General Processing Tips

Compounds with Fillers
Barrel Temperature Slightly higher than unfilled resin
Mold Temperature Mineral slightly higher than unfilled resin; carbon black higher than mineral filled
Injection Pressure Must be higher than unfilled resin because of higher viscosities
Back Pressure 50-100 psi (0.34-0.69 MPa)
Injection Speed 1-2 in/sec (25-50 mm/sec)
Screw Speed 60-90 rpm

 

Compounds with Fibers
Barrel Temperature Glass fiber slightly higher than particulate; carbon fiber slightly lower than unfilled resin
Mold Temperature Glass fiber higher than particulate; carbon fiber higher than glass or particulate
Injection Pressure Must be higher than unfilled resin because of higher viscosities
Back Pressure 50-100 psi (0.34-0.69 MPa)
Injection Speed Slowest speed without sacrificing appearance
Screw Speed Minimum speed without causing delays in molding cycles