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MOLDING TECHNICAL SHEET

GAPEX HPP10 - HPP40

Description : 10% Thru 40% Glass / Mineral Reinforced Polypropylene

Material Pre-dry : Normally it is not necessary to pre-dry this material. However, if conditions dictate drying to optimize material properties and part appearance then dryin a desiccant dryer at 180 F for 2-3 hours or 160 F for > 4 hours.Barrel Temperatures (Range): Rear: 420 - 450 F Middle: 420 - 450 F Front: 430 - 470 F Nozzle: 430 - 470 FManifolds: Maintain manifolds, runners and tips 10 to 20 F above the front zonetemperature to allow easier filling. (Gate drool is best eliminated using screw decompression rather than reducing tip temperature.)Mold Temperature (Range): 100 - 120 F (Core) Cooler temperatures may be needed 110 - 130 F (Cavity) to maintain dimensions or eliminate sinks in thick sections. Back Pressure (Range): 20 - 50 psiInjection Speed : medium to slow > depending on surface appearance Screw Speed: medium Injection Pressure: Adjust to just above a short shot.Injection Time: Adjust to just above a short shot- Weigh parts for consistent packing pressure and part consistency. Cushion (Range): 0.2 - 0.5 in. Nozzle Type: Free flowing / Standard * Some conditions may have to be altered to obtain acceptable parts. Back pressuremust be minimized to retain fiber length and optimize performance. Please do not runtoo cold, molded in stress & rough surface may become a problem. If you must run below melt or temperatures recommended for dimensional precision you may compromise impact and esthetics. Retest parts to confirm performance.