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1、Designation:D1155?10(Reapproved2015)StardTestMethodfRoundnessofGlassSpheres1ThisstardisissuedunderthefixeddesignationD1155thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisionthey

2、earoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethod2coversthedeterminationofthepercentoftruespheresinglass

3、spheresusedfretreflectivemarkingpurposesindustrialuses.1.2Thistestmethodincludestwoproceduresasfollows:1.2.1ProcedureAinwhichtheedspecimenissplitintotwosizerangesgroupspritoseparationintotruespheresirregularparticles1.2.

4、2ProcedureBinwhichtheedspecimenissplitintofivesizerangesgroupspritoseparation.1.2.3IndeterminingcompliancewithspecificationrequirementseitherProcedureAProcedureBmaybeused.Wheretestsindicatefailuretomeetthespecifiedpercen

5、toftruespheresirregularparticlestherefereetestshallbemadeinaccdancewithProcedureB.1.3ThevaluesstatedinSIunitsaretoberegardedasthestard.Thevaluesgiveninparenthesesarefinfmationonly.1.4Thisstarddoesnotpurpttoaddressallofth

6、esafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:3E11S

7、pecificationfWovenWireTestSieveClothTestSievesE177PracticefUseoftheTermsPrecisionBiasinASTMTestMethodsE691PracticefConductinganInterlabatyStudytoDeterminethePrecisionofaTestMethod2.2OtherDocument:ASTMMNL32ManualonTestSie

8、vingMethods3.SummaryofTestMethod3.1Theglassparticlesaremechanicallyseparatedintotruespheresirregularparticlesbycontrolledvibrationonaglassplatefixedatapredeterminedslope.4.SignificanceUse4.1Theroundnessofglassspheresison

9、emeasurableaspectrelatingtotheirperfmanceasaretreflectivemedia.Thefunctionofthistestmethodistomeasurethepercentoftruespheresasrelatedtocompliancewithapplicablespecifications.NOTE1—Thismethodhasbeenusedinotherindustrialar

10、easoutsidetheintendedscopeofthistestmethod.5.Apparatus(Fig.1)5.1ElectricalFeederVibratuponwhichismountedasmoothglasspanel152.4mm(6in.)wide381mm(15in.)long.5.2HingedBasesupptingthevibratpanelinsuchamannerthattheangleofslo

11、peoftheglasspanelwiththehizontalmaybevariedfixedinanypredeterminedposition.5.3Vibrat—Meansofvaryingtheamplitudestrengthofthevibrationstransmittedtotheglasspanelatafixedfrequencyof60impulsespersecond.5.4FeedingDevicePan(O

12、ptional)affixedtotheglasspanelinsuchamannerthattheedsampleofglassmaybeevenlypedataunifmrateupontheglasspanelfromvariousheightsabovethepanelatvariouspointsontheslope.5.5CollectingPansContainersateitherendoftheslopingpanel

13、inwhichtocollectthespheresirregularparticles.5.6DigitalLevelapproximately30to60cm(12to24in.)inlength(notshown).1ThistestmethodisunderthejurisdictionofASTMCommitteeD01onPaintRelatedCoatingsMaterialsApplicationsisthedirect

14、responsibilityofSubcommitteeD01.44onTrafficCoatings.CurrenteditionapprovedJune12015.PublishedJune2015.iginallyapprovedin1951.Lastpreviouseditionapprovedin2010asD1155–10.DOI:10.1520D115510R15.2Finfmationonthedevelopmentof

15、thistestmethodreferencemaybemadetothepaperbyKeeleyA.E.“RoundnessTestingofGlassSpheres”ASTMBulletinNo.174May1951p.72.3FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsv

16、olumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1byslowlypouringfromaheightof13mm(1?2in.)toapointinthecentero

17、ftheplateonethirddownfromtheuphillend.7.3Placethesizegrouptobetestedinthefeedpanunlessmanualfeedingisbeingusedstartthevibrat.Setthevibratamplitudecontrolatsuchapositionthatirregularparticlesontheupperhalfofthepanelwillmo

18、veslowlyuptheslopewhilethetruespheresrolldown.Feedslowlyatsucharatethatno“bunchingup”floodingofspheresonthepaneloccurs.7.4Whentheglasspaneliswellcoveredwithspheresstopfeedinguntilseparationoftruesphereshasoccurred.Stopth

19、evibratafteralltruesphereshaverolleddowntheslopeintothespherepanbrushscrapeallparticlesremainingonthepanelintotheupperpancontainingtheirregularparticles.Fpurposeoftestallparticlesnotrollingfreelydowntheslopeareconsidered

20、asirregular.7.5Repeattheproceduredescribedin7.37.4untiltheedsizegrouphasbeencompletelyseparatedremovingthetruespheresirregularparticlesfromthecollectingpansintoappropriatecontainers.7.6Usingthetruespherescollectedinthepr

21、imaryseparationrepeattheproceduredescribedin7.37.4.Nextfeedusingtheirregularparticlescollectedintheprimaryseparationagainrepeattheproceduredescribedin7.37.4.Examinetheseparatedspheresirregularparticlesundera20diametermag

22、nifyingglassrepeatthererunsuntilsatisfactyseparationisobtained.7.7Determinethetotalweightsofthetruespheresoftheirregularparticlesobtainedbytheaboveseparationsrecd.7.8Usingthesecondsizegroupobtainedinaccdancewith7.1repeat

23、theproceduredescribedin7.2–7.7settingtheangleoftheroundometerplatetothe100U.S.Sievesettingof3.9degrees(fromthetableinFig.2)usingadigitallevel.7.9Fromthetotalweightoftruespheresobtainedfrombothsizegroupscalculatethepercen

24、toftruespheresinthetotalspecimenusingas100%thetotalweightoftruespheresplusirregularparticlescollectedinthetest—therebyeliminatingfromthecalculationanylossofspheresthatmayhaveoccurredduringhlingtesting.8.ProcedureB8.1Divi

25、dethespecimenintofivesizerangesgroupsasfollows:PassingSieveRetainedonSieve600m(No.30)425m425m(No.40)300m300m(No.50)212m212m(No.70)...NOTE3—Thepurchaserspecifyingagencymayrequirealternativesievesizestobeusedinlieuoftheabo

26、vereferencesizesinthedeterminationofroundness.8.2LeveltheglasspanelthensettheangleoftheroundometerplatetothevalueindicatedinTable1fthesievefractionbeingtested.Fexamplethesievefractionpassingthe600mSieve(No.30)retainedont

27、he425mSieve(No.40)the425m(No.40)Sievesettingshouldbeused(1.5degrees).Affixthefeedhopperoverthecenterlineofthepanelattheupperonethirdpointoftheslopewiththefeedendupslopeapproximately13mm(1?2in.)fromtheglasspanel.Alternati

28、velythematerialmaybemanuallyfedbyslowlypouringfromaheightof13mm(1?2in.)toapointinthecenteroftheplateonethirddownfromtheuphillend.8.3Placethesizegrouptobetestedinthefeedpanunlessmanualfeedingisbeingusedstartthevibrat.Sett

29、hevibratamplitudecontrolatsuchapositionthatirregularparticlesontheupperhalfofthepanelwillmoveslowlyuptheslopewhilethetruespheresrolldown.Feedslowlyatsucharatethatno“bunchingup”floodingofspheresonthepaneloccurs.8.4Whenthe

30、glasspaneliswellcoveredwithspheresstopfeedinguntilseparationoftruesphereshasoccurred.Stopthevibratafteralltruesphereshaverolleddowntheslopeintothespherepanbrushscrapeallparticlesremainingonthepanelintotheupperpancontaini

31、ngtheirregularparticles.Fpurposesofthistestallparticlesnotrollingfreelydowntheslopeareconsideredasirregular.8.5Repeattheproceduredescribedin8.38.4untiltheedsizegrouphasbeencompletelyseparatedremovingthetruespheresirregul

32、arparticlesfromthecollectingpansintoappropriatecontainers.8.6Usingthetruespherescollectedintheprimaryseparationrepeattheproceduredescribedin8.38.4.Nextfeedusingtheirregularparticlescollectedintheprimaryseparationagainrep

33、eattheproceduredescribedin8.38.4.Examinetheseparatedspheresirregularparticlesundera20diametermagnifyingglassrepeatthererunsuntilsatisfactyseparationisobtained.TABLE1PercentTrueSpheres(Rounds)RepeatabilityStardDeviationRe

34、producibilityStardDeviationRepeatabilityLimitReproducibilityLimitSieveSize%TrueSpheresAverageASampleSize(g)sxsrsRrR3023.1871.6001.3422.0762.1625.8136.0534045.66910.6672.7192.1303.2285.9639.0375072.20214.6551.553.9821.748

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