ASTM D7027-2005 用测量划痕机评价高聚物覆层和塑料耐擦伤性的标准试验方法

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【英文标准名称】:StandardTestMethodforEvaluationofScratchResistanceofPolymericCoatingsandPlasticsUsinganInstrumentedScratchMachine
【原文标准名称】:用测量划痕机评价高聚物覆层和塑料耐擦伤性的标准试验方法
【标准号】:ASTMD7027-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:评定;耐擦伤性;高聚物;塑料;划痕;试验;覆层;机器;有机覆层
【英文主题词】:criticalload;polymer;ranking;scratch;scratchhardness;scratchresistance;visibility;whitening
【摘要】:Scratchtestsareperformedonspecimens:(1)toevaluatethescratchormarresistanceofaparticularmaterial,(2)toranktherelativescratchresistanceofdifferentmaterials,or(3)todeterminethescratchingcoefficientoffrictionofmaterials.Sincepolymersexhibitmechanicalpropertiesthatarestronglydependentontemperature,thetestmethodprescribedhereinisdesignedtoyieldreproducibleresultswhenusersperformtestsunderthesimilartestingenvironmentandonspecimensofthesamematerialandsurfacetexturethataresubjectedtothesameconditioningprocedures.Certainpolymersareself-healing(recoverable)whensubjectedtoscratchesandotherphysicaldeformationsbecauseoftheirviscoelasticandrelaxationproperties.Itisimportanttonotethedifferencebetweentheinstantaneous(ifreadilymeasurable)andthepost-scratchdamagesandappropriatelycompareresultstoensurereproducibility.x201C;Whiteningx201D;ofthescratchedsurfaceisakeydamagemechanismthathaspromptedmuchconcerninautomotiveandotherapplicationswheresurfaceaestheticismisimportant.Thistypeofdamageisundesirablebecauseitisevidenttohumaneyes.Thecriticalnormalloadatwhichthisphenomenonappearsservesasabenchmarkinrankingmaterialperformance.Forpolymersthatdonotexhibitwhitening,ascratchgroovefromsevereploughingisstillhighlynoticeable.Insuchcases,thenormalloadrequiredtoachieveacertainscratchwidthshallbereportedtocharacterizescratchvisibilityandscratchresistance.Thecriticalscratchwidthshallbedecidedbyusersinaccordancewiththespecificmaterialandremainsthesamethroughoutasetoftestsforaconsistentcomparison.Thevariationofthescratchwidthasafunctionoftheappliedloadshallalsobeplottedforcomparisonpurposes.1.1Thistestmethoddescribesalaboratoryprocedureusinganinstrumentedscratchmachinetoproduceandquantifysurfacedamageundercontrolledconditions.Thistestmethodisabletocharacterizethemarandscratchresistanceofpolymersbymeasuringmanysignificantmaterialparameters.Thescratch-inducinganddataacquisitionprocessisautomatedtoavoiduser-influencedeffectsthatmayaffecttheresults.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;FLTMBN108-13,ISO1518andISO12137-2arerelatedtothistestmethod;thecontentsaresignificantlydifferentfromthismethod.
【中国标准分类号】:A29
【国际标准分类号】:25_220_60
【页数】:8P.;A4
【正文语种】: