ProcessingInjection MouldingDelivery formPelletsSpecial characteristicsHydrolysis resistant, High FlowProduct TextCelanex 3309HRHF is a 30% fiberglass reinforced Polybutylene Terephthalate which has excellent hydrolysis resistance, mechanical properties and improved flow.
ValueUnitTest NormMelting temperature, 10掳C/min225掳C*** 11357-1/-3Glass transition temperature, 10掳C/min60掳C*** 11357-1/-3Temperature of deflection under load, 1.8 MPa210掳C*** 75-1/-2Temperature of deflection under load, 0.45 MPa222掳C*** 75-1/-2Coefficient of linear thermal expansion (CLTE), parallel20E-6/K*** 11359-1/-2Coefficient of linear thermal expansion (CLTE), normal100E-6/K*** 11359-1/-2
ValueUnitTest NormHumidity absorption, 2mm0.16%Sim. to *** 62Density1530kg/m鲁*** 1183
Injection
ValueUnitDrying RecommendedyesDrying Temperature120掳CDrying Time, Dehumidified Dryer4hProcessing Moisture Content鈮�0.02%Melt Temperature Optimum250掳CMin. melt temperature240掳CMax. melt temperature260掳CScrew tangential speed0.1 - 0.3m/sMold Temperature Optimum80掳CMin. mould temperature60掳CMax. mould temperature130掳CEjection temperature168掳CAdditional informationInjection molding
Preprocessing
To avoid hydrolytic degradation during processing, CELANEX resins have to be dried to a moisture level equal to or less than 0.02%. Drying should be done in a dehumidifying hopper dryer capable of dewpoints <-30掳F (-34掳C) at 250掳F (121掳C) for 4 hours.
Processing
Rear Temperature 450-470(230-240) deg F (deg C)
Center Temperature 460-480(235-250) deg F (deg C)
Front Temperature 470-500(240-260) deg F (deg C)
Nozzle Temperature 480-500(250-260) deg F (deg C)
Melt Temperature 460-500(235-260) deg F (deg C)
Mold Temperature 150-200(65-93) deg F (deg C)
Back Pressure 0-50 psi Screw Speed Medium Injection Speed Fast
Injection speed, injection pressure and holding pressure have to be optimized to the individual article geometry. To avoid material degradation during processing low back pressure and minimum screw speed have to be used. Overheating of the material has to be avoided, in particular for flame retardant grades. Up to 25% clean and dry regrind may be used.
