ASTM D1896/D1896M-2010 热固化合物的传递模塑试样的标准实施规程

时间:2024-03-01 16:19:57 来源: 标准资料网 作者:标准资料网 阅读:8725
下载地址: 点击此处下载
【英文标准名称】:StandardPracticeforTransferMoldingTestSpecimensofThermosettingCompounds
【原文标准名称】:热固化合物的传递模塑试样的标准实施规程
【标准号】:ASTMD1896/D1896M-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:
【英文主题词】:testspecimens;thermosettingcompounds;transfer-molding;Molding/extrusioncompounds/materials;Thermosettingplastics
【摘要】:Transfermoldingisparticularlysuitedtothermosettingmaterialsofintermediateplasticity.Fixedmoldingparameterscannotbespecifiedforeachtypeofmaterial.MoldingcompoundsofthesametypecomeinmanydifferentplasticitiesmeasuredinaccordancewithTestMethodsD3123andD3795.Consequently,foragivenmaterialtype,themoldingparametersrequiredtoproducesatisfactorytestspecimenswilloftenvarydependentontheplasticityofthespecificmaterialgrade.Themoldshowninthispracticeprovidesforasetoffivespecimens.However,ifonlycertainspecimensaredesired,theothercavitiescanbeblockedbyinsertinggateblanks.Typically,breathingofthemoldisnotrequiredtoreleasetrappedvolatilematterasthegasisfreetoflowfromtheventendofthemold.Thisisaparticularadvantageforheat-resistantcompoundsandreducesthetendencyformoldedspecimenstoblisterathighexposuretemperatures.Flowandknitlinesinamoldedpieceareoftensitesofmechanicalorelectricalweaknessandcanbefoundinsomedegreeofseveritythroughoutthemoldedpiece.Thesemisolidmoldingcompoundpassingthroughthegateissubjecttonon-Newtonianflowand,consequently,wrinklesandfoldsasittravelsdownthemoldcavity.Fibersandotherreinforcementsinthemoldingcompoundalignwiththeflowpatternand,consequently,canorientperpendiculartotheaxisofthebaratthecenterandparallelatthesurfaceofthebar.Moldtemperature,thermalconductivityandplasticityofthemoldingcompound,degreeofpreheat,andplungerpressureareparametersthatinfluencethetimetofillthemoldcavitiesandtheformationofknitlines.Note38212;Ifthetemperatureofthemoldisheldconstantandtheplungerpressurevariedforadesignatedthermosettingmoldingcompound,twoextremecharacteristicconditionscanbeobtained.Ifthepressureislow,thentheventendofthecavitywillnotfullyfill,andweldlineswillformbyincompleteknittingofthematerial.Ifthepressureistoohigh,themoldcavitywillfillfast,theoutsideofthespecimenwillcasehardenwhilethepressureisstillforcingmaterialoutthevent,andaball-and-socketgrainstructurewillbeobtained.Aball-and-socketstructureisanindicationofthemoldingcondition,andlowertestdatawillresult.Thermosettingcompoundscontaininglong-fiberfillerssuchasglassroving,choppedcloth,orshavingscanbeusedbutarenotrecommendedfortransfermolding.Thesefillermaterialstendtobreak,tear,orballinpassingthroughthegatesofthemold,therebynotoptimizingtheirpotentialstrength.TheIzodimpactstrengthoftransfermoldedspecimensofmoldingcompoundscontainingshortfiberswillgenerallybelowerthanthevaluesobtainedusingcompression-moldingmethods.Quiteoftentheimpactstrengthwillvaryalongtheaxisofthebarduetomoldingparameters,flowpattern,andfiberorientation.Theflexuralandtensilestrengthoftransfermoldedspecimensofmoldingcompoundscontainingshortfiberswillgenerallybehigherthanthevaluesobtainedusingcompression-moldingmethods.Flexuraltestsareparticularlysensitivetotransfermoldingduetothethinresinskinformedatthesurfaceofthebarduringthefinalfillingofthecavityandpressurebuildup.1.1Thispracticecoversageneralprocedureforthetransfermoldingofmechanicalandelectricaltestspecimensofthermosettingmoldingmaterials.Note18212;Theutilityofthispracticehasbeendemonstratedforthemoldingofthermosettingmoldingcompoundsexhib......
【中国标准分类号】:G31
【国际标准分类号】:83_140_99
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Methodsoftestforpaint-Durabilitytestsonpaintfilms-Determinationofresistancetocorrosionunderawet(saltfog)/dry/humiditycycle
【原文标准名称】:涂料试验方法.涂膜的耐久性试验.第F18部分:耐湿(盐雾)/干热/湿气循环腐蚀测定
【标准号】:BS3900-F18-1998
【标准状态】:作废
【国别】:英国
【发布日期】:1998-08-15
【实施或试行日期】:1998-08-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:试样;覆层;中性盐雾试验;试验持续时间;湿热试验;纯度;湿空气试验;人工气候环境试验;试验设备;涂料;腐蚀试验;周期的;环境试验;清漆;试验条件;干热试验
【英文主题词】:humidityaffects;corrosiontests;paintcoat;corrosionresistance;varnishes;resistance;coatings;corrosioncondition;paints;determination
【摘要】:
【中国标准分类号】:G50
【国际标准分类号】:87_040
【页数】:16P;A4
【正文语种】:英语


【英文标准名称】:Hand-heldnon-electricpowertools-Safetyrequirements-Part5:rotarypercussivedrills.
【原文标准名称】:手持非电动工具.安全性要求.第5部分:旋转敲击动力钻
【标准号】:NFE65-100-5/IN1-2008
【标准状态】:作废
【国别】:法国
【发布日期】:2008-11-01
【实施或试行日期】:
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Coredrills;Definitions;Drillhammers;Drillingbits;Drillingmachines;Drills;Equipmentsafety;Ergonomics;Handtools;Hazards;Hydraulicfluids;Impactdrills;Machines;Manual;Manualoperation;Manuallyoperatedmachines;Marking;Mechanicalsafety;Noiseemissions;Non-electrical;Operatinginstructions;Pedestrian-controlledsystems;Percussiondrilling;Percussiondrills;Powered;Safety;Safetyengineering;Safetyofmachinery;Safetyrequirements;Specification(approval);Testing;Tools;Vibration;Warningnotices;Warnings
【摘要】:
【中国标准分类号】:J47
【国际标准分类号】:25_080_40;25_140_10;25_140_99
【页数】:4P;A4
【正文语种】:其他