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MoldingGuide f Minlon ® mineralreinforcednylonresin Start with DuPont ResinDescription Minlon®istheDuPonttrademarkforitsengineering thermoplasticresins.ThepresentgradesofMinlon® aremineralandmineral/glassreinforcednylon66 resins.Mineralparticlesandglassfibersarechemi- callybondedwithnylonpolymertoprovidea materialexhibitingtheexcellentchemicalresis- tanceandretentionofpropertiesathightempera- turescharacteristicofnylon,whileenhancing stiffness,strength,andheatresistance. Itisimportanttopointoutthatthesecompositions arereinforced,notfilled,resins,meaningthatthere isachemicalbondbetweenthenylonandthe mineralormineralandglassparticles,thusgreatly enhancingthetensileandstiffnessproperties. Minlon®alsoexhibitsbetterdimensionalstability andcreepresistancethanunreinforcednylonand lowerwarpagethanglassreinforcednylon. MoldingConditions CylinderTemperature Theseproductscanbeprocessedreadilyinconven- tionalmoldingequipment.Typicalmoldingtem- peratureprofilesareshowninTable1. Usehigher-than-typicalrearzonetemperature (300°C[570°F]max.)to: •improvescrewrecoveryrates; •reducewearfromabrasionbetweenun- meltedparticlesandthescrewand/orbarrel; •reducetorqueloadsandstallingduringfast cycles. MeltTemperature Typicalmelttemperaturesforeachresinareshown inTable1.Foroptimumtoughness,usemelt temperaturesinthemiddleofthetypicalrange. Highertemperaturescanbeusedtoimprovethe surfaceappearance. NozzleTemperatures Areversetapernozzleisrecommended.Typical temperaturesarelistedinTable1.Highernozzle temperaturesmaybenecessaryduringstart-upto compensateforcoldmoldsandpreventpremature freeze-off. MoldTemperature Moldtemperaturesinthe65-100°C(150-210°F) rangearenormallyused,althoughtemperatures between100-115°C(210-240°F)aresometimes utilizedtoimprovefilling,surfacefinish,andto reducethicksectionvoids. InjectionRates Surfaceappearanceisaffectedbyinjectionspeed. Afast,one-secondinjectionspeednormallygives thehighestgloss.However,whenasemigloss appearanceisnotrequired,aslowerfillcanbeused topro