ANSI/ASTM D6623-2001 用高分辨气相色谱法测定火花式点燃发动机燃料中的单个成份

上一篇: ANSI/ASTM D4814-2001 汽车火花点燃式发动机燃料规范(05.03)
下一篇: ANSI/ASTM D6710-2001 烃基淬火油评价指南

【英文标准名称】:StandardTestMethodforThermal-OxidativeStabilityofPolypropyleneUsingaSpecimenRotatorWithinanOven
【原文标准名称】:用炉内样品旋转器测定丙烯塑料的热氧化稳定性的标准试验方法
【标准号】:ASTMD3012-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:(TestMethod)
【标准水平】:()
【中文主题词】:热学;氧化;塑料;丙烯;耐力;稳定性;测试
【英文主题词】:aging;biaxialrotator;polypropylene;thermalaging;thermaloxidativestability
【摘要】:Underthesevereconditionsofthistestmethod,thespecimensundergodegradationataratethatisdependentuponthethermalenduranceofthepolypropylenematerialunderexamination.Thethermallevelofthistestmethodisconsideredsufficientlyseveretocausefailureofcommercialgradesofheat-stablepolypropylenewithinareasonableperiodoftime.Ifdesired,lowertemperaturescanbeappliedtoestimatetheperformanceofpolypropylenematerialswithlowerheatstability.Thetechniqueofspecimenrotationdescribedinthistestmethodprovidesanestimateofthelife-temperaturerelationshipofpolypropylene.Ifthistestmethodisconductedatdifferenttemperaturesonthesamematerial,amorereliableestimateofthelife-temperaturerelationshipofpolypropyleneisdetermined.ThistestmethodcanbeconductedatseveraltemperaturesandthedatainterpretedthroughuseoftheArrheniusrelation,byplottingthelogarithmsoftimestofailureagainstthereciprocalsofthetemperaturesinkelvins(K).Temperaturesintherangefrom100to150x00B0;C,withintervalsof10x00B0;C,aresuggestedforthispurpose.Thestabilityasdeterminedundertheprescribedtestmethodisnotdirectlyrelatedtothesuitabilityofthecompoundforausewheredifferentconditionsprevail.Thespecimenrotationtechniqueofthermalagingincreasestheprobabilitythatallspecimenswillbeexposedsimilarlyandthattheeffectoftemperaturegradientsinanovenwillbeminimized.1.1Thistestmethodprovidesameansforestimatingtheresistanceofpolypropylene,inmoldedform,toacceleratedagingbyheatinthepresenceofairusingaforceddraftoven.1.2Thestabilitydeterminedbythistestmethodisnotdirectlyrelatedtothesuitabilityofthematerialforusewhendifferentenvironmentalconditionsprevailandshallnotbeusedtopredictperformance.Note1Thespecifiedthermallevelsinthistestmethodareconsideredsufficientlyseveretocausefailureofcommercialgradesofheat-stablepolypropylenewithinareasonableperiodoftime.Ifdesired,lowertemperaturescanbeappliedtoestimatetheperformanceofpolypropylenewithlowerheatstabilities.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinbracketsareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note2ThistestmethodandISO4577-1983aretechnicallysimilarbutdifferentinpreparationoftestspecimens,thicknessoftestspecimen,measurementofthenumberofairflowchangesintheovens,andthenumberofairchangesperhourrequired.1.4Thepurposeofthisappendixistoprovideasecondarymethodfordeterminingthenumberofairexchangesthatoccurwithintheforceddraftovenusedformeasurementofthermaloxidativestability.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:6P.;A4
【正文语种】:


【英文标准名称】:Preinsulatedbondedpipesystemsforundergroundhotwaternetworks-Fittingassembliesofsteelservicepipes,polyurethanethermalinsulationandoutercasingofpolyethylene;GermanversionEN448:1994
【原文标准名称】:地下敷设的远距离供热网络用预隔热连接外皮的管道系统.由钢介质管,聚氨脂绝热和聚乙烯外皮构成的连结管异型件
【标准号】:DINEN448-1994
【标准状态】:作废
【国别】:德国
【发布日期】:1994-12
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:组合套筒管;热绝缘;远距离供热;长距离加热系统;聚乙烯;配件;管道工程系统;聚氨酯;管道配件;钢管;区域供暖;水管;套管
【英文主题词】:polyurethane;districtheating;pipefittings;compositejacketpipes;longdistanceheatingsystems;steelpipes;polyethylene;distantheating;waterpipes;fittings;jackettubes;thermalinsulation;pipework
【摘要】:
【中国标准分类号】:Q83
【国际标准分类号】:91_140_10;23_040_40
【页数】:11P;A4
【正文语种】:德语