Designation:D6059−96(Reapproved2011)StandardTestMethodforDeterminingConcentrationofAirborneSingle-CrystalCeramicWhiskersintheWorkplaceEnvironmentbyScanningElectronMicroscopy1ThisstandardisissuedunderthefixeddesignationD6059;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthesamplingmethodsandanalysistechniquesusedtoassesstheairborneconcentrationandsizedistributionofsingle-crystalceramicwhiskers(SCCW),suchassiliconcarbideandsiliconnitride,whichmayoccurinandaroundtheworkplacewherethesematerialsaremanufactured,processed,transported,orused.Thistestmethodisbasedonthecollectionoffibersbyfiltrationofaknownquantityofairthroughafilter.Thefilterissubsequentlyevaluatedwithascanningelectronmicroscope(SEM)forthenumberoffibersmeetingappropriatelyselectedmorphologicalandcompositionalcriteria.ThistestmethodhastheabilitytodistinguishamongmanydifferenttypesoffibersbasedonenergydispersiveX-rayspectroscopy(EDS)analysis.Thistestmethodmaybeappropriateforotherman-mademineralfibers(MMMF).1.2Thistestmethodisapplicabletothequantitationoffibersonacollectionfilterthataregreaterthan5µminlength,lessthan3µminwidth,andhaveanaspectratioequaltoorgreaterthan5:1.Thedataaredirectlyconvertibletoastatementofconcentrationperunitvolumeofairsampled.ThistestmethodislimitedbythediameterofthefibersvisiblebySEM(typicallygreaterthan0.10to0.25µminwidthasdeterminedin12.1.5)andtheamountofcoincidentinterfer-enceparticles.1.3Amoredefinitiveanalysismaybenecessarytoconfirmthepresenceoffiberswithdiameters≤0.10to0.25µminwidth.Forthispurpose,atransmissionelectronmicroscope(TEM)isappropriate.TheuseoftheTEMmethodfortheidentificationandsizemeasurementofSCCWisdescribedinPracticeD6058andTestMethodD6056.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthese...
