ASTM D2115-2010 聚(氯乙烯)合成物的烘箱热稳定性标准实施规程
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【英文标准名称】:StandardPracticeforOvenHeatStabilityofPoly(VinylChloride)Compositions
【原文标准名称】:聚(氯乙烯)合成物的烘箱热稳定性标准实施规程
【标准号】:ASTMD2115-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D20.15
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:heatstability;poly(vinylchloride);Thermalstability--plastics;Ovenheatstability;Poly(vinylchloride)(PVC)
【摘要】:Poly(vinylchloride)compositionsdegradebydiscolorationonprolongedexposuretoheat.Thedegreeofdiscolorationisrelatedtotheconditionofexposure,suchaslengthofperiodandtemperature.Whentheconditionsofexposurearefixedandcontrolled,thentherelativeresistancetodiscolorationduetoheatoftwoormorecompositionsisabletobedetermined.Theprecisionofheatstabilitytestingisalsodependentonthethicknessofthespecimensandthehistoryofheatexposurepriortotesting.Thispracticeallowsforcontrolorthereportingofthesevariables.Thispracticeisparticularlyapplicablefordetermininggrossdifferencesintheheatstabilitiesofpoly(vinylchloride)compositionsthataredetectableasacolorchange.Itisnotintendedtomeasureabsolutethermalstability.Althoughtheobservedcolorchangesmaybeevidenceofdegradation,moleculardegradationphenomenasuchaschain-scissionorcross-linkingmaynotbeidentifiable.Note28212;Whilediscolorationcausedbyexposuretoelevatedtemperatureiscommonlyregardedasevidenceofdegradationinpoly(vinylchloride)compositions,itmustbeborneinmindthatsomevinylcompositionsmayundergosubstantialchangeincolorwithoutappreciablelossofmechanicalstrength,chemicalresistance,etc.,whereasothersmayresistchangeincoloryetundergosubstantialchangeinotherproperties.Therefore,resistancetodiscolorationshouldnotbetakenassoleevidenceofthermalstability.Itisrecommendedthatthistestbesupplementedbyotherssuchastensilestrengthandelongation,impactstrength,anddeflectiontemperatureunderload(forrigidcompositions),Durometerhardness(fornonrigidcompositions),anddilutesolutionviscosity,andthatthetestresultsbeforeandafterovenexposurebecomparedtodeterminethedegreeofdegradationwhichhasbeenproducedineachofthepropertiesmeasured.Thispracticeisabletopredicttherelativediscolorationinprocessing,providedthatthecompositionsinquestionaretestedattherelativemaximumtemperaturesdevelopedinprocessing.Thispracticeisnotapplicabletomaterialsthatwillcross-contaminateduringovenexposure.1.1Thispracticelistsproceduresfordeterminingtherelativethermalstabilityofsheetormoldedpoly(vinylchloride)compoundsasindicatedbydiscolorationduetoexposuretoanelevatedtemperatureatcontrolledovenconditions.1.2Aspecimenpreparationtechniqueusingatwo-rollmillisprovidedforcompositionsthatarenotinmoldedorsheetedform.1.3Thispracticeisnotintendedforuseinpurchasingspecificationsbecausetheconditionsofprocessingplasticcompoundsvarywidely,andthedegreeofcorrelationofdataobtainedbythispracticetoprocessexposurehasnotbeendetermined.However,despitethislimitation,thispracticedoesyielddataofvalueinjudgingthecomparativeservicequalityofpoly(vinylchloride)compositions.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesaregivenforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;Thisstandardissimilarincontent,butnottechnicallyequivalenttoISO305x2013;1990.
【中国标准分类号】:G95
【国际标准分类号】:83_080_20
【页数】:3P.;A4
【正文语种】:英语
【原文标准名称】:聚(氯乙烯)合成物的烘箱热稳定性标准实施规程
【标准号】:ASTMD2115-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D20.15
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:heatstability;poly(vinylchloride);Thermalstability--plastics;Ovenheatstability;Poly(vinylchloride)(PVC)
【摘要】:Poly(vinylchloride)compositionsdegradebydiscolorationonprolongedexposuretoheat.Thedegreeofdiscolorationisrelatedtotheconditionofexposure,suchaslengthofperiodandtemperature.Whentheconditionsofexposurearefixedandcontrolled,thentherelativeresistancetodiscolorationduetoheatoftwoormorecompositionsisabletobedetermined.Theprecisionofheatstabilitytestingisalsodependentonthethicknessofthespecimensandthehistoryofheatexposurepriortotesting.Thispracticeallowsforcontrolorthereportingofthesevariables.Thispracticeisparticularlyapplicablefordetermininggrossdifferencesintheheatstabilitiesofpoly(vinylchloride)compositionsthataredetectableasacolorchange.Itisnotintendedtomeasureabsolutethermalstability.Althoughtheobservedcolorchangesmaybeevidenceofdegradation,moleculardegradationphenomenasuchaschain-scissionorcross-linkingmaynotbeidentifiable.Note28212;Whilediscolorationcausedbyexposuretoelevatedtemperatureiscommonlyregardedasevidenceofdegradationinpoly(vinylchloride)compositions,itmustbeborneinmindthatsomevinylcompositionsmayundergosubstantialchangeincolorwithoutappreciablelossofmechanicalstrength,chemicalresistance,etc.,whereasothersmayresistchangeincoloryetundergosubstantialchangeinotherproperties.Therefore,resistancetodiscolorationshouldnotbetakenassoleevidenceofthermalstability.Itisrecommendedthatthistestbesupplementedbyotherssuchastensilestrengthandelongation,impactstrength,anddeflectiontemperatureunderload(forrigidcompositions),Durometerhardness(fornonrigidcompositions),anddilutesolutionviscosity,andthatthetestresultsbeforeandafterovenexposurebecomparedtodeterminethedegreeofdegradationwhichhasbeenproducedineachofthepropertiesmeasured.Thispracticeisabletopredicttherelativediscolorationinprocessing,providedthatthecompositionsinquestionaretestedattherelativemaximumtemperaturesdevelopedinprocessing.Thispracticeisnotapplicabletomaterialsthatwillcross-contaminateduringovenexposure.1.1Thispracticelistsproceduresfordeterminingtherelativethermalstabilityofsheetormoldedpoly(vinylchloride)compoundsasindicatedbydiscolorationduetoexposuretoanelevatedtemperatureatcontrolledovenconditions.1.2Aspecimenpreparationtechniqueusingatwo-rollmillisprovidedforcompositionsthatarenotinmoldedorsheetedform.1.3Thispracticeisnotintendedforuseinpurchasingspecificationsbecausetheconditionsofprocessingplasticcompoundsvarywidely,andthedegreeofcorrelationofdataobtainedbythispracticetoprocessexposurehasnotbeendetermined.However,despitethislimitation,thispracticedoesyielddataofvalueinjudgingthecomparativeservicequalityofpoly(vinylchloride)compositions.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesaregivenforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;Thisstandardissimilarincontent,butnottechnicallyequivalenttoISO305x2013;1990.
【中国标准分类号】:G95
【国际标准分类号】:83_080_20
【页数】:3P.;A4
【正文语种】:英语
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