitionsofothertermsusedinthisspecification,refer to Terminology D1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 adhesion,nthe resistance of the tape to unwind its
9、elfafter being wound up under pressure,in accordance with thistest method.3.2.2 breaking strength,nthe force required,per unitwidth,to break the tape when tested in accordance with thistest method.3.2.3 conditioning,nthe exposure of the tape to theinfluence of a prescribed atmosphere for a stipulate
10、d period oftime.3.2.4 length of tape in a roll,nthe number of linear yardsor metres of tape wound into a roll as measured in accordancewith this test method.3.2.5 parallelism,nthe difference in width between twomated ends of a tape that has been split in half,in accordancewith this test method.3.2.6
11、 tackiness,nthe adherence of the friction tape sur-faces to themselves after light contact has been made,inaccordance with this test method.4.Sampling4.1 The producer and consumer shall agree upon the num-ber of rolls selected.Unless otherwise specified a minimum ofthree rolls per lot shall be teste
12、d.1These 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 April 1,2012.Published April 2012.Originallyapproved in
13、1920.Last previous edition approved in 2006 as D69 06.DOI:10.1520/D0069-12.2For 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
14、 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 4.2 For sampling purposes,a lot
15、consists of identifiablematerials of the same type manufactured in one production runand offered for delivery at the same time.4.3 Test each sample roll for conformance to all the require-ments of the specification.4.4 Remove and discard at least 24 in.(610 mm)of the outerlayer of each sample roll b
16、efore taking test specimens.4.5 Unwind the test specimen from the roll at a slow,uniform rate without jerking.5.Conditioning5.1 Unless otherwise specified,condition the rolls for 16 hin a standard laboratory atmosphere as specified in PracticeD6054.5.2 Unless otherwise specified,condition the test specimensfor 1 h in a standard laboratory atmosphere as specified inPractice D6054.ADHESION TEST6.Significance and Use6.1 In most applications,a friction tape must have adequateadhesion to remain in pl
