1、 ASTM D2443 95 0759530 O566754 658 W Federation of Societies for Paint Technology Standard NO.Lf 3-87 AMERICAN SOCIETY FOR TESTING AND MATERIALS 191 6 Race St.Philadelphia,Pa 191 03 Reprinted from the Annual Book of ASTM Standards.CopyrigMASm If not listed in the current combined index,will appear i
2、n the next edition.Designation:D 2443-95 Standard Test Methods for Lacing Twines and Tapes Used as Harnesses in Electrical Equipment This standard is issued under the fixed designation D 2443;the number immediately following the designation indicates the year of original adoption or,in the case of r
3、evision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(c)indicates an editorial change since the last revision or reapproval.1.Scope 1.1 These test methods cover procedures for braided and nonbraided fiber lacing and tying twines and tap
4、es used to secure electrical harnesses,armatures,and similar apparatus.Both round twines and flat narrow tapes made from syn-thetic or natural fibers are included,and either may or may not be coated with waxes,resins,or elastomers.1.2 The procedures appear as listed in the first column:ASTM Method P
5、rocedure Sections Reference Sampling Conditioning Weight(Yield)Breaking Strength and Knot Strength or Knot Slip Resistance Volatile Content Thickness and Width of Lacing Tapes and Diam-eter of Twines Wax Content Fiber Identification Elastic Properties Braid Pick of Lacing Tapes creep 3 4 5 to 13 14
6、to 19 20 to 21 28 to 35 36 to 42 43 to 45 46 to 53 54 to 61 62 to 68.D 123,D 1907 D 16.D 314.D 276.1.3 The values stated in inch-pound units are to be regarded as the standard.1.4 This standard does not purport to address all o f the safety concerns,if any,associated with its use.It is the responsib
7、ility of the user ofthis standard to establish appro-priate safty and health practices and determine the applica-bility of regulatory limitations prior to use.Specific hazard statements are given in Section 37.2.Referenced Documents 2.1 ASTM Standards:D 76 Specification for Tensile Testing Machines
8、for Tex-D 123 Terminology Relating to Textiles2 D276 Test Methods for Identification of Fibers in Tex-D374 Test Methods for Thickness of Solid Electrical tiles*tiles2 insulation3 1 These methods are under the jurisdiction of ASTM Committee D-9 on Electrical and Electronic Insulating Materials and ar
9、e under the direct responsi-bility of Subcommittee W9.07 on Flexible and Rigid Insulating Materials.Current edition approved May 15,1995.Published July 1995.Onginally published as D 2443-65 T.Last previous edition D 2443-90.2 Annual Book of ASTM Standards,Vol 07.01.3 Annual Book of ASTM Standards,Vo
10、l 10.0 I.D739 Methods of Testing and Tolerances for Spun,Twisted,or Braided Products Made from Flax,Hemp,Ramie,or Mixture Thereof4 D 1000 Test Methods for Pressure-Sensitive Adhesive-Coated Tapes Used for Electrical and Electronic Applications3 D1907 Test Method for Yam Number by the Skein Method2 E
11、 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specificationss 3.Sampling 3.1 For purposes of sampling,a lot shall consist of all twine or tape of the same type,color,and size treated in one production run and offered for inspection at one time.3.2 From each lot
12、 of material,two spools or tubes or 2 9%of the total spools or tubes,whichever is greater,shall be randomly selected,and the tests prescribed shall be made on specimens cut from the sampled spools.4.Conditioning 4.1 All specimens shall be conditioned to equilibrium moisture content by exposure in ai
13、r at a temperature of 2 1 i 1.1C and a relative humidity of 65 f 2%,unless otherwise specified herein or unless otherwise agreed upon by the supplier and the consumer.Equilibrium shall be taken as that point where two successive weighing made not less than 4 h of conditioning apart show not more tha
14、n O.1 9%change in weight.YIELD 5.Terminology 5.1 Definitions:5.1.1 The definitions of all terms employed in these test methods shall be in accordance with Terminology D 123.6.Significance and Use 6.1 This test provides a convenient method of deter-mining the yield of lacing material as well as an ap
15、proxima-tion of the amount of impregnating material present in lacing twines.Procedure A-Skin Me!hod 7.Procedure 7.1 Determine the yield in accordance with Test Method Discontinued,see 1971 Annual Book ofASTM Standards,Part 25.Annual Book ofASTM Standards,Vol 14.02.1 NOTICE:This standard has either
16、been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.ASTM D2i.143 95=0759530 05bb755 59Y W(m D2443 D 1907,using Option 1 except that the skein length shall be 30 yd(27.4 m)and a skein reel with a perimeter of 90 in.(2286 mm)may be used.ProCrdure B-Sede Measurement 8.Apparatus /3 2 in.(1-mm)divisions.9.Test Specimens 9.1 Three specimens,free of folds,crushing,or abnormal distortion,shall be selected at random to be repres
