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【英文标准名称】:Plastics-Determinationofthermalstabilityofpoly(vinylchloride)relatedchlorine-containinghomopolymersandcopolymersandtheircompounds-Discolorationmethod
【原文标准名称】:塑料.与聚氯乙烯相关的含氯聚合物、共聚物及其混合物的热稳定性的测定.色变法
【标准号】:BSENISO305-1999
【标准状态】:现行
【国别】:英国
【发布日期】:1999-09-15
【实施或试行日期】:1999-09-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:试验;聚氯乙烯;斑渍;热稳定性;测定;热试验;塑料;共聚物
【英文主题词】:Copolymers;Determination;Inspection;Inspectionbyattributes;Mouldings(shapedsection);Plastics;Polyvinylchloride;Stains(discoloration);Testspecimens;Testing;Thermalpropertiesofmaterials;Thermalstability;Thermaltesting
【摘要】:1ThisInternationalStandardspecifiestwomethodsforthedeterminationofthethermalstabil-ityofproductsandcompoundsbasedonvinylchloridehomopolymersandcopolymers(referredtosimplyasPVCinthefollowingtext)bytheextentofthediscolorationthatoccurswhentheyareex-posed,Intheformofsheet,toelevatedtemper-atures.—MethodA:Oil-bathmethod—MethodB:Ovenmethod2ThesemethodsareparticularlyapplicabletothedeterminationoftheresistanceofPVCtode-gradationbyheat,asassessedbythechangeincolourafterdifferenttimesofheatingunderstand-ardizedconditions.Theresultsarecomparativeonly,andmaybeunsatisfactorywhencolouredPVCmaterialsaretested.3MethodAisasimplemethod,whichrequireslittleexpenditureonapparatusandpermitsmateri-alstobetestedalmostIntheabsenceofair.MethodBrequiresaforced-airoven,inwhichtheairflowIsadjustedtoprovideasufficientlyuniformtemperaturethroughouttheentiretestarea.Thismethodisnotapplicabletomaterialsthatwillcross-contaminateduringovenexposure.Thestabilitytimesgivenbythetwomethodsmaynotbesimilarandcannotbeusedfordirect-comparisonpurposes.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:12P.;A4
【正文语种】:英语