ASTM_D_2148_-_13.pdf

Designation:D214813Standard Test Methods forBondable Silicone Rubber Tapes Used for ElectricalInsulation1This standard is issued under the fixed designation D2148;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.1.Scope*1.1 These test methods cover tests for bondable siliconerubber tapes which form a sealed structure either with theapplication of heat(and pressure if needed)or by the processof auto-adhesion(self-fusing).1.2 The methods appear in the following sections:Test MethodSectionAdhesion3 9Bond Strength10 17Dielectric Breakdown Voltage18 25Hardness40Length32 and 33Thickness26 31Width35 391.3 The values stated in inch-pound units are to be regardedas standard,except for C.The values in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.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.For a specifichazard statement see 22.1.1.2.Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD374 Test Methods for Thickness of Solid Electrical Insu-lation(Withdrawn 2013)3D1000 Test Methods for Pressure-Sensitive Adhesive-Coated Tapes Used for Electrical and Electronic Applica-tionsD1458 Test Methods for Fully Cured Silicone Rubber-Coated Glass Fabric and Tapes for Electrical InsulationD2240 Test Method for Rubber PropertyDurometer Hard-nessD6054 Practice for Conditioning Electrical Insulating Mate-rials for Testing(Withdrawn 2012)32.2 ASTM Adjuncts:Tack tester(one drawing)4ADHESION3.Scope3.1 This test method covers the determination of the self-adhesion of unsupported,self-fusing silicone rubber rectangu-lar and taper-edge(Note 1)tape designed for use as electricalinsulation.NOTE1Taper-edge tape includes such cross sections as triangular,lens,etc.4.Significance and Use4.1 Self-adhesion is a primary initial property since it affectslayer-to-layer bonding.The integrity of the bond can signifi-cantly affect the electrical and physical performance of theinsulation system.Therefore,the degree of self-adhesion isdirectly related to apparatus performance.4.2 A high degree of self-adhesion is desirable for mostelectrical applications.In this test,a short unwinding lengthindicates a high degree of self-adhesion.4.3 This test method has been found useful as a qualitycontrol test for lot acceptance.5.Apparatus5.1 Inclined Mandrel Tack Test Fixture A suggested fix-ture is shown in Fig.1.4The mandrel shall consist of a58-in.1These 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 November 2013.Originallyapproved in 1963.Last previous edition approved in 2008 as D2148 02(2008)1.DOI:10.1520/D2148-13.2For 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.4Available from ASTM International Headquarters.Order Adjunct No.ADJD2148.Original adjunct produced in 1965.*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(15.9-mm)diameter aluminum rod mounted in low-frictionbearings.Good alignment of bearings is necessary for accurateresults.When properly assembled,the mandrel shall turn freelywhen loaded with a 1-oz(30-g)weight suspended from acotton thread wound in a single layer at the center of themandrel.5.2 Weights,as specified in Section 7 and means forattachment.6.Test Specimen6.1 A test specimen shall consist of two pieces of tape 12 to15 in.(300 to 380 mm)long.Divisions spaced 1 in.(25.4 mm)apart shall be marked off on one piece of tape.If tapes containan interliner,the interliner shall be removed just prior towrapping the mandrel.Dirt and other forms of contaminationshall be avoided.7.Procedure7.1 WindingHalf lap the unmarked specimen perfectly onthe mandrel of the test fixture,using the suggested weight asshown in Table 1.These weights are not critical.However,theyare necessary to get intimate contact and conformability of thetape.To obtain perfect half lapping,tilt the tack tester at ana