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1、Designation:E546?14StardTestMethodfFrostDewPointofSealedInsulatingGlassUnits1ThisstardisissuedunderthefixeddesignationE546thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisionthey

2、earoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.ThisstardhasbeenapprovedfusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Th

3、istestmethoddescribesalabatyprocedurefdeterminingthefrostdewpointwithintheairspace(s)ofsealedinsulatingglassunitsestablishesthecriteriafdeterminingwhetherthatpointisbelowaboveagivenspecifiedtemperature.1.2Thistestmethoda

4、lsodescribestheapparatustobeusedfthesedeterminations.1.3Thevaluesstatedininchpoundunitsaretoberegardedasstard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedfinfmationonlyarenotconsideredsta

5、rd.1.4Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritou

6、se.Fspecifichazardstatementssee9.1.3.2.ReferencedDocuments2.1ASTMStards:2C1036SpecificationfFlatGlassE77TestMethodfInspectionVerificationofThermometersE576TestMethodfFrostDewPointofSealedInsulatingGlassUnitsintheVertical

7、PositionE631TerminologyofBuildingConstructions3.Terminology3.1Definitions—FdefinitionsofgeneraltermsusedinthistestmethodrefertoTerminologyE631.3.2DefinitionsofTermsSpecifictoThisStard:3.2.1frostdewpointn—thetemperatureat

8、whichwaterganicvapotherchemicalsbegintoappearontheinteriglasssurfaceofasealedinsulatingglassunitincontactwiththemeasuringsurfaceofthefrostdewpointapparatus.3.2.2froststate—thecasewherethefrostdewpointofasealedinsulatingg

9、lassunitisabovethetesttemperaturespecifiedbythepurchaseruser.3.2.3nofroststate—thecasewherethefrostdewpointofasealedinsulatingglassunitisbelowthetemperaturespecifiedbythepurchaseruser.4.SummaryofTestMethod4.1Thistestmeth

10、odisconductedbytheuseofaspecialapparatusconsistingbasicallyoftwochilledcylindricalmetalblockspositionedoneovertheotherseparatedbyagapofcontrollabledistance.Theupperblockhasanexposedflatcircularsurface1in.(25mm)indiameter

11、canbechilledtofarbelowtheicepointbyregulatingtheairgapdistancebetweenitthelowermetalblockwhichismaintainedatapproximately?109F(?78C)bydryice.Thetestspecimenisplacedincontactwiththischilledflatcircularsurfaceoftheupperblo

12、ckfspecifiedshtperiodsoftimewiththemetalsurfaceatsuccessivelylowertemperaturestodetermineatwhattemperaturefrostappearsonthecrespondinglowerairspaceglasssurface.5.SignificanceUse5.1Thistestmethodtheapparatusdescribedarein

13、tendedprimarilyfsealedinsulatingglassunitspositionedhizontally.Iftheprocedureisappliedtosuchunitsinotherthanahizontalpositiontheresultsmaynotbecomparabletothoseobtainedbythisprocedure.NOTE1—AsimilarmethodisTestMethodE576

14、.1ThistestmethodisunderthejurisdictionofASTMCommitteeE06onPerfmanceofBuildingsisthedirectresponsibilityofSubcommitteeE06.22onDurabilityPerfmanceofBuildingConstructions.CurrenteditionapprovedDec.12014.PublishedDecember201

15、4.iginallyapprovedin1975.Lastpreviouseditionapprovedin2008asE546–08.DOI:10.1520E054614.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard

16、’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1ice(?109F(?78C)).Becausethesolidmetalblocksarehighlyconductivethetemperatureofeachisvirtu

17、allyunifm.Useofthecontrolringadjuststheairgapdistancebetweenthetwoblockstogivethedesiredthermalresistanceacrosstheairgap.Thecircularmeasuringsurfaceoftheupperblockisthusreadilyadjustedtothedesiredtemperaturewhileincontac

18、twiththetestspecimen.Thecircularmeasuringsurfacediameterspecifiedissuitableffrostdewpointmeasurementofglassupto1?4in.(6.0mm)thick.6.1.1UpperLowerMetalBlocksaluminumalloythatmaybeanodizedconfmingtothedimensionsshowninFig.

19、1.Otherpartsoftheapparatusmaybefabricatedfromanyappropriatematerials.6.1.2CalibratedTemperatureMeasuringDevicesuchasathermocouplethermistbimetallicthermometerhavingasuitablerangegraduatedin2F(1C)smallerunitsanaccuracyof6

20、1F(60.5C)overthefullscale.AsuggestedcalibrationofthebimetallicthermometerisdescribedinAppendixX1.6.1.3Thesizeofthetemperaturemeasuringprobeshallmatchthebesizedrilledintothealuminumheadindertoensurepropertemperaturemeasur

21、ements.7.TestSpecimen7.1Thespecimentobetestedshallberepresentativeoftheunitstobeevaluatedcapableofbeingpositionedhizontally.8.Conditioning8.1Pritotestingconditionthetestspecimenatatemperatureof7565F(2463C)fnotlessthan24h

22、.9.Procedure9.1PreparationofApparatus:9.1.1Disassembletheapparatusbytakingoutthedryicecontainerretainerspringassembly.Carefullycleanthemeasuringsurfacewithasoftclothpaper.Donotscratchthemeasuringsurface.Wipecleantheappar

23、atusthoughlyifanymoistureiscondensedonthesurfaceswalls.9.1.2Assemblethedryicecontainerturnthecontrolringsothattheairgapdistancebetweenupperlowermetalblocksisabout0.5in.(13mm).Inverttheapparatusontoasoftcloth.9.1.3Sprayal

24、coholacetone(Warning—Bothalcoholacetoneareflammable.)onthefinofthedryicecontainertoensuregoodcontactwiththedryice.Compactlygethecontainerwiththecrushedpulverizeddryiceuptothe“full”mark.Compressthedryicewiththespringassem

25、blylockthecoverlid.9.1.4Returntheapparatustoanuprightpositionsecureitontoahizontalsurface.Allowsufficienttimefthetemperatureofthelowermetalblocktoapproachthatofthedryicetemperature.9.2RegingofApparatus:9.2.1Duringthetest

26、procedurereplenishthesupplyofdryicewheneveritbecomesdepletedbyturningtheapparatusupsidedownonasoftclothopeningthecoverlidtakingouttheretainerspringassemblyrepeatingsteps9.1.39.1.4.9.3DeterminationofFrostStateNoFrostState

27、:9.3.1gethefrostdewpointapparatuswithdryiceasdescribedin9.19.2.9.3.2Cleanbothexterisurfacesofthespecimen.9.3.3Duetothechangesinthecoldplatedesigntheuseofthealuminizedpolyesterfilmisnolongerarequirement.Howeveritisstillre

28、commendedindertoensureapristineviewingsurface.9.3.4Ifthereflectivefilmisusedusethefollowingprocedure:Placeapieceofsilvercoledaluminizedpolyesterfilm3(highlyreflectivemirrsurfacenotthickerthan0.003in.(0.08mm)1in.(25mm)ind

29、iameter1by1in.(25by25mm)onthemeasuringsurfacebywettingbothsurfacesofthefilmwithacetonealcohol(Warning—See9.1.3).Centerthespecimenontheapparatus.Examinethelowerairspaceglasssurfaceintheregionwherefrostistobedepositedtobea

30、wareofanydirtotherfeignparticlesthatmightbemistakenffrost.Notehoweverthatasmallfeignparticleonthelowerairspaceglasssurfacemaybehelpfulinfocusingonthesurfacewherethefrostistobedeposited(seeFig.2).9.3.5Slowlyreducetheairga

31、pdistancebetweenupperlowermetalblocksbyturningthecontrolringwhilewatchingthetemperatureoftheuppermetalblock.9.3.6Bringthetemperatureoftheuppermetalblocktothetemperaturetobecheckedffroststabilizeitbyfineadjustmentofthecon

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