CELANEX庐 PBTPBT-I-GF15 FR(17)CharacteristicsProcessingInjection MouldingDelivery formPelletsAdditivesLubricantsSpecial characteristicsFlame retardant, Hydrolysis resistantProduct TextCelanex 3216HR is a flame retarded, hydrolysis resistant, 15% fiberglass reinforced polybutylene terephthalate which has an excellent balance of mechanical properties and processability.
ValueUnitTest NormHumidity absorption, 2mm0.2%Sim. to *** 62Water absorption, 2mm0.4%Sim. to *** 62Density1510kg/m鲁*** 1183
Injection
ValueUnitDrying RecommendedyesDrying Temperature120掳CDrying Time, Dehumidified Dryer4hProcessing Moisture Content鈮�0.04%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 temperature185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 min. 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 470-490 (240-255) deg F (deg C) Nozzle Temperature 480-490 (250-255) deg F (deg C) Melt Temperature 460-490 (235-255) 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.
Processing Notes
Pre-Drying
To avoid hydrolytic degradation during processing, CELANEX PBT 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 <-40掳F (-40掳C) at 250掳F (121掳C) for min. 4 hours.
Storage
For subsequent storage of the material in the dryer until processed (<= 60 h) it is necessary to lower the temperature to 100掳 C.
