EUROPEANSTANDARDNORMEEUROPEENNEEUROP?ISCHENORM

EN17333-2

March2020

ICS83.180

EnglishVersion

Characterisationofonecomponentfoam-Part2:

Expansioncharacteristics

Caractérisationdesmoussesmonocomposants-PartieCharakterisierungvonEinkomponentensch?umen-

2:Caractéristiquesd'expansionTeil2:Ausdehnung

ThisEuropeanStandardwasapprovedbyCENon1December2019.

CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferences

concerningsuchnationalstandardsmaybeobtainedonapplicationtotheCEN-CENELECManagementCentreortoanyCENmember.

ThisEuropeanStandardexistsinthreefficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCEN-CENELECManagementCentrehasthesamestatusastheofficialversions.

CENmembersarethenationalstandardsbodiesofAustria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,

Poland,Portugal,RepublicofNorthMacedonia,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandUnitedKingdom.

EUROPEANCOMMITTEEFORSTANDARDIZATION

COMITEEUROPéENDENORMALISATION

EUROPAISCHESKOMITEEFüRNORMUNG

CEN-CENELECManagementCentre:RuedelaScience23,B-1040Brussels

◎2020CENAllrightsofexploitationinanyformandbyanymeansreservedRef.No.EN17333-2:2020EworldwideforCENnationalMembers.

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EN17333-2:2020(E)

ContentsPage

Europeanforeword 3

1Scope 4

2Normativereferences 4

3Termsanddefinitions 4

4Testmethods 5

4.1Method1-Dimensionalstability 5

4.1.1Principle 5

4.1.2Equipment 6

4.1.3Sampling 6

4.1.4Testprocedure 6

4.1.5Expressionofresults 10

4.1.6Testreport 11

4.2Method2-Curingpressure 12

4.2.1Principle 12

4.2.2Equipment 12

4.2.3Sampling 12

4.2.4Testprocedure 12

4.2.5Expressionofresults 15

4.2.6Testreport 15

4.3Method3-Postexpansion 16

4.3.1Principle 16

4.3.2Equipment 16

4.3.3Sampling 16

4.3.4Testprocedure 17

4.3.5Expressionofresults 19

4.3.6Testreport 20

AnnexA(informative)Exampleofthepresentationofthedimensionalstabilityresults 21

Bibliography ……………2

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EN17333-2:2020(E)

Europeanforeword

Thisdocument(EN17333-2:2020)hasbeenpreparedbyTechnicalCommitteeCEN/TC193"Adhesives",thesecretariatofwhichisheldbyUNE.

ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextorbyendorsement,atthelatestbySeptember2020,andconflictingnationalstandardsshallbewithdrawnatthelatestbySeptember2020.

Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.CENshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.

ThisdocumentisoneoftheproductEuropeanStandardswithintheframeworkseriesofEN17333onCharacterizationofonecomponentfoam,asfollows:

—Part1:Foamyieldcharacteristics;

-Part2:Expansioncharacteristics(thisdocument);

-Part3:Application;

-Part4:Mechanicalstrength;

—Part5:Insulation.

Thisdocumentisoneofaseriesofstandardswhichspecifytestmethodsfordeterminingthepropertiesofonecomponentfoams(OCFs).

AccordingtotheCEN-CENELECInternalRegulations,thenationalstandardsorganisationsofthefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,RepublicofNorthMacedonia,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandtheUnitedKingdom.

EN17333-2:2020(E)

4

1Scope

Thisdocumentspecifiestestmethodsfortheevaluationoftheexpansionpropertiesformoisturecuring,self-curingactivatableorwaterdryingfoamsdispensedfromsinglepressurizedfoamcontainers.

Thisdocumentdoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisdocumenttoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatoryrequirementspriortouse.

Thefollowingtestmethodsaredescribed:

-Method1-Dimensionalstability:Thistestmethoddescribeshowtodeterminethedimensionalstability(shrinkageorexpansion)ofcuredfoamundertypicalandextremeconditions.

-Method2-Curingpressure:ThismethoddescribeshowtodeterminethegenerationofpressureduringthecuringprocessofanOCF.

-Method3-Postexpansion:Thismethoddescribeshowtomeasuretheexpansionofadispensedfrothduringthecuringphase.

2Normativereferences

Thefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.

EN312,Particleboards-SpecificationsEN923,Adhesives-Termsanddefinitions

EN15006,Metalaerosolcontainers-Aluminiumcontainers-Dimensionsofthe25,4mmapertureEN14847,Aerosolcontainers-Tinplatecontainers-Dimensionsofthe25,4mmaperture

3Termsanddefinitions

Forthepurposesofthisdocument,thetermsanddefinitionsgiveninEN923andthefollowingapply.

ISOandIECmaintainterminologicaldatabasesforuseinstandardizationatthefollowingaddresses:

—ISOOnlinebrowsingplatform:availableat

/obp/ui

—IECElectropedia:availableat

/

3.1

onecomponentfoam

(OCF)

moisturecuringorwaterdryingfoamaswellasself-curingactivatablefoamdispensedfromasinglepressurisedfoamcontainer

3.2

pressurisedfoamcontainer

pressurisedcanaccordingtoEN14847andEN15006

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3.3

testcontainer

pressurisedcanaccordingtoEN14847andEN15006usedfortestingpurposes

3.4

dimensionalstability

abilityofcuredfoamtoretainitsdimensions

3.5

jigdwelltime

fixationperiod

timeperiodbetweenfoamingandremovingclamps

3.6

fullycuredordriedfoam

cross-linkedfoamwhichreachesitsserviceablepropertiesasclaimedbythemanufacturer

3.7

froth

uncured,freshlydispendedfoam

3.8

curingpressure

pressurebuild-upwithinthedispensedfrothduringcuringphase

3.9

postexpansion

increaseofthedispensedfrothvolumeduringthecuringphase

3.10

strawfoam

onecomponentortwocomponentfoamfortheextrusionwithanadaptertube

3.11

gunfoam

onecomponentfoamfortheextrusionwithafoamapplicationgun

4Testmethods

4.1Method1-Dimensionalstability

4.1.1Principle

Thefoamisdispensedinthegapbetweentwoparticleboards.Whenfoamisfullycured,thedimensionalstabilityofthefoamisdeterminedbymeasurementofthedistancebetweenthepanelsoverseveraldaysandweeks.

NOTETypicallyOCFstendtoshrinkwithinthefirstfewdaysaftercuringduetogasreleasefromtheclosedcells.Thevanishingpropellantleavesanunder-pressureinthecellsresultinginashrinkingofcellsize,thereforethewholefoamshrinks.Thiseffectisusuallycompensatedoverseveraldaysbytheslowerpermeationofair.

Shrinkingfoamcanaffectthesealingofjointsbyseparationfromthesurfacesordeformationofthejoints.ThedegreeofshrinkagedependsnotonlyontheOCFformulation,butalsoontheenvironmentalconditionse.g.humidityand/ortemperature.

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EN17333-2:2020(E)

4.1.2Equipment

Foreachmeasurement:

TwoP3orP5particleboards(compliantwithEN312)withdimensionsof200mm×100mm×10mm(length×width×thickness).

2spacers,notwaterabsorbing,notadherent[e.g.polyethylene(PE),polytetrafluoroethylene(PTFE),onwhichpolyurethane(PU)doesnotadhere),thickness20mm,length90mm.

2screwclamps.

Furthertools:

Sharpandcleanknifeblade.

Verniercaliper,withanaccuracyof0,1mm.

Conditioningchambercapableofbeingcontrolledattherequiredtemperatureandrelativehumidity(RH)giveninTable1andTable2.

Waterbath.

4.1.3Sampling

Conditioning

Bringthetestcontainertothetesttemperatureforatleast24h.

Theparticleboardsshallbestoredattestconditions[(23±2)℃and(50±5)%RH]foratleast1week.

Testpieces

Onesetupconsistsoftwoplatesandtwospacers(seeFigure2).Marksareputontheparticleboards(seeFigure1).Atthesemarksthewidthwillbemeasured(fourreadingpointsperjoint).

4.1.4Testprocedure

General

Itisnecessarytocarryoutatleastthreemeasurementstoobtainastatisticallyrelevantmeanvalue.

Whenpre-moisteningisrequired,theparticleboardsarewettedabundantly(see

).

Self-curingactivatablefoamsdon'trequiremoistenedsubstrates(see

).

Assembling

Theparticleboardpiecesandspacersareputtogetherasfollows:

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EN17333-2:2020(E)

Key

1particleboard

2measuringpoint

Figure1-Markingofmeasurementpoints

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Key

1spacer

2screwclamp

3particleboard

Figure2-Assemblyoftestplates

Thespacersareplacedatleast5mmfromthesideoftheparticleboardstobeabletoputtheVerniercaliperbetweentheparticleboards.Theclampsareusedtofixthejoints(positionedateachcornerorinlineofthespacers).

Fastentheclampswithmoderateforcetoavoiddeformationoftheparticleboards.

Ifpre-moistened,theclampedparticleboardsareimmersedinwaterfor20s,takenoutandstoredhorizontallyfortwominutes,untilexcesswaterdripsoff(seeFigure3).Thefoamingshallbestartedwithinthenext30s.

Dryandpre-wettedjointsshallnotbeputtogetherinoneandthesamestack.

EN17333-2:2020(E)

9

Figure3-Waterdripoff

Key

1PUfoam

2measuringpoint

3particleboard

Figure4-Readytestpiece

Foaming

a)Shakeanunusedtestcontainervigorously20times.Discardthefirst(40±10)goffoam.

b)Thejointsarestandinginuprightpositionandarefilledwithoutvoidsfrombothsides.Avoidoverexpansionofcuredfoamandfillaccordingtothemanufacturer'sinstructions(typical:gunfoam(80±10)%,strawfoam(60±10)%ofjointwidth).

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EN17333-2:2020(E)

c)Thestacksarekeptupright(seeFigure4)atnormalcondition[(23±2)℃and(50±5)%RH]duringthecuringperiod.

Measurement

Thestandardfixationperiod(timebetweenfoamingandremovingclamps)formoisturecuringfoamis24h.Forotherfoamsthejigdwelltimeisasrecommendedbythemanufacturers.Incasenofixationtimeisindicated,astandardperiodof24hshallbeused.

Afterthefixationperiodtheexcessfoamiscutaway.Beforethefixationisremovedfromthestack,thewidthofeachjointismeasuredbetweentheparticleboards(inside)atthefourcorners,usingtheVerniercaliper.TheinitialvalueservesasaveragedreferencevalueAoforthefuturemeasurements.InanidealmannerAoisidenticaltothewidthofthespacersandtheirdimensioncanbetakenoverwithoutfurthermeasurement.

Theclampsandspacersareremovedandthesamplesareputintotherequiredclimateforfurtherstorage(seeFigure4).Furthermeasurementsaretakenafter1day,2days,3days,7daysand14days.Ifthevaluesmeasuredafter14daysstillpointtosignificantchangesindimensions,furthermeasurementsafter3weeksand/or4weeksmaybenecessary.Usuallytherelevantvaluesarereceivedwithinthefirstfewdays.

NOTEBeforethemeasurementsaretaken,thestacksareremovedfromtheclimatechamberand

acclimatisedfortwohoursatnormalclimate(ifstoredatdifferentconditions).

Storageconditions

Thetestpiecesarestoreduprightallthetime.

Storageconditionsshallreflectactualenduseconditions.TheconditionsinTable1andTable2belowareprovidedonlyasaguidelineforextremeresults(shrinkage/expansion):

Table1-Storageconditionsformoisturecuringfoam

Pre-moistening

Fixationtime

Storageconditions

yes

24h

(23±2)℃and(50±5)%RH

(5±2)℃or(-10±2)℃

no

(40±2)℃and(90±5)%RH

(30±2)℃and(80±5)%RH

Table2—Storageconditionsforotherfoams

Pre-moistening

Fixationtime

Storageconditions

no

24hormanufacturer'srecommendations

(23±2)℃and(50±5)%RH

(10±2)℃

(40±2)℃and(90±5)%RH

(30±2)℃and(80±5)%RH

4.1.5Expressionofresults

Aftereachmeasurementattimenthemeanvaluesarecalculated(An)andthedimensionalstabilityisdeterminedinreferencetoAoasfollows:

(1)

EN17333-2:2020(E)

11

where

DSnisthedimensionalstabilityattimen;

A?istheinitialvalue(withclampsstillonthestack);

Anisthevalueofthemeasurementattimen.

FromallDS-valuesperjoint,theaverageminimumandmaximumvalueperconditionistakenforreporting.SeeanexampleinAnnexA(TableA.1andFigureA.1).Pleasenote,thatastatisticalrelevantnumberofmeasurements,atleastof3joints,shallbeavailabletogetinformativeresults.

NOTEAnexampleofthepresentationofthedimensionalstabilityresultscanbefoundinTableA.1andFigureA.1.

4.1.6Testreport

Thetestreportshallincludethefollowinginformation:

a)referencetothisdocument;

b)thenameandaddressofthetestinglaboratory;

c)thenumberanddateofthetestreport;

d)thenameandsignatureofthepersonresponsibleorsignatoryofthereport;

e)productidentification:

1)productname,manufacturerorsupplier,

2)batchnumberoridentificationcode,

3)originofthesample(s),

4)wayofdispensing,e.g.dispensinggunandtypeoradaptertube,

5)packaging:volume,

6)expirydateand/orproductiondate;

f)testprocedurefortestperformedaccordingto4.1:

1)dateoftest,

2)performer,

3)testconditions,

4)anydeviationfromprocedurein4.1;

g)resultsoftest:

1)testresults(e.g.individual,meanvaluesandchartofresults),

2)observations(ifany).

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EN17333-2:2020(E)

4.2Method2-Curingpressure

4.2.1Principle

Thefrothisdispensedintothegapbetweentwoparallelplates,whichareconnectedtoapressuremeasuringdevice.Thepressurebuildupismeasuredduringthewholecuringprocessuntilthemaximumlevelisreached.

NOTEThehardeningofpolyurethanebasedfoamsleadstovolumetricgrowthandpressurebuild-upofthedispensedfroth.Thispressureisintendedtoensureadhesiontothesubstrates;however,cancausejointdeformation.Thepressurecanbeabsorbedbythetemporaryinstallationofclampsorspacers.Incaseswherethisisnotpossibleusingalowcuringpressurefoammaybehelpful.

4.2.2Equipment

P3orP5particleboards(compliantwithEN312)withdimensionsof200mm×100mm×10mm(length×width×thickness)withsidessealedwithanimperviouswaterproofcoatingorsealantmaterial(e.g.epoxideorpolyesterbasedproductorsiliconesealant).

Spacers,notwaterabsorbing,notadherent,(e.g.polyethylene(PE),polytetrafluoroethylene(PTFE),..onwhichpolyurethane(PU)doesnotadhere),thickness20mm.

Conditioningchambercapableofbeingcontrolledat(23±2)℃and(50±5)%RH.

Tensiletestingmachine,withacapacityupto2kNfittedwithsuitablemetallicpressuresensorplatestomeasuretheforceexertedbythefoamduringthetest(seeFigure5).

4.2.3Sampling

Conditioning

Testconditions:(23±2)℃and(50±5)%RH.Anydeviationfromtheseconditionsshallbenotedinthetestreport.

Bringthetestcontainertothetesttemperatureforatleast24h.

Testpiecespreparation

Horizontaljointbuildwiththepanelsandthespacers(seeFigure5).

4.2.4Testprocedure

Assembling

a)Formoistening,theparticleboardplatesareimmersedinwaterfor20s,takenoutandstoredverticallyfor2minonawaterabsorbingtissue.

b)Buildahorizontaljointandputitbetweenthetestingmachineplates.Thespacersshallnotmoveduringtheprocessandshallbefixed(seeFigure5).

c)Adjustthepositionofthepressuresensorsplatessothattheytouchtheparticleboardplatesandapplyforceof10Nandzerothetensiletestingmachine.

EN17333-2:2020(E)

13

Key

1particleboard

2spacer

3pressuresensorplate

Figure5-Setupforthemeasurement

Foaming

a)Shakeanunusedtestcontainervigorously20times.

b)Discardthefirst(40±10)goffoam.

c)Fillthejointwithfoamsothatthefoamwillnotexpandmorethan20mmoutofthejoint(seeFigures6and7).

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EN17333-2:2020(E)

Key

1spacer

2particleboard

3pressuresensorplate

4PUfoamcontainer

Figure6—Fillingofthejoint

Key

1spacer

2particleboard

3pressuresensorplate

4PUfoam

Figure7-Runningmeasurement

EN17333-2:2020(E)

15

Measurement

a)Measurethecuringpressureofthefoamat(23±2)℃and(50±5)%RH.Startthemeasuringprogramimmediatelyafterthejointfilling.

b)Registerthemaximumforceandthetimerequiredtoattainthemaximumforce.

c)Themeasurementcanbestoppedwhenthepressurestartstodecrease.

d)Repeatthetestfor3timestogetthemeanvalue.

4.2.5Expressionofresults

Theindividualcuringpressureshallbedeterminedusingthefollowingformula:

(2)

where

Pisthemaximumpressure(Pa);

Fisthemaximumforce(N);

Aistheareafilledwithfoam(m2).

Thecuringpressureshallbedeterminedasthemeanofthe3individualvalues.

4.2.6Testreport

Thetestreportshallincludethefollowinginformation:

a)referencetothisdocument;

b)thenameandaddressofthetestinglaboratory;

c)thenumberanddateofthetestreport;

d)thenameandsignatureofthepersonresponsibleorsignatoryofthereport;

e)productidentification:

1)productname,manufacturerorsupplier,

2)batchnumberoridentificationcode,

3)originofthesample(s),

4)wayofdispensing,e.g.dispensinggunandtypeoradaptertube,

5)packaging:volume,

6)expirydateand/orproductiondate;

EN17333-2:2020(E)

16

f)testprocedurefortestperformedaccordingto4.2:

1)dateoftest,

2)performer,

3)testconditions,

4)anydeviationfromprocedurein4.2;

g)resultsoftest:

1)testresults(e.g.individual,meanvalues,timetomaximumforceandchartofresults),

2)observations(ifany).

4.3Method3-Postexpansion

4.3.1Principle

Thefoamisdispensedintoalinearjointuptoadefinedlevel.Thefoamexpandsduringthecuringphasetoitsfinalvolume.Thepostexpansionisthevolumeincreaseexpressedasapercentageofthedispensedfroth.

NOTETheevaporationofpropellantsand,incaseofpolyurethanes,thegenerationofCOz,expandsthedispensedfrothtoalargervolume.Thisexpansioncancausewasteoffoamandotherunwantedeffects,whicharehardtoanticipate.Bycalculatingthepostexpansionfactor,theconsumercanestimatethenecessaryfllingdegreeofthedispensedfrothtoavoidoverexpansion.

4.3.2Equipment

2moulds(ormoredependingonthefoam-see

f)madeofnon-porousdimensionallystablematerial;dimensions1000mm×35mm×35mm(length,height,width).Themouldsshallnotbedeformedbythefoamduringthecuringperiod(recommendedthickness20mmifnofurtherfixationapplied).

Sharpandcleanknifeblade.

Verniercaliper,accuracy<1mm.

Conditioningchambercapableofbeingcontrolledat(23±2)℃and(50±5)%RH.

Adhesivetape.

Absorbentpaper,length>1000mm.

4.3.3Sampling

Conditioning

Testconditions:(23±2)℃and(50±5)%RH(norm.climate).Anydeviationfromtheseconditionsshallbenotedinthetestreport.

Bringthetestcontainertothetesttemperatureforatleast24h.

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EN17333-2:2020(E)

Testpiecespreparation

Atleasttwomouldswhereeachconsistsoftwoplatesandtwospacerswithawidthof35mm(seeFigure8).

4.3.4Testprocedure

Assembling

a)Preparetwomouldswhereeachconsistsoftwoplatesandtwospacerswithawidthof35mm.

b)Placethefirstmouldontothepaper.

Key

1mould

Figure8-Lowermouldbeforeapplication

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EN17333-2:2020(E)

Key

1moulds

2PUfoam

Figure9-Setupwithfoamafterapplication

Foaming

a)Shakeanunusedtestcontainervigorously20times.

b)Discardthefirst(40±10)goffoam.

c)Applythefoamuptothetopedgeofthemould(ho=(35±3)mm).

d)Dispensingthefoamshalltakeapproximately(2±5)swithaconstantspeed.

e)Placedthesecond(empty)mouldontopofthefilledmouldfixedwithadhesivetape(seeFigure9).

f)Inthecaseofhighlyexpandingfoams,moremouldsmaybenecessaryinordertoavoidexpansionoverthetopofthemould.

g)Letthefoamcurefor24h.

Measurement

a)Removetheuppermould.

b)Measuretheheight(h?)ofcuredfoaminsevenpointsbytheuseofaVerniercaliper.Themeasuringpointsshallbealwaysinthesamepositione.g.every100mm(seeFigure10andFigure11).

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EN17333-2:2020(E)

Themouldshallnotbendmorethan1mmduringthemeasurement.

Key

1moulds

2PUfoam

Figure10-Foamreadytobemeasured

Key

1moulds

2PUfoam

Figure11-Foamreadyformeasurement

4.3.5Expressionofresults

The