EZIFIX SPRINGSTEELFASTENERSANDADHESIVES
Furtherinformationandassistance
Oneofthefirstconcernsistheretentionoftackandadhesionafterexposureto
elevatedtemperatures.Foamagedformorethan5yearsat150°Fretained92%
Ezifixisaninnovativeadhesivesystemandsupportingdataforitsusageis
ofitspeeladhesionwithinitialtackandlinerreleasestillexcellent.Thedifference
providedhere.
inpeelvaluesuggeststhatthismaterialisrelativelyunaffectedbylongterm
VHBDurabilityinEzifix®FastenerApplications
exposuretoelevatedtemperatures.Bondscantolerateperiodic,short-term
exposurestotemperaturesupto300°F.
TheEziFix®FasteningSystemshavebeensuccessfullyusedintheconstruction
industryforanumberofyearstoreplaceconventionallydrilledfrictionhangers.
AcceleratedAgeing
Asthisisaworldfirst,therearenopredecessorsforsimilartypesofbonding.3M
Acceleratedageingtestshavebeenconductedinweather-o-meters,which
VHB™AcrylicFoamTapehasundergonerigorousagetestingandapplication
subjectabondtoheathumidityandconcentratedultravioletexposure.Thetests
durabilitytestingsinceitsdevelopment20yearsago.Theresultsofthesetests
wereperformedindynamicshearandthesamplesweresubjectedtocycling
clearlydemonstrateitsuniqueperformancecapabilities.Throughtheuseof heat,humidityandcarbonarclampexposure.Smallsamplesprovidedan
EziFixFX-10Primer,VHBtapewillformapermanentbondtoconcreteinaddition increasedamountofedgeexposuretoUVradiation.Thebondstrengthdidnot
toarangeofothersurfaces.
deterioratebelowitsoriginalperformancelevelafterexposureto7000hoursin
theweather-o-meterunderthesetests.WeatheringdecksinArizona,Floridaand
Durability otherplacesaroundtheworldareusedtocollectdataonlong-termperformance
ThepolymerconstructionofVHBtapehaslongtermagingresistance,which
ofacrylicfoam.Theseteststypicallydemonstrateabout100%bondstrength
preventsanyweakeningoftheproductovertime.Acrylicfoamtapeformsits
retentionafter2-5yearsageingcyclesinthehothumidconditionsofFlorida,the
maximumbondtoasurfacewithin72hours.Thishigh-levelbondstrengthwill
hotdryandverysunnyclimateofArizonaandthecoldtohotextremesof
Minnesota.Theacrylicshavestoodupwellintests,basedonMILSTD833,
remainforthelifeoftheapplication.Thelongtermagingresistanceliesinthe
whicharecommonlyusedtoqualifydurableproductsfortheelectronicsindustry.
polymercomprisingtheadhesivefoammaterial.Thechemicalbonds,which
Underthistestingprotocolbondsaresubjectedto1000hoursofthermalat
makeupthepolymerchains,consistofcarbon-carbonsinglebonds,whichare
150°C,1000hoursat85°Cand85%relativehumidityand1000hoursofthermal
highlyresistanttoenergyintheformofheatorultravioletlightaswellaschemical
shockwhichcycleshourlyfromfrom-50°Cto150°C.Typicallythebondstrength
attack. In less durable foams or adhesives, such conditions could lead to
increasesovertimeduetothehighperformancePSA’smorecompletewetout
cleavingthepolymerbackboneandthusaweakeningofmechanicalproperties. ofthesurfaces.Adhesiontestshavebeenperformedonacrylicbondswhich
In the case of acrylic foam, however, additional cross-linking is chemically weresubjectedto6yearssubmersionin5%saltwaterandordinarytapwater.
favouredoverchainscission(cleavage).Thismeansthatratherthanundergoing
Acombinationofadhesiveandcohesivefailuremodeswasobservedwhenthe
aprocessofdecomposition;theacrylatematerialswilltendtobuildmodulus
bondwasbrokenwhichindicatedveryhighperformancelevels.Longterm
veryslightlyoverextendedexposures.Thistranslatestoastrongerlongerlasting
exposuretohighhumidityorwatersubmersioncanhavetheeffectofmakinga
bond.Theuseofglassmicrosporesasareinforcingagentandmeansofdensity
polymermoreresilientandtolerantofhighelongation.Asubsequentloweringof
reductionmakestheconstructioninherentlymoreresistanttomoistureand
peakforceisalsomeasuredaftermanydaysofexposureusuallyoftheorderof
chemicalsthanwithcellularairpockets.Poorsurfacepreparation/application
40%.Thiseffectistypicalasitparallelstheincreaseinresilienceandisthesame
trendseenwithstructuralsiliconmaterialsalsorecognisedfortheirdurability.
techniquemaycausetheapplicationtofail;however,bondweakeningwillbe
Dryingofthebond,whichoccursinanormalenvironmentalcycle,willshowthat
evidentwithinthefirst72-hourperiod.Therecommendedtensileloadfor4951
thiseffectisreversibleandthebondwillreturntotheusualdrystrength.After
VHB tape is 110lbs/sq.inch (706Kpa). This load capability far exceeds the
splashesorincidentalcontactwithsolventssuchasfuels,alcohols,adhesive
requirementinananchorapplication.Withcorrectapplicationtechnique3M
removerslikeMEK,andevenweakacidsorbases,noeffectismeasuredonthe
VHB™tapewillmaintainbondstrengthforthelifeoftheapplication.Becauseof
bondperformance.Onlyaftercontinuoussubmersioninharshfuelsorsolvents
thedemandinganddiverseapplicationsfortheacrylicfoammaterial,durability issofteningofthefoamexperienced.Whiletheproductmaywithstandoccasional
hasalwaysbeenakeyinterestinthedemandingperformanceofthisproduct. contactwiththesechemicals,continuousexposureisnotrecommended.
a4+44(0)1159757600
www.fmsudafix.com 79
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