PosiTest PullOff Adhension Tester InstructionManual.docx
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PosiTest PullOff Adhension Tester InstructionManual.docx
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PosiTestPullOffAdhensionTesterInstructionManual
PosiTestPull-OffAdhesionTester
INSTRUCTIONMANUALv.3.0
PosiTestAT
(manual)
PosiTestAT-A
(automatic)
Simple.Durable.Accurate.
Introduction
Theportable,hand-operatedPosiTestPull-OffAdhesionTestermeasurestheforcerequiredtopullaspecifiedtestdiameterofcoatingawayfromitssubstrateusinghydraulicpressure.ThepressureisdisplayedonadigitalLCDandrepresentsthecoating'sstrengthofadhesiontothesubstrate.
InaccordancewithASTMD4541,D7234,ISO4624andothers,thePosiTestevaluatestheadhesion(pull-offstrength)ofacoatingbydeterminingthegreatesttensilepull-offforcethatitcanbearbeforedetaching.Breakingpoints,demonstratedbyfracturedsurfaces,occuralongtheweakestplanewithinthesystemconsistingofthedolly,adhesive,coatinglayersandsubstrate.
NOTE:
Throughoutthismanual,theWsymbolindicatesmoreinformationabouttheparticulartopicorfeatureisavailableonourwebsite.Goto:
BasicstepsfortestingcoatingadhesionwithaPosiTestAdhesionTester:
1.Dolly&CoatingPreparation
Thedollyandthecoatingarecleanedandabraded.(seepg.4)
2.Adhesive&DollyApplication
Theadhesiveispreparedandappliedtothedolly.Thedollyisthenadheredtothecoatedsurfaceandtheadhesiveisallowedtocure.(seepg.4)
3.TestAreaSeparation-Optionalstep
Thetestareaofthecoatingisseparatedfromtheareasurroundingthedollybycuttingordrilling.(seepg.5)
4.Pull-offTest
a)PosiTestAT(manual)(seepg.6)
b)PosiTestAT-A(automatic)(seepg.8)
5.AnalysisofTestResults
Thedollyandthecoatingareexaminedandevaluatedtodeterminethenatureofthecoatingfailure.(seepg.10)
6.StorePull-OffTestResults-Optionalstep
ThePosiTest'sinternalmemorystoresmaximumpullpressure,pullrate,testdurationanddollysizeforupto200pulls.(seepg.10)
Step1:
Dolly&CoatingPreparation
DollyPreparation
1.Toremoveoxidationandcontaminants,placetheincludedabrasivepadonaflatsurfaceandrubthebaseofthedollyacrossthepad4-5times.
2.Asrequired,removeresidueleftfromtheabradingprocessusingadryclothorpapertowel.
CoatingPreparation
1.Lightlyroughenthecoatingusingtheincludedabrasivepad.
NOTE:
Ascoatingabrasionmayintroduceflaws,itshouldonlybeusedwhennecessarytoremovesurfacecontaminants,orwhenthebondstrengthbetweentheadhesiveandthecoatingisinsufficientforpulltesting.
2.Topromotethebondbetweenthedollyandthecoating,degreasetheareaofthecoatingtobetestedusingalcoholoracetonetoremoveanyoil,moistureordust.
NOTE:
Ensurethatanyalternativeabrasiontechniques,degreasersoradhesivesdonotalterthepropertiesofthecoating.Testbyapplyingasmallamountofdegreaseroradhesivetoasampleareaandobservingeffects.
Step2:
Adhesive&DollyApplication
AdhesiveSelection
TheadhesiveincludedinthePosiTestAdhesionTesterkithasbeenselectedduetoitsversatility.Thisadhesivehasminimalimpactonavarietyofcoatingsandhasatensilestrengthexceedingthemaximumperformancecapabilitiesofthepressuresystemunderidealconditions.Otheradhesivesmaybepreferredbasedonrequirementssuchascuretime,coatingtype,workingtemperatureandpull-offstrength.Quickcuringone-partcyanoacrylates(superglues)maybesufficientforpaintedsurfaces,buttwo-partepoxiesarepreferredforporousorroughcoatings.
DollyApplication
1.Mixtheadhesivepermanufacturer'sinstructionsandapplyauniformfilmofadhesiveonthebaseofthedolly(approximately2-4milsor50-100micronsforbestresults)
2.Attachthedollytothepreparedcoatingtestarea.
NOTE:
Ifthecoatedsurfacetobetestedisoverheadorvertical,ameanstoholdthedollyinplaceduringthecuretimemayberequired,i.e.removabletape.
3.Gentlypushdownonthedollytosqueezeoutexcessadhesive.Donottwistorslidethedollybackandforthonthecoatingasairbubblesmaybegenerated.
4.Carefullyremoveexcessadhesivefromaroundtheedgesofthedollywithincludedcottonswabs.
5.Allowtocurepertheadhesivemanufacturer'sinstructions
NOTE:
Manyadhesivescurefasterandprovideastrongerbondwhencuredwithheat.Similarly,coldenvironmentsmaycausealongercuretimeandweakerbondstrength.
Step3:
TestAreaSeparation
Thedecisionofwhentocutaroundadollyisdependentonthestandard,specificationorcontractualagreementtowhichthetestistocomply.Theprimarypurposeforcuttingthroughthecoatingistoisolateaspecificdiametertestarea.Whenthedecisiontocutintothecoatinghasbeenmade,itisrecommendedtocutallthewaythroughtothesubstrate.Asaminimum,itissuggestedtocarefullycutawayexcessadhesivefromthedollyapplicationprocess.Thistypicallypreventsalargerareaofcoatingfrombeingpulledawayfromthesubstrate,resultinginahigherpull-offpressure.
CuttingInstructions
1.Cutthroughthecoatingaroundtheedgesofthedollywiththeincludedcuttingtool,removinganyexcessadhesive.
2.Clearawayanydebrisfromthecuttingprocess.
NOTE:
-Cuttingmayinducecoatingsurfaceflawssuchasmicrocrackingthatmayaltertestresults.
-Forcoatingswithstronglateralbondingitisrecommendedtocutcompletelythroughthecoatingdowntothesubstrate.
DrillingTemplate(W)
Whentestingverythickcoatings,anoptionaldrillingtemplatemaybepreferred.
Step4a:
Pull-offTest(PosiTestATManual)
ThePosiTestATpowers-upanddisplaysdasheswhenthe()buttonispressed.Topreservebatterylife,theinstrumentpowersdownafter5minutesofnoactivity.
QuickGuide
(1)Openthepressurereliefvalvecompletely(turncounterclockwise)
(2)Connecttheactuatortothedolly
(3)Closethepressurereliefvalvecompletely(turnclockwise)
(4)Zero-PresstheZerobutton.
(5)Pumppressureintothesystemuntilthedollypullsthecoatingaway
1.Ensurethepressurereliefvalveonthepumpiscompletelyopen,(turncounterclockwise)
2.Pushtheactuatorhandlecompletelydownintotheactuatorassembly.Placetheactuatorassemblyoverthedollyheadandattachthequickcouplingtothedollybyreachingthroughtheholesintheactuatorassemblyandliftingthequickcoupling.Releasethequickcouplingwhenthedollyheadiscompletelyengaged.
3.Closethepressurereliefvalveonthepumpcompletely,(turnclockwise)
Note:
Asrequired,verifyandadjustthedollysizebypressingthe()button.Selectthepressureunitsbypressingthe()button.Theinstrumentwillmaintaintheseadjustmentsevenafterthe()buttonispressed.
4.ZerotheinstrumentBEFOREpumpingbypressingthe()button.Thispreparestheinstrumentforthetestbyclearingthedisplay,andzeroingtheinstrument.
5.Primethepumpslowlyuntilthedisplayedreadingapproachestheprimingpressure.Theprimingpressureisthepointthattheinstrumentbeginscalculatinganddisplayingthepullrate.Itisalsothepressureatwhichtheabilitytostorereadingsisenabled.Primingpressuresforthevariousdollydiametersare:
10mm400psi2.8MPa
14mm200psi1.4MPa
20mm100psi0.7MPa
50mm50psi0.4MPa
NOTE:
Foroptimumresults,priortoexceedingtheprimingpressure,returnthepumphandletoitsfulluprightpositionandthencompleteasinglestrokeatthedesiredpullrateuntiltheactuatorseparatesthedollyfromthecoating.
6.Openthepressurereliefvalveandremovethedollyfromtheactuatorassembly.
7.Readingsmaybestoredintomemorybypressingthe()button(pg.10).
Troubleshooting(PosiTestAT)(w)
Digitaldisplay"freezes"atalowvalue
TheTesterusesasuddendropinactuatorpressureasanindicationthatthedollyhasbeenpulledfromthesurface.Theteststopsandthehighestpressureremainsonthedisplayforeasyviewingandrecording.Pumpinguppressuretooquicklyatthebeginningofatestcancauseasuddenpressurepulse,foolingtheTesterintothinkingthetestiscomplete.Ifthishappens,restartthetestbyopeningthepressurereliefvalve,closingit,thenpressingthe()button.Formoreinformation,seeStep5above.
Step4b:
Pull-OffTest(PosiTestAT-AAutomatic)
QuickGuide
(1)Connecttheactuatortothedolly
(2)Power-upwiththe[)button
(3)Verifymeasurementunits,dollysizeandpullrate
(4)Readytheinstrumentwiththe[)button
(5)Testwiththe[)button
1.Placetheactuatorassemblyoverthedollyheadandattachthequickcouplingtothedollybyreachingthroughtheholesintheactuatorassemblyandliftingthequickcoupling.Releasethequickcouplingwhenthedollyheadiscompletelyengaged.
2.Pressthe[[buttontopower-uptheinstrumentifnecessary.Theinstrumentwillpower-downafter5minutesofnoactivityorbyholdingthefpffiffbuttonfor2seconds.
3.Checksettings:
(a)Verifydisplayedmeasurementunits.Changewiththejpd/MP4buttonifnecessary.
(b)Verifydollysizewiththe^-Jbuttonandchangeifnecessary.
(c)VerifypullratewiththeBHIBbuttonandchangeifnecessary.Thefollowinguserselectableratesareavailable:
DollySize
PSIRates
MPaRates
10mm
125,200,400,600,725
1.00,2.00,3.00,4.00,5.00
14mm
60,100,200,300,360
0.40,0.70,1.40,2.00,2.50
20mm
30,50,100,150,180
0.20,0.30,0.70,1.00,1.20
50mm
5,8,16,24,30
0.04,0.08,0.12,0.16,0.20
4.Pressthe[JbuttontoreadytheInstrument.ThispreparesthePosiTestforthetestbyclearingthedisplayandzeroingtheinstrument.
5.Pressthe[Jbuttonagaintostartthetestthatconsistsof4stagesthatoccurautomatically:
Stage1.Initiat
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- PosiTest PullOff Adhension Tester Instruction Manual
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