ASTM D6195-97
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5.5TestMethodB(usingLoopTackTester)makesuseofa
specimenstripfivein.(125mm)inlength.Thatistheonly
lengthspecimenstripthatfitsproperlyinthelooptacktester.
5.6Iftheadhesiveisnotalreadyotherwisecoated,thesetest
methodsincorporatetheuseofaclear2mil(0.05mm)
polyester(PET)filmbackingforspecimenpreparation.Useof
otherbackingmaterialschangesperformanceofthespecimen
tobetested.
TESTMETHODA(UsingaTensileTester)
6.Apparatus
6.1TensileTester—Aconstantrateofextensiontype.
6.2TestFixture(Fig.1orFig.28)—Tobemountedintothe
jawsofthetensiletester.Apanelheldbythetestfixtureallows
fora1in.2(25by25mm)contactareaofthepressure-sensitive
article.Alternately,thetestfixturemayincludearaisedarea
thatallowsa1in.2(25by25mm)contactareaofthe
pressure-sensitivearticle.
6.2.1Thepanelortheraisedareaofthetestfixtureis
stainlesssteelasspecifiedinSpecificationA666.
6.3ApparatusforCutting:
6.3.1DieCutter—A1by7in.(25by175mm)rectangular
mallet-typediecutterwithmalletforsamplepreparation.
6.3.2Ifafixeddimensiondieisunavailable,substitutea
1-in.(25-mm)steelbarwithadoublerazorknifeorother
apparatussuitableforcuttingthespecimenintothespecified
dimensionstopreparethe1in.(25mm)widespecimenstrips.
6.4AbsorbentLint-FreeCleaningMaterial—Materialspro-
ducedfromentirelyvirginrawmaterialsandcontainingless
than0.25%byweightofsolvent-leechablematerials.
6.5MaskingTape—1in.(25mm)wide.
6.62mil(0.05mm)PETFilm—Tobeusedasasupport
mediuminevaluatingunsupportedadhesivessuchastransfer
tapes,laminatingadhesives,orotherfree-filmadhesives.
6.7Reagents—Appropriatereagentsincludeacetone,diac-
etonealcohol,n-heptaneandtoluene,reagentoranalytical
grade,oranethanolcleanerforwater-basedadhesives.
7.SamplePreparation
7.1Cutsampleinto1by7in.(25by175mm)specimen
stripsinthemachinedirection(whenknown)ofthepressure-sensitivearticle.Useofstripsofotherlengthsmaychange
results.Cutatleastthreespecimenstripsforeachadhesiveto
betested.
NOTE1—Iftransferorunsupportedadhesivesaretobetested,thesearetobelaminatedto2mil(0.05mm)PETfilm,usedasanadhesivesupport,priortocuttingthesamplesintothe1by7in.(25by175mm)specimenstrips.
7.2Conditionspecimenstobetestedforatleast24hina
testingroomat73.463.6°F(2362°C)andarelative
humidityof5065%,inaccordancewithSpecificationE171,
priortoconductingthetest.
8.Conditioning
8.1TestingRoom—Testinastandardlaboratoryatmo-
sphere,at73.463.6°F(2362°C)andarelativehumidityof
5065%,inaccordancewithSpecificationE171.
9.Procedure
9.1Ensurethatthetensiletesteriscalibratedaccordingto
instructionssuppliedbythemanufacturer.
9.2Settheinstrumentcrossheadspeedat12in.(300
mm)/min.
9.3Placethetestfixtureinthelowergripofthetensile
tester.Itisimportantthatthetestfixturebelevelandstraight
inthelowergrip.SeeFig.1,Fig.2andFig.3.
9.4Setgapsforthecrossheadusingtheminimumand
maximumgapsettingontheextensioncycle.Setgaps160.05
in.(2561mm)(critical)and460.1in.(10063mm)
(optional)fromthebottomoftheuppergripstothefaceofthe
stainlesssteelportionofthetestfixturewhenthetestfixtureis
lockedinthelowergrips.Setthechartrecorderspeedfor2in.
(50mm)/min.Setthechartrecorderloadscaleto20lb(90N)
fullscale.
9.5Cleanthestainlesssteelportionofthetestfixture(the
areathepressure-sensitivearticlewillcontact)priortouse
8AvailablefromChemInstruments,510CommercialDrive,Fairfield,OH45014-7593.
FIG.1LoopTackTestFixture
1FIG.2LoopTackTestFixture2
FIG.3LoopTackSampleDuring
Testusingreagent(s)from6.7.Useabsorbent,lint-freecleaning
material.Useaseparatepieceofcleaningmaterialeachtime.
Repeatforatotalofthreewashesafterthetestfixtureappears
clean.Allow2mintoelapseaftercleaningtoensurecomplete
evaporationofthecleaningsolvent.Theusermustensurethat
thecleaningmethodusedremovesallresiduefromthetest
fixture.Thewater-breaktest,describedinGuideD2651,may
beusedtoverifycleanliness.
9.6Completelyremovethereleaseliner(ifthepressure-
sensitivearticlenormallyincludesareleaseliner)fromthe
specimen.
9.7Bendthespecimencompletelybackonitself,being
carefulnottocreaseit.Thespecimenformsateardropshaped
loopwiththeadhesivesurfacefacingout.
9.8Fastentheendsofthelooptogether,usingastripof
maskingtape1in.(25mm)wide(Fig.4).Themaskingtape
coverstheendsoftheloop,preventingcontaminationofthe
gripsofthetensiletester.
9.9Insertthetapedendofthespecimenloopintotheupper
gripssothatthebottomedgeofthemaskingtapeisevenwith
thebottomedgesofthegrips.
9.10Turnonthechartrecorder.Activatethetensiletesterso
thatthecrossheadmovesdownward.Themid-sectionofthe
specimenloopmustcontactthecenterofthestainlesssteel
portionofthetestfixture.Whenthecrossheadreachesits
minimumposition,itwillimmediatelyswitchdirectionand
moveupward.Whenthecrossheadisatitsminimumposition,
thespecimenloopwillcompletelycoverthe1in.(25mm)area
ofthestainlesssteelportionofthetestfixturewithout
excessive“hang-over”oftheedges.
NOTE2—Ifthetensiletesterdoesnothaveautomaticcycling,cyclingmustbedonemanually.