UL746S

STANDARDFORSAFETY

EvaluationofSustainablePolymericMaterialsforUseinElectricalEquipment

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ULStandardforSafetyforEvaluationofSustainablePolymericMaterialsforUseinElectricalEquipment,UL746S

FirstEdition,DatedAugust30,2023

SummaryofTopics

ThisrevisionofANSI/UL746SdatedFebruary5,2025,includesthefollowingchangesinrequirements:

–AdditionofNewDefinitionstoGlossary,Section4(

4.1A

,

4.4A

–

4.8

);Revisionof

6.1.1

;Revisionof

Figure6.1

;Additionof

Figure6.2

TextthathasbeenchangedinanymannerorimpactedbyULSE'selectronicpublishingsystemismarkedwithaverticallineinthemargin.

ThenewandrevisedrequirementsaresubstantiallyinaccordancewithProposal(s)onthissubjectdatedNovember22,2024.

Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformbyanymeans,electronic,mechanicalphotocopying,recording,orotherwisewithoutpriorpermissionofULSEInc.(ULSE).

ULSEprovidesthisStandard"asis"withoutwarrantyofanykind,eitherexpressedorimplied,includingbutnotlimitedto,theimpliedwarrantiesofmerchantabilityorfitnessforanypurpose.

InnoeventwillULSEbeliableforanyspecial,incidental,consequential,indirectorsimilardamages,includinglossofprofits,lostsavings,lossofdata,oranyotherdamagesarisingoutoftheuseofortheinabilitytousethisStandard,evenifULSEoranauthorizedULSErepresentativehasbeenadvisedofthepossibilityofsuchdamage.InnoeventshallULSE'sliabilityforanydamageeverexceedthepricepaidforthisStandard,regardlessoftheformoftheclaim.

UsersoftheelectronicversionsofUL'sStandardsforSafetyagreetodefend,indemnify,andholdULSEharmlessfromandagainstanyloss,expense,liability,damage,claim,orjudgment(includingreasonableattorney'sfees)resultingfromanyerrorordeviationintroducedwhilepurchaserisstoringanelectronicStandardonthepurchaser'scomputersystem.

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AUGUST30,2023

(TitlePageReprinted:February5,2025)

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UL746S

StandardforEvaluationofSustainablePolymericMaterialsforUseinElectricalEquipment

FirstEditionAugust30,2023

ThisANSI/ULStandardforSafetyconsistsoftheFirstEditionincludingrevisionsthroughFebruary5,2025.

ThemostrecentdesignationofANSI/UL746SasanAmericanNationalStandard(ANSI)occurredonFebruary5,2025.ANSIapprovalforastandarddoesnotincludetheCoverPage,TransmittalPages,andTitlePage.

CommentsorproposalsforrevisionsonanypartoftheStandardmaybesubmittedtoULSEatanytime.ProposalsshouldbesubmittedviaaProposalRequestintheCollaborativeStandardsDevelopmentSystem(CSDS)at

.

OurStandardsforSafetyarecopyrightedbyULSEInc.NeitheraprintednorelectroniccopyofaStandardshouldbealteredinanyway.AllofourStandardsandallcopyrights,ownerships,andrightsregardingthoseStandardsshallremainthesoleandexclusivepropertyofULSEInc.

?2025ULSEInc.Allrightsreserved.

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CONTENTS

INTRODUCTION

Scope 5

UnitsofMeasurements 5

ReferencedPublications 5

Glossary 5

RelatedStandards 6

EVALUATIONOFMECHANICALLYRECYCLEDPLASTICS

MechanicallyRecycledPlastic 7

General 7

Mechanicallyrecycledplasticswithconsistentidentification 8

Mechanicallyrecycledplasticswithoutconsistentidentification 10

QualityAssurance(QA)program 11

MARKING

General 12

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INTRODUCTION

Scope

Thisstandardestablishesprogramrequirementsfortheevaluationofsustainablepolymericmaterialsforuseinelectricalequipment.Thetestprogramisintendedtoensureacceptablematerialperformancewithrespecttoflammability,electrical,mechanical,andotherrelatedsafetyproperties.

ThisStandardwillcovertherequirementsforusingMechanicallyRecycledPlasticinvariousproportionswiththevirginmaterial.

UnitsofMeasurements

Valuesstatedwithoutparenthesesaretherequirement.Valuesinparenthesesareexplanatoryorapproximateinformation.

ReferencedPublications

AnyundatedreferencetoacodeorstandardappearingintherequirementsofthisStandardshallbeinterpretedasreferringtothelatesteditionofthatcodeorstandard.

ThefollowingpublicationsarereferencedinthisStandard:

IEC60695-10-2,Firehazardtesting–Part10-2:Abnormalheat–BallpressuretestmethodUL94,StandardTestsforFlammabilityofPlasticMaterialsforPartsinDevicesandAppliancesUL746A,PolymericMaterials–ShortTermPropertyEvaluations

UL746B,PolymericMaterials–LongTermPropertyEvaluations

UL746C,PolymericMaterials–UseinElectricalEquipmentEvaluations

UL746D,PolymericMaterials–FabricatedParts

Glossary

ForthepurposesofthisStandardthefollowingdefinitionsapply.

ABATCH–Quantityormaterialregardedasasingleunitandhavingauniquereference.

MECHANICALLYRECYCLEDPLASTICBASECOLOR–Thecolorofthemechanicallyrecycledresinarisingfrompigmentsanddyesthatareintheasreceivedresinandpriortoanyfurtheradditionofpigmentsordyes.Forexample,thebasecolorofamechanicallyrecycledplasticsresincanbegrayorblackwiththeactualcolordependingonthedistributionofpigmentsanddyesgiventhemultipleplasticsbeingrecycledintherecycledplasticsstream.

MECHANICALLYRECYCLEDPLASTICS–Thoseplasticscomposedofpost-consumermaterialorpost-industrialmaterialonly,orboth,thatmayormaynothavebeensubjectedtoadditionalprocessingstepsofthetypesusedtomakeproductssuchasmechanicallyrecycled-regrind,orreprocessedplastic.

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POLYMERICMATERIAL–Acompoundformedbychemicalreactionthatresultsinlargemoleculeswhosemolecularweightisamultipleofthatoftheoriginalsubstance(monomer).Includesthermoplastic,thermoset,andelastomericmaterials.

4.4APOSTCONSUMERRECYCLE(PCR)MATERIAL–Materialgeneratedbyhouseholdsorbycommercial,industrialandinstitutionalfacilitiesintheirroleasend-usersoftheproductwhichcannolongerbeusedforitsintendedpurpose.Thisincludesreturnsofmaterialfromthedistributionchain.

4.4BPOSTINDUSTRIALRECYCLE(PIR)MATERIAL–Materialdivertedfromthewastestreamduringamanufacturingprocess.ExcludedfromthisdefinitionofPIRMaterialisthereutilizationofmaterialssuchasrework,regrindorscrapgeneratedinaprocessandcapableofbeingreclaimedwithinthesameprocessthatgeneratedit.

4.4CPRODUCTIONBATCH–Aquantityorconsignmentofrecycledplasticmaterial,producedatonetime,consistingofincomingrecycledstream(recoveredmaterial)fromasinglebatchormultiplebatches,optionallycombinedwithvirginresinand/orotheradditives.

DRECOVEREDMATERIALBATCH–Aspecificquantityorconsignmentofrecoveredmaterialthatisexpectedtobehomogeneouswithinspecifiedlimitsandhasauniquereferencenumber,usedasamaterialinput,inlieuofthevirginmaterial,forarecyclingormanufacturingprocess.

Deleted

Deleted

RECYCLEDSTREAM(RECOVEREDMATERIAL)–Materialthatwouldhaveotherwisebeendisposedofaswasteorusedforenergyrecovery,buthasinsteadbeencollectedandrecovered(reclaimed)asamaterialinput,insteadofnewprimarymaterial,forarecyclingormanufacturingprocess.

RELATEDVIRGINRESIN–Existingvirginmaterialfromwhichtherecyclematerialcompositionisderived.

RelatedStandards

ThefollowingisasummaryoftherequirementsprovidedinUL94,UL746A,UL746B,UL746C,andUL746D:

UL94coverflammabilityofpolymericmaterialsusedforpartsindevicesandappliances.

UL746Acontainsshort-termtestprocedurestobeusedfortheevaluationofmaterialsusedforpartsintendedforspecificapplicationsinelectricalendproducts.

UL746Bcontainslong-termtestprocedurestobeusedfortheevaluationofmaterialsusedforpartsintendedforspecificapplicationsinendproducts.

UL746Ccontaintestproceduresfortheevaluationofpolymericmaterialsinspecificapplicationsinendproducts.ThetestproceduresincludereferencetothedataobtainedfromthestandardpropertytestsinUL746A,aswellasotherpracticalmeansofevaluation.

UL746Dcoversrequirementsformaterialsthathavebeenmodifiedtomatchtherequirementsofaspecificapplication,includingtheuseofadditivesandcolorantsandtheblendingoftwoormorematerials.

RequirementsfortheevaluationofrecycledplasticmaterialsaredescribedinthisStandard.

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EVALUATIONOFMECHANICALLYRECYCLEDPLASTICS

MechanicallyRecycledPlastic

General

Mechanicallyrecycledplasticsshallbeevaluatedtodeterminewhetherthevariationsbetweenproductionbatcheshavesignificantlyaffectedcriticalmaterialproperties.

Figure6.1

illustratesthetestprogramforrecycledthermoplasticmaterialsandthefollowingparagraphsdescribethetestrequirementsandacceptabilitycriteria.

Figure6.2

providesadditionalinformationregardingproductionbatchespreparedbycombiningRecycledStream(RecoveredMaterial)withorwithoutvirginresin,fillersorotheradditives.

Figure6.1

MechanicallyRecycledThermoplasticMaterialTestProgram

MaterialisexpectedtomeetidentificationcriteriaperUL746A?

(a)

Yes

EstablishQAprogram

ThermoplasticMaterial

No

QAprogramexists?

Yes

RecycledProductionBatchwithConsistentIdentificationper

Materialmeetsminimumrequirementsofrecycledplastictestprogram

Evaluateoptionalpropertiesbytestingononeproductionbatch

UL746AandUL746CShort-TermPropertiesUL746BLong-TermProperties

EvaluateUL746AoptionalShort-TermPropertiesbytestingonthreeproductionbatches.

EvaluateUV/Waterexposureoptionalproperty(asperUL746C)ononeproductionbatch.

EvaluateUL746BoptionalLong-TermPropertiesbytestingononeproductionbatch.

Determineconsistencyofrecycledproductionbatch

EvaluatethreeproductionbatchesforFlame(b),IR,TGA,andDSC(a)

UL746A

Recycledplastic

meetscriteriaforconsistency?

(a)

Yes

No No

RecycledProductionBatchwithoutConsistentIdentificationperUL746A

QAprogramNoexists?

EstablishQAprogram

Yes

Determineconsistencyofrecycledproductionbatch

Evaluatefiveproductionbatchesfor

Flame(b)(c)

Tensilestrength

Impactstrength

Dielectricstrength

Hotwireignitionorglowwireignitiontemperature

HeatdeflectiontemporVicatTemp.(VT)orBallPressureTemp.(BP)(thermoplasticsonlyasperIEC60695-10-2

MethodB)

Recycledplastic

meetscriteriaforconsistency?

Yes

Confirmmaterial’sgenericidentitybytestingoneproductionbatchforIR

No

Materialdoesnotmeetminimumrequirementsofrecycledplastictestprogram

-MaterialidentificationcriteriaisspecifiedinAppendicesA,B,andCofUL746A.

-Ifthematerialusescolorpigmentsordyestochangetherecycledplasticbasecolor,arepresentativerangeofcolorsistobeevaluatedononeproductionbatch.

-FlameonlyinvestigationsofarecycledplasticwithoutconsistentidentificationtobeevaluatedalsoforMechanicalStrength,ImpactStrength,andDielectricStrengthonfiveproductionbatches.

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Figure6.2

ProductionBatchExamplesforMaterialsWithoutConsistentID’s

PostConsumerRecycleorPostIndustrialRecyclematerialwithoutconsistentID

SupplierA

Recoveredmaterialbatch1Recoveredmaterialbatch2Recoveredmaterialbatch3Recoveredmaterialbatch4

Recoveredmaterialbatch5

Productionbatch1Compoundingprocess Productionbatch2withorwithoutaddition Productionbatch3ofvirginresin,fillersor Productionbatch4

anyotheradditives Productionbatch5

5productionbatchtestingforRecyclematerialsW/oconsistentID

Recoveredmaterialbatch1Recoveredmaterialbatch2

Recoveredmaterialbatch3

Recoveredmaterialbatch4

Compoundingprocesswithorwithoutadditionofvirginresin,fillersoranyotheradditives

Productionbatch1

Productionbatch2

Productionbatch3

Productionbatch4

Productionbatch5

Recoveredmaterialbatch5

PostConsumerRecycleorPostIndustrialRecyclematerialwithoutconsistentID

SupplierA

PostConsumerRecycleorPostIndustrialRecyclematerialwithoutconsistentID

SupplierB

su5234

Mechanicallyrecycledplasticswithconsistentidentification

Mechanicallyrecycledplastics,asdescribedin

4.3

meetingtheidentificationcomparisoncriteriainUL746Aaretobecategorizedasrecycledplasticswithconsistentidentification.

Mechanicallyrecycledplastics,asdescribedin

4.3

thatareexpectedtomeettheidentificationcriteriainUL746AbetweendifferentbatchesaretohaveacompleteseriesofUL94flammabilityandUL746Aidentificationtests,conductedonspecimensforthreeproductionbatches.

Resultsoftestsforthethreeproductionbatchesareexpectedtomeetthefollowingrequirements:

TheidentificationtestsperUL746Aaretobecomparablebetweenbatches.

Thesameflammabilityratingistobemaintainedforalltestedproductionbatchesinthemechanicallyrecycledplasticbasecolororifbasecolorisnotpartoftheevaluation,acommonlyproducedcolorthatispartoftheevaluationcanbeconsideredforcompleteseriesofUL94flammabilityandUL746Aidentificationtests,onthreeproductionbatches.

Foradditionalcolors,onlyoneproductionbatchisrequiredforflammabilitytestingincompliancewithrequirementsfromtestspecimensforthe:

HorizontalBurningTest;

50W(20mm)VerticalBurningTest;V-0,V-1,orV-2;and

500W(125mm)VerticalBurningTest;5VAor5VB

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ofUL94,asapplicable,andtheratingofthisonebatchshallbethesameastheratingoftherecycledplasticcolorthatwasevaluatedforthreeproductionbatches.

Forevaluationofadditionalshortandlong-termproperties,testingofspecimensfromoneproductionbatchistobeconducted.

Shot-termpropertiesincludeignition(HWI,HAI,GWFI,GWIT),tracking(CTI,IPT,HVTR,D495),outdoorexposure(UV,Water),mechanical(Tensile,Impact),electrical(Dielectric),asreferencedinUL746A;and

Long-termpropertiesincludeTensileStrength,ElectricalStrength,orImpactStrengthevaluatedthroughheatagingperUL746B.

Agenericrelativethermalindex(RTI),perUL746B,shallbeassignedaccordingtothegenericidentityoftherecycledplasticascertainedthroughInfraredAnalysisperUL746A.

Table6.1

indicatesthecriteriaforassigningRelativeThermalIndex(RTI)toanexistingplasticmaterialwithelevatedRTIsforcasespertainingtoaddition,deletionandchange-in-levelofrecycledresinwithconsistentidentification.IftheidentificationtestresultsoftherecycledplasticsdonotcomparefavorablytoarelatedvirginresinwithanelevatedRTI,therecycledplasticshallobtainanelevatedRTIthrougha4-pointLongTermThermalAgingprogramdescribedinUL746B.Inthatcasetherecyclematerialevaluatedshallbeanewdesignation.

Table6.1

indicatesthecriteriaforassigningUV/waterresistanceratingtoanexistingplasticmaterialhavingUV/waterresistanceratingforcasespertainingtoaddition,deletionandchange-in-levelofrecycledresinwithconsistentidentification.UV/WaterresistancepropertiesdescribedinUL746Caretobeevaluatedononebatchforeachrepresentativecolor.IftheidentificationtestresultsoftherecycledplasticdonotcomparefavorablytoarelatedvirginresinwithUV/Waterresistancerating,therecycledmaterialevaluatedshallbeanewdesignation.

Table6.1

Long-TermPropertyEvaluationScenariosforMechanicallyRecycledPlastics

Component

Additiontovirginmaterial(virginresinisreplacedwithrecyclematerialofsamegeneric)

Deletion(recyclematerialisreplacedwithvirginmaterialofsamegeneric)

Changeinleveloftherecyclematerial(substitutewithvirginmaterialofsamegeneric)

Absolute(%)

Programcodea

Absolute(%)

Programcodea

Normalized(%)

Programcodea

Post-consumerand/orPost-industrialRecyclewithconsistentidentification

Any

1A,1E,1F

Any

1A

Decrease(Any)

1A

Increase(≤30)

1B

Increase(>30)

1E,1F

Post-consumerand/orPost-industrialRecyclewithoutconsistentidentification

Any

1D,1E,1F

Any

1C

Decrease(Any)

1C

Increase(≤30)

1D

Increase(>30)

1E,1F

aProgramCodes

Table6.1ContinuedonNextPage

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Table6.1Continued

Component

Additiontovirginmaterial(virginresinisreplacedwithrecyclematerialofsamegeneric)

Deletion(recyclematerialisreplacedwithvirginmaterialofsamegeneric)

Changeinleveloftherecyclematerial(substitutewithvirginmaterialofsamegeneric)

Absolute(%)

Programcodea

Absolute(%)

Programcodea

Normalized(%)

Programcodea

1A:FlammabilityandIdentificationtestson3productionbatchescomparesfavorablywithexistingrelatedmaterial.

1B:Flammability,TensileStrength(TS)orFlexuralStrength(FS),TensileImpact(TI)orIzodImpact(II)orCharpyImpact(CI)andIdentificationtestson3productionbatchescomparesfavorablywithexistingrelatedmaterial.

1C:Short-termproperties–TensileStrength(TS)orFlexuralStrength(FS),TensileImpact(TI)orIzodImpact(II)orCharpyImpact(CI),HeatDeflectionTemp.(HDT)orVicatTemp.(VT)orBallPressureTemp.(BP),DielectricStrength(DS),Flammability,HotWireIgnition(HWI)orGlow-WireIgnitionTemperature(GWIT)of3productionbatchescomparesfavorablywiththeexistingrelatedmaterial.

1D:Short-termproperties–TensileStrength(TS)orFlexuralStrength(FS),TensileImpact(TI)orIzodImpact(II)orCharpyImpact(CI),HeatDeflectionTemp.(HDT)orVicatTemp.(VT)orBallPressureTemp.(BP),DielectricStrength(DS),Flammability,HotWireIgnition(HWI)orGlow-WireIgnitionTemperature(GWIT)of5productionbatchescomparesfavorablywiththeexistingrelatedmaterial.

1E:TwotemperatureRTIprogramor2000hoursonetemperaturesinglepointRTIprogramasdescribedinThermoplasticsmaterialsofUL746B,ononeproductionbatchwithexistingrelatedresinascontrol.

1F:UV/WaterimmersiontestinrepresentativecolorsasdescribedinUltravioletLightExposureandWaterExposureandImmersionofUL746C,ononeproductionbatch.

Mechanicallyrecycledplasticswithoutconsistentidentification

Mechanicallyrecycledplastics,asdescribedin

4.3

notmeetingtherequirementsstatedin

6.2.1

aretobecategorizedasrecycledplasticswithoutconsistentidentification.

Mechanicallyrecycledplastics,asdescribedin

4.3

,withoutconsistentidentificationaretohaveacompleteseriesofflammability,ignition,tensilestrength,impactstrength,thermalsoftening,anddielectricstrengthtestsconductedonspecimensfromaminimumoffiveproductionbatches.

Resultsoftestsforthefiveproductionbatchesareexpectedtomeetthefollowingrequirements:

Thesameflammabilityratingshallbemaintainedforalltestedproductionbatchesinthemechanicallyrecycledplasticbasecolororifbasecolorisnotpartoftheevaluation,acommonlyproducedcolorthatispartoftheevaluationcanbeconsideredforcompleteseriesofUL94flammabilitytestsonfiveproductionbatches.

Foradditionalcolors,onlyoneproductionbatchisrequiredforflammabilitytestingincompliancewithrequirementsfromtestspecimensforthe:

HorizontalBurningTest;

50W(20mm)VerticalBurningTest;V-0,V-1,orV-2;and

500W(125mm)VerticalBurningTest;5VAor5VB

ofUL94,asapplicable,andtheratingofthisonebatchshallbethesameastheratingoftherecycledplasticcolorthatwasevaluatedforfiveproductionbatches;

Aminimumimpactstrengthvalue,asdefinedbythemanufacturerorapplicableend-productstandard,istobemetbyalltestedproductionbatches;

Thetensilestrengthvaluesaretobe±15percentfromthemeanofallthetestedproductionbatches;

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TheheatdeflectiontemperaturesorVicatTemperature(VT)orBallPressureTemp(BPT)(thermoplasticsonlyasperMethodB–Materialperformancetestmethod,ofIEC60695-10-2)aretobe±10percentthemeanofallthetestedproductionbatches;

Thedielectricstrengthvaluesaretomeetaminimumof5kV/mm(127kV/inch)foralltestedproductionbatches;and

Themanufacturercanchoosetotesteitherthehotwireignition(HWI)ortheglowwireignitiontemperature(GWIT)toevaluatetherecycledplastic’sresponsetoignitionasaresultoftheapplicationofahotwire.Thetestresultsforeithertestinthefiveproductionbatchesaretomeettheminimumvaluesasdefinedbythemanufacturerorbytheapplicableend-productstandard.

Mechanicallyrecycledplasticsasdescribedin

4.3

withoutconsistentidentificationaretobesubjectedtoInfraredAnalysis(IR)inaccordancewithUL746A,ononebatch,toconfirmthegenericmaterialclass,e.g.,polyethylene,polycarbonate,polypropylene,acrylonitrile-butadiene-styrene,etc.,inaccordancewithUL746B.

Eachadditionalshort-termmaterialpropertytobeevaluatedbeyondthepropertiesrequiredaboveshallrequiretestingofspecimensfromthreeproductionbatches.Theratingofanyadditionalpropertiestestedistobethelowestratingobtainedfromthetestingofthethreeproductionbatches.Shorttermpropertiesincludeignition(HWI,HAI,GWFI,GWIT),tracking(CTI,IPT,HVTR,D495),electrical(Dielectric),etc.,asreferencedinUL746A.

Table6.1

indicatesthecriteriaforassigningRelativeThermalIndex(RTI)toanexistingplasticmaterialwithelevatedRTIsforcasespertainingtoaddition,deletionandchange-in-levelofrecycledresinwithoutconsistentidentification.Ifthecompleteseriesoftestsoftherecycledplasticper