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【英文标准名称】:StandardPracticeforCompressionMoldingTestSpecimensofThermosettingMoldingCompounds
【原文标准名称】:热固模制合成材料的压力模制试样的标准操作规程
【标准号】:ASTMD5224-2000(2006)
【标准状态】:现行
【国别】:
【发布日期】:2000
【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】:D20.09
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:试样;试验;铸造(学)
【英文主题词】:allylmoldingcompound;aminomoldingcompound;compressionmolding;phenolicmoldingcompound;plastics;thermoset
【摘要】:Theconditionsatwhichcompoundsaremoldedareknowntoinfluencethepropertiesofthespecimens.Thedegreeofcure,eliminationofknit-linesbetweenparticles,densityofthepart,anddegradationofthepolymerareamongthosefactorswhichwillbeaffectedbythemoldingconditions.Thusitisimportanttoholdtoastandardsetofconditionsinordertohaveavalidcomparisonofpropertiesbetweendifferentcompoundsanddifferentbatchesofthesamecompound.Ifthemoldedspecimensshowevidenceoflow-densityareasduetotrappedgases,theyshouldbediscarded.Abreathestepmaybenecessarytoeliminatethissituation.Itiscriticalthatthebreathestepbeasbriefaspossibletoavoidprecuringofthecompoundbeforefullpressureisapplied.Thiswouldleadtopoorlyx201C;knittedx201D;areasandlowerstrengthinthemoldedspecimen.1.1Thispracticecoversthegeneralprinciplestobefollowedwhencompressionmoldingtestspecimensofthermosettingmoldingcompounds,suchasphenolics,aminoplastics,melaminephenolics,epoxies,andunsaturatedpolyesters.Note18212;Thisstandardissimilarincontent(butnottechnicallyequivalent)toISO295-1974(E).1.2Moldingconditionsaregivenforamino,phenolic,andallylmoldingcompounds.Materialsspecificationstandardsshouldalwaysbeconsultedtodeterminewhetherthematerialtobemoldedhasanyspecialrequirements.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesinbracketsaregivenforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G31
【国际标准分类号】:77_180
【页数】:5P.;A4
【正文语种】: