【英文标准名称】:StandardTestMethodforMeasurementofTransitionTemperaturesofPetroleumWaxesbyDifferentialScanningCalorimetry(DSC)
【原文标准名称】:用差示扫描量热法测定石油蜡转变温度的标准试验方法
【标准号】:ASTMD4419-1990(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:1990
【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】:D02.10.0A
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:differentialscanningcalorimetry;petroleumwax;thermalproperties;transitiontemperature;Differentialscanningcalorimetry(DSC);Petroleumwax;Solidphasematerials;Temperaturetests--petroleumproducts
【摘要】:DSCinaconvenientandrapidmethodfordeterminingthetemperaturelimitswithinwhichawaxundergoesduringtransitions.Thehighesttemperaturetransitionisasolid-liquidtransitionassociatedwithcompletemelting;itcanguidethechoiceofwaxstorageandapplicationtemperatures.Thesolid-solidtemperaturetransitionisrelatedtothepropertiesofthesolid,thatis,hardnessandblockingtemperature.Note28212;Forarelativelynarrowcutpetroleumwax,thelowesttransitionwillbeasolid-solidtransition.Anarrowcutwaxisoneobtainedbydeoilingasinglepetroleumdistillatewithamaximumrangeof120x00B0;Fbetweenits5%and95%volinaccordancewithTestMethodD1160boilingpoints(convertedto760torr).TheDSCmethodcannotdifferentiatebetweensolid-liquidandsolid-solidtransitions.Suchinformationmustbepredeterminedbyothertechniques.Inthecaseofblends,thelowertemperaturetransitionmaybeenvelopesofbothsolid-liquidandsolid-solidtransitions.Sincepetroleumwaxisamixtureofhydrocarbonswithdifferentmolecularweights,itstransitionsoccuroveratemperaturerange.Thisrangeisonefactorthatinfluencesthewidth,expressedinx00B0;C,oftheDSCpeaks.Thehighesttemperaturetransitionisafirst-ordertransition.If,foraseriesofwaxes,thereissupportingevidencethatthehighesttemperaturetransitionofeachwaxisthemajorfirst-ordertransition,itsrelativewidthshouldcorrelatewiththerelativewidthofthewax''smolecularweightdistribution.1.1Thistestmethodcoversthetransitiontemperaturesofpetroleumwaxes,includingmicrocrystallinewaxes,bydifferentialscanningcalorimetry(DSC).Thesetransitionsmayoccurasasolid-solidtransitionorasasolid-liquidtransition.1.2Thenormaloperatingtemperaturerangeextendsfrom15x00B0;Cto150x00B0;C(Note1).1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:E42
【国际标准分类号】:75_140
【页数】:4P.;A4
【正文语种】:英语


Product Code:SAE AMS3198
Title:Sponge, Chloroprene (CR) Rubber, Medium Stiffness
Issuing Committee:Ams Ce Elastomers Committee
Scope:This specification covers a chloroprene (CR) rubber sponge in the form of sheet, strip, molded shapes, or other forms, as ordered. These products have been used typically for general applications requiring the use of open-cell, medium sponge rubber pads and seals operating from -40 to +80 degrees C (-40 to +176 degrees F), but usage is not limited to such applications.