ASTM D 120-02a 橡胶绝缘手套

StandardSpecificationfor

RubberInsulatingGloves1ThisstandardisissuedunderthefixeddesignationD120;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.

1.Scope

1.1Thisspecificationcoversmanufacturingandtestingofrubberinsulatingglovesforprotectionofworkersfromelec-tricalshock.

1.2TwotypesofglovesareprovidedandaredesignatedasTypeI,non-resistanttoozone,andTypeII,resistanttoozone.1.3Sixclassesofgloves,differinginelectricalcharacteris-tics,areprovidedandaredesignatedasClass00,Class0,Class1,Class2,Class3,andClass4.

1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.SeeASTMSI10.

1.5Thefollowingsafetyhazardscaveatpertainsonlytothetestmethodportion,Sections16,17,18,and19,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificprecautionstatements,see18.2.

2.ReferencedDocuments2.1ASTMStandards:

D297TestMethodsforRubberProducts—ChemicalAnalysis2D412TestMethodsforVulcanizedRubberandThermo-plasticRubbersandThermoplasticElastomers—Tension2D518TestMethodforRubberDeterioration—SurfaceCracking2D573TestMethodforRubber—DeteriorationinanAirOven2D624TestMethodforTearStrengthofConventionalVulcanizedRubberandThermoplasticElastomers2D1149TestMethodforRubberDeterioration—SurfaceOzoneCrackinginaChamber2D1415TestMethodforRubberProperty—InternationalHardness2ThisspecificationisunderthejurisdictionofASTMCommitteeF18onElectricalProtectiveEquipmentforWorkersandisthedirectresponsibilityofSubcommitteeF18.15onWorkerPersonalEquipment.ThisstandardreplacesANSIStandardJ6.6,whichisnolongeravailable.

CurrenteditionapprovedOct.10,2002.PublishedDecember2002.OriginallypublishedasD120–21T.LastpreviouseditionD120–02.2AnnualBookofASTMStandards,Vol09.01.

1D2240TestMethodforRubberProperty—DurometerHardness2D2865PracticeforCalibrationofStandardsandEquip-mentforElectricalInsulatingMaterialsTesting3F819TerminologyRelatingtoElectricalProtectiveEquip-mentforWorkers4SI10StandardforUseoftheInternationalSystemofUnits(SI):TheModernMetricSystem53.Terminology3.1Definitions:

3.1.1colorsplash—asplash,smear,orstreakofcontrastingcolorevidentontheinsideoroutsidesurfaceoftheglovesthatwasdepositedduringthedippingoperationandisvulcanizedintothegloveaspartofthehomogenouscompound.

3.1.2glovecuffroll—therollorreinforcededgeofaninsulatinggloveatthecuff.

3.1.3halogenationtreatment—exposureoftheentireglovesurfaceareatoahalogenforthepurposeofreducingsurfacefriction.

3.1.4ozone—averyactiveformofoxygenthatmaybeproducedbycorona,arcing,orultravioletrays.

3.1.5user—theemployerorentitypurchasingtheequip-menttobeutilizedbyworkersfortheirprotection;intheabsenceofsuchanemployerorentity,theindividualpurchas-ingandutilizingtheprotectiveequipment.

3.1.6workingarea—allfingerandthumbcrotches,thepalm(areabetweenthewristandthebaseofthefingerandthumb)andtheareaofthefingerandthumbfacingthepalmnotextendingbeyondthecenterlineofthecrotch.SeeFig.1.3.1.7Fordefinitionsofotherterms,refertoTerminologyF819.

4.SignificanceandUse

4.1Thisspecificationcoverstheminimumelectrical,chemical,andphysicalpropertiesguaranteedbythemanufac-turerandthedetailedproceduresbywhichsuchpropertiesaretobedetermined.Thepurchaserhastheoptiontoperformorhaveperformedanyofthesetestsinordertoverifythe

34AnnualBookofASTMStandards,Vol10.02.AnnualBookofASTMStandards,Vol10.03.5AnnualBookofASTMStandards,Vol14.02.

Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.

1

FIG.1WorkingAreaofaRubberInsulatingGlove

TABLE1Proof-Test/UseVoltageRelationship

ClassofGlove

0001234

AMaximumAC

ACProof-TestDCProof-TestMaximumDCUse

UseVoltageAVoltage,rms,VVoltage,avg,VVoltageavg,V

acrms,V

2510203040

500000000000000000

17172636

500000500000500000

102040506070

000000000000000000

111253954

750500250500750000

ExceptforClass00and0gloves,theACRMSmaximumusevoltageisbasedonthefollowingformula:

MaximumACusevoltage(maximumnominaldesignvoltage)=0.95acproof-test

voltage−2000V

Thisformulatakesintoaccountthereductioninthevoltspermilcapabilityoftheglovewithincreasingthicknessoftherubber.

5.Classification

5.1Glovescoveredunderthisspecificationshallbedesig-natedasTypeIorTypeII;Class00,Class0,Class1,Class2,Class3,orClass4.

5.1.1TypeI,non-resistanttoozone,madefromahigh-gradecis-1,4-polyisoprenerubbercompoundofnaturalorsyntheticorigin,properlyvulcanized.

5.1.2TypeII,ozone-resistantmadeofanyelastomerorcombinationofelastomericcompounds.

5.1.3TheclassdesignationshallbebasedontheelectricalpropertiesasshowninTable2andTable3.

6.OrderingInformation

6.1Ordersforglovesunderthisspecificationshouldincludethefollowinginformation:6.1.1Type,6.1.2Class,

6.1.3Length,Fig.26.1.4Size,6.1.5Color,

6.1.6Cuffdesign,and

6.1.7Withorwithoutahalogenationtreatment.

6.2Thelistingoftypes,classes,lengths,sizes,colors,andcuffdesignsisnotintendedtomeanthatallshallnecessarilybeavailablefrommanufacturers;itsignifiesonlythat,ifmade,theyshallconformtothedetailsofthisspecification.7.ManufactureandMarking

7.1Theglovesshallbeproducedbyaseamlessprocess.7.2Theglovesshallhaveasmoothfinishandthecuffedgesshallbefinishedwitharollorareinforcingstripofrubber,unlessotherwisespecified.

7.3Eachgloveshallbemarkedclearlyandpermanently

guarantee.Claimsforfailuretomeetthespecificationaresubjecttoverificationbythemanufacturer.

4.2Glovesareusedforpersonalprotection;therefore,whenauthorizingtheiruse,amarginofsafetyshallbeallowedbetweenthemaximumvoltageonwhichtheyareusedandtheproof-testvoltageatwhichtheyaretested.Therelationshipbetweenproof-testvoltageandthemaximumvoltageatwhichtheglovesshallbeusedisshowninTable1.

4.3Workpracticesvaryfromusertouserandaredependentuponmanyfactors.Thesemayinclude,butarenotlimitedto,operatingsystemvoltages,constructiondesign,workproce-duretechniques,weatherconditions,andsoforth.Therefore,exceptfortherestrictionsetforthinthisspecificationbecauseofdesignlimitations,theuseandmaintenanceofthisequip-mentisbeyondthescopeofthisspecification.

4.4Itiscommonpracticeandtheresponsibilityoftheuserofthistypeofprotectiveequipmenttopreparecompleteinstructionsandregulationstogovernthecorrectandsafeuseofsuchequipment.

TABLE2ACVoltageRequirementProofTestCurrentsAClassofGlove

Proof-TestVoltage,rms,V

MinimumBreakdownVoltage,rms,V

MaximumProof-TestCurrent,mA

280-mm(11-in.)Glove

360-mm(14-in.)Glove

410-mm(16-in.)Glove

460-mm(18-in.)Glove

00250040000500060001100002000022000030000330000400004

40

000

50

000

AProoftestcurrentshallbemeasuredtoanaccuracyof61mA.BNotapplicable.

TABLE3DCVoltageRequirements

ClassofGlove

Proof-TestMinimumBreakdown

VoltageavgVVoltageavgV

001000013000020000350001400006000025000070000360000800004

70

000

90

000

withthenameofthemanufacturerorsupplier,ANSI/ASTMD120,type,class,andsize.Allsuchmarkingshallbeconfinedtothecuffportionofthegloveandshallbenonconductingandappliedinsuchamannerastonotimpairtherequiredpropertiesoftheglove.

7.3.1Eachgloveshallbemarkedwithalabelthatgivestheinformationspecifiedin7.3.Thislabelshallbethecolorspecifiedforeachvoltageclass:Class00—beige,Class0—red,Class1—white,Class2—yellow,Class3—green,andClass4—orange.

7.4Attherequestoftheuser,theglovesmaybegivenahalogenationtreatmenttoreducesurfacefriction.Thistreat-mentshallhavenodetrimentaleffectontheelectrical,chemi-cal,orphysicalpropertiesofthegloves.

8.DimensionsandPermissibleVariations

8.1Sampleglovesselectedinaccordancewith13.2shallfallwithinthethicknesslimitsspecifiedinTable4,whendeterminedinaccordancewith17.1.

8.2Sampleglovesselectedinaccordancewith13.2shallconformtostandardsizeswhendeterminedinaccordancewith17.2.Standardsizesare203mm(8in.),216mm(81⁄2in.),229mm(9in.),241mm(91⁄2in.),254mm(10in.),267mm(101⁄2in.),279mm(11in.),292mm(111⁄2in.),and305mm(12in.).Thepermissiblevariationinsizeshallbe613mm(61⁄2in.).8.3Sampleglovesselectedinaccordancewith13.2shallconformtostandardlengthswhenmeasuredinaccordancewith17.3.

8.3.1StandardlengthsforClass00glovesare280mm(11in.),and360mm(14in.).Thepermissiblevariationsshallbe613mm(61⁄2in.).

8.3.2StandardlengthsforClass0glovesare280mm(11in.),360mm(14in.),410mm(16in.),and460mm(18in.).Thepermissiblevariationsshallbe613mm(61⁄2in.).

8.3.3StandardlengthsforClass1,2,and3glovesare360mm(14in.),410mm(16in.),and460mm(18in.).Thepermissiblevariationshallbe613mm(61⁄2in.).

812BB8121416...141618...161820...182022...

...

2224

8.3.4StandardlengthsforClass4glovesare410mm(16in.)and460mm(18in.).Thepermissiblevariationshallbe613mm(61⁄2in.).

9.WorkmanshipandFinish

9.1Glovesshallbefreeonbothinnerandoutersurfaceofharmfulphysicalirregularitiesthatcanbedetectedbythoroughtestandinspection.

9.1.1Harmfulphysicalirregularitiesmaybedefinedasanyfeaturethatdisruptstheuniform,smoothsurfacecontourandrepresentsapotentialhazardtotheuser,suchaspinholes,cracks,blisters,cuts,conductiveembeddedforeignmatter,creases,pinchmarks,voids(entrappedair),prominentripples,andprominentmoldmarks.

9.2Nonharmfulphysicalirregularitiesmaybedefinedassurfaceirregularitiespresentontheinnerandoutersurfacesoftherubbergloveduetoimperfectionsonformsormoldsandinherentdifficultiesinthemanufacturingprocess.Theseirregu-laritiesmayappearasmoldmarksthatlooklikecutseventhoughtheyareactuallyaraisedridgeofrubber,indentations,protuberances,embeddedforeignmaterial,orcolorsplashesthatareacceptableprovidedthat:

9.2.1Theindentations,protuberanceormoldmarkstendtoblendintoasmoothslopeuponstretchingofthematerial.9.2.2Therubberthicknessatanyirregularityconformstothethicknessrequirements.

9.2.3Foreignmaterialremainsinplacewhenthegloveisfoldedandstretchedwiththematerialsurroundingit.

9.2.4Colorsplashesarenolargerthan1mminanydirectionontheinnersurfaceoftheworkarea.

9.2.4.1Theworkingareaisdefinedasallfingerandthumbcrotches,thepalm(areabetweenthewristandthebaseofthefingerandthumb)andtheareaofthefingerandthumbfacingthepalmnotextendingbeyondthecenterlineofthecrotch.SeeFig.1.

10.ChemicalandPhysicalRequirements

10.1Glovetestmaterialtakenfromsampleglovesselectedinaccordancewith13.3shallconformtophysicalrequirementsinTable5andtheacceleratedagingin19.2.6.

10.2Intheeventofadispute,theidentificationoftherubberpolymerinTypeIglovesshallbeperformedinaccordancewith19.1.

10.3TypeIIglovetestmaterialtakenfromsampleglovesselectedinaccordancewith13.3shallshownovisibleeffectsofozonewhentestedinaccordancewith18.6.Anyvisiblesignsofozonedeteriorationoftheglovematerial,suchas

FIG.2LengthandContourMeasurementsonContourCuffGloves

TABLE4ThicknessMeasurements

MinimumThickness

ClassofGlove0001234

InCrotchmm0.200.460.631.021.522.03

in.0.0080.0180.0250.0400.0600.080

OtherThanCrotchmm0.250.510.761.271.902.54

in.0.0100.0200.0300.0500.0750.100

MaximumThicknessmm0.751.021.522.292.923.56

in.0.0300.0400.0600.0900.1150.140

Table3whentestedinaccordancewithSection18.

11.2.1Glovesthathavebeensubjectedtoaminimumbreakdownvoltagetestshallnotbeusedforelectricprotection.Prooftestcurrentshallbemeasuredtoanaccuracyof61mA.11.3Sampleglovesselectedinaccordancewith13.2shallbesubjectedtoa60-Hzacmoistureabsorption/prooftestinaccordancewithSection18.

11.3.1The60-HzacprooftestcurrentshallnotexceedthevaluesspecifiedinTable2bymorethan2mA.

NOTE1—Iftheacprooftestismadeatanyfrequencyotherthan60Hz,thepermissibleproof-testcurrentshallbecomputedfromthedirectratioofthefrequencies.

NOTE2—Aproof-testcurrentisanindicationofthevalidityoftheglovemake-up,thedielectricconstantofthetypeofmaterialused,thethickness,andthetotalcontactareaundertest.

TABLE5PhysicalRequirements

Property

Tensilestrength,min,DieC,MPa(psi)Tensilestressat200%,max,MPa(psi)Ultimateelongation,min,%Tensionset,maxat400,%

Tearresistance,min,kN/m(lbf/in.)

Punctureresistance,min,kN/m(lbf/in.)Hardness,max,shoreA

TypeI17.2(2500)2.1(300)60025

21(120)18(100)47

TypeII10.3(1500)2.1(300)50025

14(80)18(100)47

12.Guarantee

12.1Themanufacturerorsuppliershallreplace,withoutchargetothepurchaser,unusedgloveswhich,atanytimewithinaperiodofnine(9)monthsfromdateofinitialdeliveryofshipmenttothepurchaserorhisdesignee,failtopassthetestsinthisspecification.Thisguaranteewillbebindingonthemanufacturerorsupplieronlyifthegloveshavebeenproperlystoredandhavenotbeensubjectedtomorethananoriginalacceptancetestandoneretest.

12.2Anyacceptancetestmadebythepurchaser,orthepurchaser’sdesignee,shallbeperformedwithinthefirsttwo(2)monthsoftheguaranteeperiodunlessotherwisespecified.

NOTE3—Properstoragemeansthatglovesarestoredrightsideout,notdistortedandnotstoreddirectlyaboveorinproximitytosteampipes,radiators,orothersourcesofartificialheat,orexposedtodirectsunlightorothersourcesofozone.Itisdesirablethattheambientstoragetemperatureshallnotexceed35°C(95°F).

checking,cracking,breaks,pitting,andsoforth,shallbeconsideredasevidenceoffailuretomeettherequirementsofTypeIIgloves.Incaseofdispute,MethodAoftheozoneresistancetestshallbetherefereetest.

11.ElectricalRequirements

11.1Eachgloveshallbegivenaprooftestandshallwithstandthe60-Hzacproof-testvoltage(rmsvalue)orthedcproof-testvoltage(averagevalue)specifiedinTable2orTable3.TheprooftestshallbeperformedinaccordancewithSection18.Thetestvoltageshallbeappliedcontinuouslyfor3min.11.1.1Whentheacprooftestisused,the60-Hzproof-testcurrentshallnotexceedthevaluesspecifiedinTable2atanytimeduringthetestperiod.(Note1andNote2).

11.2Sampleglovesselectedinaccordancewith13.2shallnotbreakdownatvoltagesbelowthosespecifiedinTable2or

13.Sampling

13.1Eachgloveinalotorshipmentshallbesubjectedto

inspectionandtesttomeettherequirementsofSections7,11.1,9,and15.

13.2Anoriginalsampleof1%ofthelotorshipmentornotlessthantwogloves,whicheverisgreater,shallbeselectedatrandomfromthelotorshipmentforthetestrequirementsof11.2,11.3andSection8.Whereafailureoccursinthefirstsample,asecondsampleofthesamequantityshallbeselectedandtested.

13.3Anoriginalsampleof0.1%ofthelotorshipmentornotlessthantwogloves,whicheverisgreater,shallbeselectedatrandomfromthelotorshipmentforthetestrequirementsofSections10.1and10.3.

14.Rejection

14.1IndividualglovesshallberejectediftheyfailtomeettherequirementsofSections7,9and11.1andtheminimumthicknessrequirementsof8.1.

14.2IndividualglovesmayberejectedattheoptionofthepurchaseriftheyfailtomeettherequirementsofSections8and15.

14.3Theentirelotorshipmentofglovesshallberejectedunderanyofthefollowingconditions:

14.3.1If5%ormore,butnotlessthantwogloves,inalotorshipmentfailtomeettherequirementsof11.1.

14.3.2Iftwoglovesinthefirstsamplefailtomeettherequirementsof11.2.

14.3.3Ifonegloveintheoriginalsampleandoneormoreglovesinthesecondsamplefailtomeettherequirementsof11.2.

14.3.4IfthesampleofTypeIIgloves,usingthesamplingmethodsof13.3,failstomeettherequirementsof10.3.

14.3.5Iftheprooftestcurrentontwoglovesinthefirstsampledonotmeettherequirementsof11.3.

14.3.6Iftheprooftestcurrentononegloveintheoriginalsampleandtheprooftestcurrentononeormoreglovesinthesecondsamplefailtomeettherequirementsof11.3.

14.4Thetestingshallbeterminatedandthemanufacturerorsuppliernotifiedif,duringthecourseoftesting,theglovesinalotorshipmentfailtomeettherequirementsof10.3,11.1,11.2,or11.3asdeterminedbytherejectioncriteriaof14.3.1,14.3.2,14.3.314.3.4,14.3.5,or14.3.6.ThemanufacturerorsuppliermayinsuchacaserequirethepurchasertosubmitproofthatthetestprocedureandequipmentconformtotheappropriateparagraphsofSection18.Whensuchproofhasbeenfurnished,themanufacturerorsuppliermayrequestthathisrepresentativewitnessthetestingofadditionalglovesfromtheshipment.

14.5Theentirelotorshipmentmayberejectedattheoptionofthepurchaseriftwospecimensofthefirstsampleandoneofthesecondsample,selectedinaccordancewith13.3,failanyoftheseparaterequirementsoutlinedinSection10.

14.6Theentirelotorshipmentofglovesmayberejectedattheoptionofthepurchaserif25%oftheglovesinthelotorshipmentfailtomeettherequirementsofSection8or9.14.7Allrejectedmaterialshallbereturnedasdirectedbythemanufacturer,athisorthesupplier’srequest,withoutbeingdefacedbyrubberstamporotherpermanentmarking.How-ever,thoseglovespuncturedwhentestedinaccordancewith11.1,11.2,and11.3shallbestamped,punched,orcutpriorto

beingreturnedtothesuppliertoindicatethattheyareunfitforelectricaluse.

15.PackagingandPackageMarking

15.1Eachpairofglovesshallbepackagedinanindividualcontainerofsufficientstrengthtoproperlyprotecttheglovesfromdamageintransit.Theendofthecontainershallbemarkedwiththenameofthemanufacturerorsupplier,type,class,length,size,color,andcuffdesign.

TESTMETHODS

16.SequenceofTesting

16.1Thefollowingorderofprocedureissuggestedfortestingrubberinsulatinggloves:

16.1.1InspectionofthesurfacesinaccordancewithSection9.

16.1.2ThedimensionsinaccordancewithSection17.16.1.3Electricalprooftestsinaccordancewith18.4.2or18.5.2.

16.1.4ACmoistureabsorption/prooftestinaccordancewith18.4.4.

16.1.5Breakdownvoltagetestsinaccordancewith18.4.3or18.5.3.

16.1.6Ozoneresistancetestsinaccordancewith18.6.16.1.7ChemicalandphysicalpropertytestsinaccordancewithSection19.

17.DimensionMeasurements17.1Thickness:

17.1.1Thicknessmeasurementsshallbemadeatfourormorepointsonthepalmside,fourormorepointsonthebackside,oneormorepointsinthecrotchofthethumbandindexfinger,andoneormorepointsinthecrotchesbetweenthefingers.SeeTable4.

17.1.2Thicknessmeasurementsshallbemadeoncompletegloveswithamicrometergraduatedtowithin0.025mm(0.001in.),havingananvilabout6mm(0.25in.)indiameterandapresserfootof3.1760.25mm(0.12560.010in.)indiameter.Thepresserfootshallexertatotalforceof0.8360.03N(3.060.1ozf).

NOTE4—Adial-typemicrometergraduatedinmillimetresorinchesandmountedinamannersimilartothatshowninFig.3andFig.4isparticularlyconvenientformakingthesemeasurements.

17.1.3Makesampletestspecimenthicknessmeasurementswithasimilarmicrometer,exceptthattheanvilshallbeatleast38mm(1.5in.)indiameteror,ifhavingasmalleranvil,beprovidedwithequivalentmeansofsupportingthespecimeninaflatposition.Inaddition,thepresserfootshallbe6.360.3mm(0.2560.010in.)indiameter.

17.2Sizeshallbetheinteriorcircumferenceoftheglovemeasuredonalineparalleltothefingercrotchesandpassingthroughthethumbcrotch.Themethodofdeterminingthisdimensionshallbetomeasuretheoutsidewidth,W,atthislinewiththehandofthegloveinaflattenedstate,subtracttwicethemedianglovethickness,T,inthehand,andmultiplythisdifferencebyafactorof2

S52~W22T!

where:

S=sizeoftheglove,W=outsidewidth,and

T=medianglovethickness.17.3Length:

17.3.1Lengthshallbemeasuredwiththegloveinarelaxedpositionandtheedgeofthecuffperpendiculartothelineofmeasurement.LengthisthedistancefromthetipofthesecondfingertotheoutsideedgeofthecuffasshowninFig.2andFig.5.

17.3.2Measurethedifferenceinlengthsforcontourcuffgloveswiththegloveinthesamepositionandalongalineparalleltothelengthdimensions,asshowninFig.2.18.ElectricalTests

18.1Allelectricaltestsshallbeperformedatroomtempera-ture.Thegloves,rightsideout,shallbefilledwithtapwaterandimmersedinwatertoadepthincompliancewithTable6forthetestvoltagetobeused.Thewaterlevelduringthetestshallbethesameinsideandoutsidetheglove.Thewaterinsidetheglovethatformsonetestelectrodeshallbeconnectedtooneterminalofthevoltagesourcebymeansofachainorslidingrodthatdipsintothewater.Thewaterinthetankoutsidetheglovethatformstheotherelectrodeshallbeconnecteddirectlytotheotherterminalofthevoltagesource.Thewatershallbefreeofairbubblesandairpocketsinsideoroutsidetheglove,andtheexposedportionofthegloveabovethewaterlineshallbedry.

NOTE5—Bothacanddcvoltageproof-testmethodsareincludedinthissection.Itisintendedthatonemethodbeselectedfortheelectricaltests.Themethodselectedshallbeattheoptionofthepurchaser,andthesuppliershouldbesonotifiedoftheselection.

18.2Caution:Itisrecommendedthatthetestapparatusbe

FIG.5LengthMeasurementonStandardCuffGlove

TABLE6Clearances—CufftoWaterLineA,BAC

ClassofGlove0001234

ABDC

Breakdown

ProofTest

in.11⁄211⁄221⁄23461⁄2mm38385176102153

in.11⁄211⁄22346

mm5151102127152178

Breakdown

in.224567

ProofTestmm3838386489127

in.11⁄211⁄211⁄221⁄231⁄25

mm38386476102165

Permissibletoleranceclearance—Cufftowater613mm(61⁄2in.).

Inthosecaseswhereatmosphericconditionsmakethespecifiedclearancesimpractical,theclearancesmaybeincreasedbyamaximumof25mm(1in.).

designedtoaffordtheoperatorfullprotectioninperformanceofhisduties.Reliablemeansofde-energizingandgroundingthehigh-voltagecircuitshallbeprovided.Itisparticularlyimportanttoincorporateapositivemeansofgroundingthehigh-voltagesectionofdctestapparatusduetothelikelypresenceofhigh-voltagecapacitancechargesattheconclusionofthetest.

18.3TestEquipment:

18.3.1Thetestequipmentusedintheproof,acceptance,anddielectricbreakdowntestsshallbecapableofsupplyinganessentiallysteplessandcontinuouslyvariablevoltagetothetestspecimen.Motor-drivenregulatingequipmentisconve-nientandtendstoprovideuniformrate-of-risetothetestvoltage.Thetestapparatusoreachposition,orboth,shouldbeprotectedbyanautomaticcircuit-breakingdevicedesignedtoopenpromptlyonthecurrentproducedbybreakdownofaspecimenundertest.Thiscircuitbreakingdeviceshouldbedesignedtoprotectthetestequipmentunderanyconditionsofshortcircuit.Theequipmentshallbeinspectedatleastannuallytoensurethatthegeneralconditionoftheequipmentisacceptableandtoverifythecharacteristicsandaccuracyofthetestvoltages.Calibratethetestequipmentatleastannually,inaccordancewithPracticeD2865.

18.3.1.1Toeliminatedamagingozoneandpossibleflash-overalongtheglovecuff,thereshouldbeasufficientflowofairintoandaroundthegloveandanexhaustsystemtoadequatelyremoveozonefromthetestmachine.Consistentozonecuttingandcheckingduringthetestprocedureshouldbecausetoascertaintheadequacyoftheexhaustsystem.

18.3.1.2Glovefailureindicatorsoraccessorycircuitsshallbedesignedtogivepositiveindicationoffailureandshallrequireresettingbytheoperatorbeforetestscanbecontinued.18.4ACTests:

18.4.1VoltageSupplyandRegulation:

18.4.1.1Thedesiredtestvoltagemaybeobtainedmostreadilyfromastep-uptransformerenergizedfromavariablelow-voltagesource.Thetransformeranditscontrolequipmentshallbeofsuchsizeanddesignthat,withthetestspecimeninthecircuit,thecrestfactor(ratioofmaximumtomeaneffective)ofthetestvoltageshalldifferbynotmorethan5%fromthatofasinusoidalwaveovertheupperhalfoftherangeofthetestvoltage.

18.4.1.2Thecorrectrmsvalueofthesinusoidalvoltagewave-formappliedtotheglovemaybemeasuredbyoneofthefollowingmethods:(1)avoltmeterusedinconjunctionwithacalibratedinstrumenttransformerconnecteddirectlyacrossthehigh-voltagecircuit,(2)acalibratedelectrostaticvoltmeterconnecteddirectlyacrossthehigh-voltagecircuit,(3)avolt-meterconnectedtoatertiarycoilinthetesttransformer,providedithasbeendemonstratedthattheassignedratiooftransformationdoesnotchangewithload,or(4)anacmeterconnectedinserieswithappropriatehigh-voltagetyperesistorsdirectlyacrossthehigh-voltagecircuit.Theaccuracyoftheadoptedvoltage-measuringcircuitshallbewithin62%offullscale.

NOTE6—Avoltmeterconnectedtothelow-voltagesideofthetestingtransformermaybeusedonlyiftheratiooftransformationhasbeenproperlydeterminedandisknownnottochangeappreciablywithload.Acalibratedspheregapmaybeusedtochecktheaccuracyofthevoltageasindicatedbythevoltmeter.

18.4.1.3Thecrestfactormaybecheckedbytheuseofapeak-readingvoltmeterconnecteddirectlyacrossthehigh-voltagecircuit;or,ifanelectrostaticvoltmeteroravoltmeterinconjunctionwithaninstrumentpotentialtransformeriscon-nectedacrossthehigh-voltagecircuit,astandardspheregapmaybesparkedoverandthecorrespondingvoltagecomparedwiththereadingofthermsvoltmeter.

18.4.1.4Theproof-testcurrentshallbemeasuredbyinsert-ingamilliammeterinserieswitheachindividualglove.Thereadingshouldbetakenneartheendoftheproof-testperiod.18.4.2ACProofTests:

18.4.2.1Eachgloveshallbegivenaprooftestinaccor-dancewiththerequirementsof11.1.Theproof-testvoltageshallbeappliedinitiallyatalowvalueandincreaseataconstantrate-of-riseofapproximately1000V/suntiltheprescribedtestvoltagelevelisreached,orfailureoccurs.Thetestperiodstartsattheinstantthattheprescribedtestingvoltageisreached.Theappliedvoltageshouldbereducedtoatleasthalfvalue,unlessanelectricalfailurehasoccurred,attheendofthetestperiodbeforeopeningthetestcircuit.18.4.3ACBreakdownTest:

18.4.3.1Eachsampleselectedinaccordancewith13.2shallbegivenabreakdowntestasspecifiedin11.2.Thevoltageshallbeappliedatalowvalueandincreaseataconstantrate-of-riseofapproximately1000V/suntiltheprescribedminimumbreakdownvoltageisreachedorfailureoccurs.Themaximumvoltageobservedpriortofailureshallbeconsideredasthebreakdownvoltage.

18.4.4ACMoistureAbsorption/ProofTest:

18.4.4.1Eachsampleselectedinaccordancewith13.2shallbegivenanACmoistureabsorption/prooftestasspecifiedin11.3.Sampleglovesthathavepassedtheacprooftestrequirementof18.4.2shallbeplacedinthetestequipment,immersedinwaterinaccordancewith18.1andsoakedfor16h.Alternately,theglovesmaybesoakedbysubmergingcompletelyinwaterwithouttrappingairandthentransferringthemdirectlytothetestequipmentinaccordancewith18.1.Thegloveswillbesoakedfor16continuoushoursatroomtemperature.Immediatelyafterthesoakperiod,theprooftestvoltageshallthenbeappliedinitiallyatalowvalueandincreasedataconstantrate-of-riseofapproximately1000V/suntiltheprescribedtestvoltagelevelisreachedorfailureoccurs.Theprooftestcurrentshallthenbemeasuredandrecorded.Theappliedvoltageshallthenbereducedtoatleasthalfvalue,unlessanelectricalfailurehasoccurred,beforeopeningthetestcircuit.

NOTE7—Ifanalternatemethodisused,ensurethattheclearanceareaisdrytoavoidflashover.

18.5DCTests:

18.5.1VoltageSupplyandRegulation:

18.5.1.1Thedctestvoltageshallbeobtainedfromadcsourcecapableofsupplyingtherequiredvoltage.Thepeaktopeakacripplecomponentofthedcproof-testvoltageshallnotexceed2%oftheaveragevoltagevalueunderno-loadconditions.

18.5.1.2Measurethedcproof-testvoltagebyamethodthatprovidestheaveragevalueofthevoltageappliedtotheglove.Itisrecommendedthatthevoltagebemeasuredbytheuseofadcmeterconnectedinserieswithappropriatehigh-voltagetyperesistorsacrossthehigh-voltagecircuit.Anelectrostaticvoltmeterofproperrangemaybeusedinplaceofthedcmeter-resistorcombination.Theaccuracyofthevoltage-measuringcircuitshallbewithin62%offullscale.18.5.2DCProofTest:

18.5.2.1Eachgloveshallbegivenaprooftestinaccor-

dancewiththerequirementsof11.1.Thedcproof-testvoltageshallbeappliedinthesamemannerasforacprooftestsexceptwitharate-of-riseofapproximately3000V/s.18.5.3DCBreakdownTest:

18.5.3.1Thedcbreakdowntestsshallbeperformedinthesamewayasacbreakdowntestsexceptwitharate-of-riseofapproximately3000V/s.

18.6OzoneResistanceTest—TheozoneresistancetestshallbemadeinaccordancewithoneofthefollowingmethodstoensureconformanceofTypeIIgloveswiththerequirementsof10.3.

18.6.1MethodA—TheozoneresistancetestshallbemadeinaccordancewithTestMethodD1149,usingProcedureAofTestMethodD518topreparethespecimen.Thespecimenshouldbecuttoa12by100-mm(0.5by4-in.)rectangularsize.FollowProcedureAusinga20%extension.Maintaintheozoneconcentrationat5065mPapartialpressure(5065pphmbyvolumeatstandardatmosphericpressure)fora3htestperiod.TypeIIglovesshallshownoeffectfromozoneexposureduringthistestperiod.18.6.2MethodB:

18.6.2.1Theozoneresistancetestshallbemadeona100by150-mm(4by6-in.)specimenoftheglovematerialpreparedfromasamplesuitablyconditionedbylyingflatfor24h.Thespecimenshouldbedrapedovera25-mm(1-in.)diametermetaltubeofsufficientlengthtocompletelyunderliethespecimen,whilepossessingadditionallengthfortherequiredmountingsupports.Themetaltubingshallbeelectricallygrounded.Thefreeendsofthespecimenshallbeclampedbeneaththetubingelectrodesothatanintimatecontactisestablishedbetweenthespecimenandthetubingalongtheupperhalfofthecylindrically-shapedelectrodesurface.

18.6.2.2Apieceofflataluminumsheetfoil,approximately50by100mm(2by4in.),shallbeplacedoverthedrapedspecimensoastoprovideadequateseparationdistancetopreventflashoverbetweenthefoilandthemetaltubing.Anelectrodewireshallbeconnectedtothealuminumfoil.

18.6.2.3Theouterelectrode(metalfoil)shallbeenergizedto15kVac(rms)fromastable60-Hzsource.The15kVpotentialmaybederivedfromasuitablyratedpotentialtransformerenergizedfromitslow-voltagewindingthroughacontinuouslyvariableautotransformer.Anovercurrentprotec-tivedeviceshouldbeincorporatedintothelow-voltagecontrolcircuitincaseofanelectricalbreakdown.

18.6.2.4Theozoneresistanceofthespecimenshouldbedeterminedqualitatively,byinspection,aftera1-hexposureperiodinthetestapparatusatthe15kVpotential.Atleasttwospecimensfromeachsamplegloveselectedinaccordancewith13.2shallbetested.Twospecimensshouldnotbetakenfromthesamesectionofthesampleglove.

NOTE8—TherateofozonedegradationbyuseofMethodBisinverselyproportionaltotherelativehumidityofthesurroundingair.Empiricaldataindicate,however,thatvisibleozoneeffectswillbeevidentoverabroadrangeofambienthumiditiesunderthesetestconditions.

19.ChemicalandPhysicalTests19.1ChemicalTests:

19.1.1ThecompositionoftherubberhydrocarbonportionofTypeIglovesmaybedeterminedinaccordancewiththetest

methodinMethodsD297.19.2PhysicalTests:

19.2.1PhysicaltestsshouldbeperformedtodeterminethephysicalrequirementsspecifiedinSection10.Theglovesamplesshouldbeconditionedbystoringinaflatpositionfor24hataroomtemperatureof2364°C(7367°F).

19.2.2Thetensilestrength,tensilestressat200%ofelongation,andtensionsettestsshallbeperformedinaccor-dancewithTestMethodsD412,exceptforelongationtime.ThetestspecimenshallconformindimensionstoDieC.Theelongationinthetensionsetshallbe400%withgripsepara-tionatarateof500650mm(2062in.)/min.

19.2.3Thetearresistancetestshallbeperformedinaccor-dancewithTestMethodD624.ThetestspecimenshallconformtothedimensionsofDieC.

19.2.4Thepunctureresistancetestshallbeperformedtodeterminetheabilityoftheglovematerialtowithstandpuncture.

19.2.4.1Aglovespecimenshallbecuttofitbetweentheopposingfacesoftwoflatmetalplateshavingconcentricopenings.Thethicknessofeachtestspecimenshallbemea-suredatitsapproximatecenterusingamicrometerhavingthecharacteristicsdescribedinTestMethodsD412.Oneoftheplatesshallhaveacircularopening6mm(0.25in.)indiametertoallowthepassageofastainlesssteelneedle.Theotherplateshallhaveanopening25mm(1.0in.)indiametertoprovideafixedfreeareathroughwhichthespecimencanelongate

whilebeingsubjectedtothepressureoftheneedlepoint.Theedgesoftheopeningsshouldberoundedtoaradiusofapproximately0.8mm(0.03in.).Theneedleshallbemadefrom5-mm(0.19-in.)diameterType304stainlesssteelrod.Therodshouldbemachinedatoneendtoproduceataperwithanincludedangleof12°withthetipofthetaperedendroundedtoaradiusof0.8mm(0.03in.).Theneedleshallbeinitiallypositionedperpendicularlytothespecimensothatthepointcontactsthespecimenthroughthesmallholeintheplate.Theneedleshallbedrivenintoandthroughthespecimenatacontinuousrateofapproximately8.3mm/s(20in./min).Themaximumforcerequiredtoperformthepuncturingoperationshallbemeasuredtothenearest2N(0.5lbf).Thepunctureresistanceshallbecalculatedbydividingthepuncturingforcebythespecimenthicknessandrecordedinunitsofnewtonspermetre(orpounds-forceperinch).

19.2.5ThedurometertestshallbeperformedinaccordancewithTestMethodD1415orTestMethodD2240,usingaTypeAdurometer.

19.2.6TheacceleratedagingtestsshallbeperformedinaccordancewithTestMethodD573.Afterbeingsubjectedtoatemperatureof7062°C(15863.6°F)incirculatingairfor7days,thetensilestrengthandelongationofthespecimenshallnotbelessthan80%oftheoriginal.

20.Keywords

20.1electricalinsulatinggloves;lineman;linemanprotec-tiveequipment

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