泰科纳POMM140-L1---M140-L1isageneralpurposeacetalcopolymermaterialwithaslightlylowerviscosityforimprovedflowinmoldingthathasbeenmodifiedtoreduceoreliminatenoise(squeak)whenwearingagainstitself.PhysicalperformanceratingunitsystemtestmethodDensity:1.40g/cm?ISO1183MVR(190°C/2.16kg)12.0cm3/10minISO1133Shrinkage:ISO294-4Verticalflowdirection1.7%ISO294-4Flowdirection1.9%ISO294-4MechanicalpropertiesratingunitsystemtestmethodTensilemodulus2600MPaISO527-2/1A/1Tensilestress(yield)63.0MPaISO527-2/1A/50Tensilestrain(yield)9.5%ISO527-2/1A/50Bendingmodulus(23°C)2500MPaISO178ImpactperformanceratingunitsystemtestmethodNotchedimpactstrengthofsimplysupportedbeam(23°C)6.0kJ/M?ISO179/1eaNotchedimpactstrengthofcantileverbeam(23°C)5.7kJ/M?ISO180/1AThermalperformanceratingunittestmethodHotdeformationtemperature(1.8MPa,UNannealed)100°CISO75-2/AMeltingtemperature1166°CISO11357-3LinearcoefficientofthermalexpansionISO11359-2Flow1.1e-4cm/cm/°CISO11359-2Transverse1.2e-4cm/cm/°CISO11359-2FillinganalysisratingunitsystemtestmethodDensityofmelt1.170g/cm?InternalmethodInjectionratingunitsystemDryingtemperature:80.0to100°CDryingtime:3.0HRThetemperatureatthebackofthebarrelis170to180°CThetemperatureinthemiddleofthebarrelis180to190°CTemperatureatfrontofbarrel180to190°CNozzletemperature190to200°CProcessing(melt)temperature180to200°CMoldtemperature:80.0to120°CInjectionpressure:60.0to120MPaTheinjectionspeedwasslowtomediumHoldingpressure60.0to120MPaBackpressure:0.00to0.500MPa聚甲醛改性研究一直是世界聚甲醛行业研究的***，国外进行聚甲醛改性研究已有四十多年的历史，改性聚甲醛牌号已达一百多种。近年来国内POM的改性研究十分活跃，其改性的方法主要有共混、填充和增强改性。国内的聚甲醛改性研究开始较晚，至今只有云天化等少数生产厂商的十几个牌号的改性聚甲醛产品，改性研究的发展沿着共混和填充两条研究线路进行。)