旭化成POM3510---Itisduetothedifferentstructurethatleadstothedifferenceofhomopolymerandcopolyformaldehydeinvariousproperties.Themaindifferencesbetweenthetwoare:homoformaldehydehashigherdensityandcrystallinity,meltingpointandHDTare10℃higherthanthatofcopolyformaldehyde,andthestrength,creepresistanceandfrictionresistancearebetter,butthethermalstabilityispoor,theprocessingtemperaturerangeisabout10℃,andtheacid-basestabilityislow.Thedensity,crystallinity,meltingpointandstrengthofcopolyformaldehydearelow,butthethermalstabilityisrelativelygood,anditisnoteasytodecompose.Theprocessingtemperaturerangeis30~50℃,andtheacid-basestabilityisgood3510physicalpropertiestableBasicperformance-ratingunit-TestMethodMeltflowrate2.8g/10minASTMD1238(190℃/2.16kg)2.8g/10minISO1133Waterabsorption(24hr)0.2%ASTMD570Physicalperformance-Rating-unit-TestMethodSpecificgravity1.41g/cmASTMD792,ISO1183Shrinkageofforming(Flow)1.6-2%ASTMD955,ISO294-4(AcrossFlow)1.6-2%ISO294-4M-scale78ASTMd785Mechanicalproperties-Rating-unit-TestMethodTensilemodulus2650MPaISO527-2Yieldtensilestress63MPaISO527-2Tensilestress61MPaASTMD638elongationatbreak75%ASTMD63860%ISO527-2Bendingmodulus2600MPaASTMD790Bendingstrength88MPaASTMD790Talbotwearresistance(1000cycles)14mgASTMd1044CharpyNotchImpactStrength(23℃)9kj/mISO179/1eaIzodnotchimpactstrength78j/mASTMD256Thermalperformance-Rating-unit-TestMethodThermaldeformationtemperature(0.45MPa,unannealed)158℃ASTMD648(0.45MPa,unannealed)156℃ISO75-2/B(1.8MPa,unannealed)110℃ASTMD648(1.8MPa,unannealed)95℃ISO75-2/ALinearthermalexpansioncoefficientofflowdirection0.0001cm/cm/℃ASTMe831FlameretardantgradeHBUL94)