https://www.avient.com/sites/default/files/2020-12/therma-tech-processing-guide.pdf
Injection Molding Parameters
Base Resin PPA PPS PA 6/6 PA 12
Barrel Temperatures °F (°C)*
Rear Zone 550–580(288–305)
550–580
(288–305)
440–490
(227–254)
440–480
(227–250)
Center Zone 560–600 (293–316)
560–615
(293–324)
470–510
(243–266)
460–510
(238–266)
Front Zone 580–620 (304–327)
590–630
(310–333)
490–540
(254–282)
480–520
(250–271)
Nozzle 575–615 (302 –324)
600–625
(316–330)
520–570
(271–300)
500–530
(260–277)
Melt Temperature °F (°C) 575–615(302–324)
600–625
(316–330)
520–570
(271–300)
500–530
(260–277)
Mold Temperature °F (°C) 250–300 (121–150)
250–300
(121–150)
150–200
(66–93)
150–200
(66–93)
Pack and Hold Pressure 50–80% of Injection Pressure
Injection Velocity 1.0–3.0 in/sec
Back Pressure 25–100 psi
Screw Speed 25–75 rpm
Drying Parameters °F (°C) 6 hours @ 175 (80) 6 hours @ 300 (150) 3 hours @ 180 (82) 3 hours @ 180 (82)
Cushion 0.125–0.250 in
Screw Compression Ratio 2.5:1–3.5:1 2.0:1–2.5:1 2.5:1–3.5:1 2.5:1–3.5:1
Nozzle Type General Purpose General Purpose Reverse Taper Reverse Taper
Clamp Pressure 4–5 tons/in2 of projected area of cavities and runner system
* Barrel temperatures should be elevated for compounds designed for electrical insulative properties.