【英文标准名称】:StandardPracticeforPolyurethaneRawMaterials:PolyurethaneFoamCupTest
【原文标准名称】:聚氨酯原材料的标准试验方法:聚氨酯试杯试验
【标准号】:ASTMD7487-2008
【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】:D20.22
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:creamtime;cuptest;foamtesting;formulatedpolyol;freerisedensity;freeriseheight;freerisetime;initiationtime;isocyanate;polyurethane;pulltime;rawmaterial;resinblend;settleback;sighback;sinkback;stringgeltime;tackfreetime
【摘要】:GeneralUtility:Itisusefultoverifycatalystlevelsinaresinblendorapolyurethanesystem.Thispracticeissuitableforresearch,qualitycontrol,specificationtesting,andprocesscontrol.Limitations:Severalofthemeasuredparametersaresubjective.Therefore,operator-to-operatorvariabilityandlab-to-labvariabilitycanbemuchhigherthanthatofasingleoperator.Thevariabilityofthispracticeisdependentontheconsistencyofmixingofthereactants.Theestimationofprecisioninthispracticeisbasedontypicalformulationsforrigidandflexiblefoams.Formulationswithfasterreactiontimeswilllikelyhavegreatervariability,particularlycreamtime(initiationtime).Formulationswithslowerreactiontimeswilllikelyhavegreatervariabilityinthemeasurementoffreerisetime.Itispossiblethatlow-level(ppm,ppb)ingredientcontaminationwillnotbedetectableusingthispractice.Confirmationofsuchcontaminationwillpotentiallyrequirelarge-scale(~20litres)testsandisoutofthescopeofthispractice.1.1Thispracticecoversthedeterminationofcreamtime(initiationtime),topofcuptime,freerisetime,freeriseheight,stringgeltime(pulltime),tackfreetime,settleback,andfreerisedensityofpolyurethanefoamformulationsusingacupfoamtest.1.2Typicaldefinitions,terms,andtechniquesaredescribed;includingproceduresformixingandtransferringsamplestothefoamingcontainer;anddatagatheringandevaluation.However,agreementbetweenthecustomerandthetestinglaboratoryforalltheseitemsmustbeobtainedpriortouse.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnoknownISOequivalenttothisstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_080_10
【页数】:5P.;A4
【正文语种】:英语