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【英文标准名称】:StandardPracticeforConditioningPlasticsforTesting
【原文标准名称】:试验用的塑料调节规程
【标准号】:ASTMD618-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D20.50
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:conditioning;humidity;plastics;temperature;Atmospheres--conditioning/testing;Conditioning--electricalinsulatingmaterials;Conditioning--plastics;Electricalinsulatingplastics;Relativehumidity(RH);Specimenpreparation(fortesting)--plastic
【摘要】:Conditioningofspecimensistypicallyconducted:(1)forthepurposeofbringingthematerialintoequilibriumwithnormaloraverageroomconditions,(2)simplytoobtainreproducibleresults,regardlessofprevioushistoryofexposure,or(3)tosubjectthematerialtoabnormalconditionsoftemperatureorhumidityinordertopredictitsservicebehavior.Theconditioningproceduresprescribedinthispracticearedesignedtoobtainreproducibleresultsandhavethepotentialtogivephysicalvaluessomewhathigherorsomewhatlowerthanvaluesunderequilibriumatnormalconditions,dependingupontheparticularmaterialandtest.Dependingonthethickness,typeofmaterialanditsprevioushistory,itispossiblethatitwouldtake20to100daysormoretoensuresubstantialequilibriumundernormalconditionsofhumidityandtemperature.Consequently,conditioningforreproducibilitymustofnecessitybeusedforgeneralpurchasespecificationsandproductcontroltests.1.1Ingeneral,thephysicalandelectricalpropertiesofplasticsareinfluencedbytemperatureandrelativehumidityinamannerthatmateriallyaffectstestresults.Inordertomakereliablecomparisonsbetweendifferentmaterialsandbetweendifferentlaboratories,itisnecessarytostandardizethehumidityconditions,aswellasthetemperature,towhichspecimensofthesematerialsaresubjectedpriortoandduringtesting.Thispracticedefinesproceduresforconditioningplastics(althoughnotnecessarilytoequilibrium)priortotesting,andtheconditionsunderwhichtheyshallbetested.1.2Forsomematerials,itispossiblethatamaterialspecificationexiststhatrequirestheuseofthispractice,butwithsomeproceduralmodifications.Thematerialspecificationtakesprecedenceoverthispractice.Refertothematerialspecificationbeforeusingthispractice.Table1inClassificationD4000liststheASTMmaterialspecificationsthatcurrentlyexist.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThisstandardandISO291addressthesamesubjectmatter,butdifferintechnicalcontent.ISO291describesonlytwotemperatureandhumidityconditionsforconditioningortesting,orboth.
【中国标准分类号】:G31
【国际标准分类号】:29_035_20
【页数】:4P.;A4
【正文语种】:英语