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Designation:D3363
−
05(Reapprove d2011)
´2
StandardTestMethodfor
FilmHardn essbyPencilTest
1
Thisstandardisissuedundert hefixeddesignationD3363;thenumberimmediatelyfollowi ngthedesignationindicatestheyearof
originaladop tionor,inthecaseofrevision,rinparenthesesindicates theyearoflastreapproval.A
superscriptepsilon(´) indicatesaneditorialchangesincethelastrevisionorre approval.
Thisstandardhasbeenapprovedforusebyag enciesoftheDepartmentofDefense.
´
1
NOTE— Figure1wascorrectededitoriallyinAugust2011.
´2
NOTE—Figure2andSection7werecorrectededitori allyinMarch2012.
*
1.1Thistestmethodcoversap rocedureforrapid,inexpen-
sivedeterminationofth efilmhardnessofanorganiccoating
onasubstrateinte rmsofdrawingleadsorpencilleadsof
knownhardness.
1.2Thistestmethodissimilarincontent(butnottech ni-
callyequivalent)toISO15184.
1.3Thevalues statedinSIunitsaretoberegardedasthe
uesgiveninp arenthesesareforinformation
only.
1.4Thissta ndarddoesnotpurporttoaddressallofthe
safetyconc erns,ifany,e
responsibilityoftheuserofthisstand ardtoestablishappro-
priatesafetyandhealthpract icesanddeterminetheapplica-
bilityofregulatoryl imitationspriortouse.
ncedDocuments
2.1Other Standards:
ISO15184Determinationoffilmhardnessby penciltest.
2
yofTestMethod
3.1Acoatedpan elisplacedonafirmhorizontalsurface.
Thepencilish eldfirmlyagainstthefilmata45°angle(point
awayfrom theoperator)andpushedawayfromtheoperatorin
a6.5 -mm(
1
⁄
4
-in.)cessisstartedwiththeha rdest
pencilandcontinueddownthescaleofhardnesst oeitherof
twoendpoints:one,thepencilthatwillnot cutintoorgouge
thefilm(pencilhardness),ortwo,the pencilthatwillnot
scratchthefilm(scratchhardness ).
ficanceandUse
4.1Pencilhardnessmeasurement shavebeenusedbythe
coatingsindustryformanyyears todeterminethehardnessof
clearandpigmentedorgan iccoatingfistmethod
hasalsobeenusedtodetermineth ecureofthesecoatings,
especiallywhenforceddried usingheat.
4.2Thistestmethodisespeciallyusefuli ndevelopmental

shouldberecognizedthattheres ultsobtainedmayvary
betweendifferentlaboratorie swhendifferentpencilsaswellas
ffortshouldbemade tostandardizethe
hardnessoftheleadusedandthetec hniquefollowed.
4.3Ifthistestmethodisusedasabas isforpurchase
agreement,maximumprecisionwillbea chievedifagivenset
ofrefereepencilsbeagreedupon betweenthepurchaserand
theseller.
tus
5.1 Asetofcalibrateddrawingleads(preferred)orequiva-lentcalibratedwoodpencilsmeetingthefollowingscal eof
hardness:
6B25B24B23B22B2B2HB2F2H22H23H2 4H25H26H
SofterHarder
(1)
Thedifferencebe tweentwoadjacentleadsshallbeconsid-
eredoneunit ofhardness.
5.2MechanicalLeadHolder,fordrawingl eadsifused.
5.3MechanicalSharpener,draftsman-ty pe,ishelpfulfor
trimmingwoodpencilsifused.
5 .4AbrasivePaper,gritNo.400.
ecimensandCondition s
ThistestmethodisunderthejurisdictionofASTMCom mitteeD01onPaint
andRelatedCoatings,Materials,a ndApplicationsandisthedirectresponsibilityof
Su bcommitteeD01.23onPhysicalPropertiesofAppliedPaint Films.
CurrenteditionapprovedJune1,ally
evio useditionapprovedin2005asD3363–:
10.1520D3363-0 5R11E02.
2
AvailablefromAmericanNationalStan dardsInstitute(ANSI),25W.43rdSt.,
4thFloor,NewY ork,NY10036,http:.
1
6.1Applythesurfacecoati ngbyappropriatemeanstoa
smoothrigidsubstrateand cureproperly,oruserepresentative
elsused,thecur ing
conditions,andtheageofthecoatingpriortothet estshallbe
withinthelimitsagreeduponbetweenthep urchaserandthe
seller.
*ASummaryofChangessec tionappearsattheendofthisstandard
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1
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D3363−05( 2011)
´2
6.2Thefilmthicknessofthecoatingshall beasspecifiedor
asagreeduponbetweenthepurchasera ndtheseller.
6.3Conductthetestat2362°C(73.563.5 °F)and506
5%relativehumidity.
ure
7.1Forw oodpencils,removeapproximately5to6mm(
3
⁄
16
to
1
⁄
4
in.)ofwoodfromthepoint ofeachpencilusinga
draftsman-typemechanicalshar pener,beingcarefultoleavean
undisturbed,unmarke d,gthe
pencilholder(whenusingdrawingleads)atana ngleof90°to
theabrasivepaper,rubtheleadagainstt hepapermaintaining
anexactangleof90°totheabrasi vepaperuntilaflat,smooth
andcircularcrosssection isobtained,freeofchipsornicksin
dpencils,see
Fig.1for
hanicalpencilholderswithdrawing
le ads,irededgemaybe
obtainedbycementingtheabrasiv epapertoaflatmotor-driven
ortingthepencilat90°to therotatingdiska
uniformflatleadendmaybeobtained morereproducibly.
7.2Placethecoatedpanelonaleve l,firm,horizontal
ngwiththehardestlead,holdthepe ncilorlead
holderfirmlywiththeleadagainstthefilma ta45°angle(point
awayfromtheoperator)andpushawa yfromtheoperator.
Exertsufficientuniformpressur edownwardandforwardeither
tocutorscratchthefi
issuggestedthatthelengthofthestrokebe6.5mm(
1< br>⁄
4
in.).
7.3Repeattheprocessdowntheha rdnessscaleuntila
pencilisfoundthatwillnotcutth roughthefilmtothesubstrate
(eithermetaloraprevio uscoat)foradistanceofatleast3mm
(
1
⁄
8
in.)(see8.1.1).
N
OTE
1—Theoperatorm ustwatchcloselyforcuttingintoorscratching
thefifi nishescontaincompoundsthatmaytendtolubricatethe
fishouldbemadebyclosevisualinspectionandbyfingernai l
feel.
N
OTE
2—Inconductingthetest,if thesharpedgeoftheleadisslightly
chippedorcrumbl ed,theleadmustberesharpened.
FIG.2ViewofMechani calHolderwithSharpenedDrawingLead

8.1Report thefollowinginformation:
8.1.1Thetwoendpointsas follows:
8.1.1.1GougeHardness—Thehardestpencilt hatwillleave
thefilmuncutforastrokelengthofatlea st3mm(
1
⁄
8
in.).
8.1.1.2ScratchHa rdness—Thehardestpencilthatwillnot
ruptureorscr atchthefilm.
8.1.2Themakeandgradeofleadorpencilu sed,and
8.1.3Anydeviationfromstandardconditions ,including
roughnessinthefinish.
ionandBias9.1Precision—Inaninterlaboratorytestofthistestme thod
withthreedifferentfilmsonpanels,tenlaborato riesand
operators,andrepeatedbyswitchingleadsan dpanelsbetween
laboratories,thewithin-laborator ystandarddeviationwas
foundtobe0.52andthebetwee n-laboratorystandarddeviation
nthesestandarddev iations,the
followingcriteriashouldbeusedforjud gingtheacceptability
ofresultsata95%confidencele vel:
9.1.1Repeatability—Tworesultsobtainedbytwo operators
withinalaboratoryusingthesamepencilsa ndpanelsshouldbe
consideredsuspectiftheydifferb ymorethanonepencilunit
onthescaledescribedin
5.1.
9.1.2Reproducibility—Tworesults,eachtheme anofat
leasttwodeterminations,obtainedbyoperato rsindifferent
laboratoriesusingthesamepencilsan dpanelsordifferent
pencilswiththesamepanelsshou ldbeconsideredsuspectif
theydifferbymorethanone pencilunitonthescaledescribed
in5.1.
9.1.3Bi as—Sincethereisnoacceptablematerialsuitable
for determiningthebiasfortheprocedureinthistestmethod< br>formeasuringpencilhardness,biascannotbedetermin ed.
ds
10.1hardness(scratch);pencilhardness< br>7.4Continuetheprocessuntilapencilisfoundthatwil l
neithercutthroughnorscratchthesurfaceofthefidefacementofthefilmotherthanacut(gouge)isconsider eda
eachendpoint(ifapplicable)forgougeand
sc ratchhardness(see
8.1).
N
OTE
3—Withso mefilms,thetwoendpointswillbeidentical.
7.5Makea minimumoftwodeterminationsforgouge
hardness(7.3 )andscratchhardness(7.4)foreachpencilor
lead.FIG.1ViewofWoodPencilafterSharpening
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D3363−05(2011)
´2
SUMMARYOFCHANGES
Comm itteeD01hasidentifiedthelocationofselectedchangesto thisstandardsincethelastissue
(D3363–00)thatmay impacttheuseofthisstandard.
(1)
Figs.1and2we readdedtomakeitclearertotheuserof
thisstandardh owthetrimmedwoodfromwoodpenciland
geometryofthe leadtipshouldappear.
ASTMInternationaltakesnopo sitionrespectingthevalidityofanypatentrightsassert edinconnectionwithanyitemmentioned
fthisstandar dareexpresslyadvisedthatdeterminationofthevalidity ofanysuchpatentrights,andtherisk
ofinfringement ofsuchrights,areentirelytheirownresponsibility.
Thisstandardissubjecttorevisionatanytimebytheresp onsibletechnicalcommitteeandmustbereviewedeveryfive yearsand
ifnotrevised,mmentsareinvitedeitherfor revisionofthisstandardorforadditionalstandards
mmentswillreceivecarefulconsiderationatameetingoft he
responsibletechnicalcommittee,eelthatyourcom mentshavenotreceivedafairhearingyoushould
makey ourviewsknowntotheASTMCommitteeonStandards,atthead dressshownbelow.
ThisstandardiscopyrightedbyAST MInternational,100BarrHarborDrive,POBoxC700,WestCo nshohocken,PA19428-2959,
dualreprints(singleorm ultiplecopies)ofthisstandardmaybeobtainedbycontact ingASTMattheabove
addressorat610-832-9585(phone ),610-832-9555(fax),orservice@(e-mail);orthroughth eASTMwebsite
().Permissionrightstophotocopythes tandardmayalsobesecuredfromtheASTMwebsite(
COPY RIGHT).
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3
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