ASTM D1238-2004 熔融指数测试方法

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1、Designation:D1238–04StandardTestMethodforMeltFlowRatesofThermoplasticsbyExtrusion1PlastometerThisstandardisissuedunderthe®xeddesignationD1238;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearof

2、lastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*DeterminethePrecisionofaTestMethod1.1Thistestmethodcoversmeasurementoftherateof2.2ANSIStandard:B

3、46.1onSurfaceTexture3extrusionofmoltenresinsthroughadieofaspeci®edlengthanddiameterunderprescribedconditionsoftemperature,load,2.3ISOStandard:andpistonpositioninthebarrelasthetimedmeasurementisISO1133-1991DeterminationoftheMelt-MassFlowRatebeingmade.(

4、MFR)andtheMeltVolume-FlowRate(MVR)ofTher-moplastics31.2ProcedureAisamanualcutoffoperationbasedontimeusedformaterialshaving¯owratesthatfallgenerallybetween3.Terminology0.15and50g/10min.ProcedureBisanautomaticallytimed¯owratemeasurementusedformaterialsh

5、aving¯owsfrom3.1General:0.50to900g/10min.Bybothprocedures,thepistontravelis3.1.1Forde®nitionofsomeofthetechnicaltermsusedingenerallythesameduringthetimedmeasurement;thepistonthistestmethodrefertoTerminologyD883.footisabout46and20.6mmabovethedie.Compar

6、able¯ow4.Signi®canceandUserateshavebeenobtainedbytheseproceduresininterlaboratory4.1Thistestmethodisparticularlyusefulforqualitycontrolround-robinmeasurementsofseveralmaterialsdescribedintestsonthermoplastics.13.1.Provisionismadeforcalculationofmeltvo

7、lume-¯owrateaswellasmeltmass-¯owrate.NOTE3ÐPolymershaving¯owrateslessthan0.15orgreaterthan900g/10minmaybetestedbytheproceduresinthistestmethod;however,NOTE1ÐRound-robintestingindicatesthistestmethodmaybesuit-precisiondatahavenotbeendeveloped.ableat¯ow

8、ratesupto1500g/10minifthetimingclockresolvestheelapsedtimetothenearest0.01s.4.2ThistestmethodservestoindicatetheuniformityoftheNOTE2ÐThistestmethodandISO1133-1991aretechnicallyequiva-¯owrateofthepolymerasmadebyanindividualprocessand,lent.inthi