ASTM G21-2009 合成聚合材料防霉性的测定

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【英文标准名称】:StandardPracticeforDeterminingResistanceofSyntheticPolymericMaterialstoFungi
【原文标准名称】:合成聚合材料防霉性的测定
【标准号】:ASTMG21-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:G03.04
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:
【英文主题词】:fungalbiosusceptability;fungaldecay;microbiologicalassay;microbiologicalsusceptability;Fungalinfluence/resistance--polymers;Polymers;Syntheticpolymers
【摘要】:Thesyntheticpolymerportionofthesematerialsisusuallyfungus-resistantinthatitdoesnotserveasacarbonsourceforthegrowthoffungi.Itisgenerallytheothercomponents,suchasplasticizers,cellulosics,lubricants,stabilizers,andcolorants,thatareresponsibleforfungusattackonplasticmaterials.Toassesmaterialsotherthanplastics,useofthistestmethodshouldbeagreeduponbyallpartiesinvolved.Itisimportanttoestablishtheresistancetomicrobialattackunderconditionsfavorableforsuchattack,namely,atemperatureof2to38x00B0;C(35to100x00B0;F)andarelativehumidityof60to100%.Theeffectstobeexpectedareasfollows:Surfaceattack,discoloration,lossoftransmission(optical),andRemovalofsusceptibleplasticizers,modifiers,andlubricants,resultinginincreasedmodulus(stiffness),changesinweight,dimensions,andotherphysicalproperties,anddeteriorationofelectricalpropertiessuchasinsulationresistance,dielectricconstant,powerfactor,anddielectricstrength.OftenthechangesinelectricalpropertiesaredueprincipallytosurfacegrowthanditsassociatedmoistureandtopHchangescausedbyexcretedmetabolicproducts.Othereffectsincludepreferentialgrowthscausedbynonuniformdispersionofplasticizers,lubricants,andotherprocessingadditives.Attackonthesematerialsoftenleavesionizedconductingpaths.Pronouncedphysicalchangesareobservedonproductsinfilmformorascoatings,wheretheratioofsurfacetovolumeishigh,andwherenutrientmaterialssuchasplasticizersandlubricantscontinuetodiffusetothesurfaceastheyareutilizedbytheorganisms.Sinceattackbyorganismsinvolvesalargeelementofchanceduetolocalaccelerationsandinhibitions,theorderofreproducibilitymayberatherlow.Toensurethatestimatesofbehaviorarenottoooptimistic,thegreatestobserveddegreeofdeteriorationshouldbereported.Conditioningofthespecimens,suchasexposuretoleaching,weathering,heattreatment,etc.,mayhavesignificanteffectsontheresistancetofungi.Determinationoftheseeffectsisnotcoveredinthispractice.1.1Thispracticecoversdeterminationoftheeffectoffungionthepropertiesofsyntheticpolymericmaterialsintheformofmoldedandfabricatedarticles,tubes,rods,sheets,andfilmmaterials.Changesinoptical,mechanical,andelectricalpropertiesmaybedeterminedbytheapplicableASTMmethods.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:5P.;A4
【正文语种】:英语