Designation:C1338−19StandardTestMethodforDeterminingFungiResistanceofInsulationMaterialsandFacings1ThisstandardisissuedunderthefixeddesignationC1338;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheabilityofnewinsulationmaterialsandtheirfacingstoresistfungalgrowth.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.SignificanceandUse2.1Thetypeofmaterialsusedinthemanufactureofinsulationproductsandthetypeofmembraneusedtofacetheseproductscansometimesaffectfungisustenanceinthepresenceofhighhumidity.2.2Thistestmethodisusedtodeterminetherelativeabilityofaninsulationanditsfacingtoresistfungalgrowthunderconditionsfavorablefortheirdevelopment.2.3Thistestmethodusesacomparativematerialtodeter-minetherelativeabilityofamaterialtoresistfungalgrowth.Insomespecializedproductareas,itisrequiredthatnogrowthtakeplace.Insuchcases,theuseofthecomparativematerialisomittedandthepass/failcriterionisbasedupongrowth.3.Apparatus3.1Glassware—Steriledisposablepetridishes,4or6in.(100or150mm)by0.6or0.75in.(15or20mm)insizearepreferred.Forlargerspecimens,traysofborosilicateglass...
