Injection Molding General Processing Guidelines

Materials Shrinkage .125 in. wall Specific Gravity Drying Time Drying Temp F Mold  Temp Melt Temp
ABS .005-.009 1.05 2-4 hrs. 180-200 100-180 390-540
ABS-PA .010-.012 1.06 2-3 hrs. 175-190 70-200 460-530
ABS-PC .006-.009 1.13 3-4 hrs. 175-230 140-210 486-562
ABS-TPU .005-.010 1.12 4 hrs. 170 80-180 370-420
Acetal* .018-.025 1.42 1-4 hrs. 160-185 180-220 380-430
Acrylic .002-.008 1.19 2-3 hrs. 165-200 150-200 420-510
ASA .004-.008 1.05 2 hrs. 180-190 100-180 486-552
ASA+AES .004-.008 1.05 2 hrs. 180-190 100-180 486-552
GPPS* .003-.005 1.05 2 hrs. 150 70-120 400-480
EVA* .002-.005 .937-.964 2-4 hrs 140 60-110 350-450
PE* .015-.050 .88-.965 1-2 hrs 120-150 60-110 360-525
HIPS* .005-.008 1.05 1-2 hrs. 150-170 60-180 400-475
IONOMER .002-.006 .957-.967 8 hrs 140 60-100 400-500
LCP .000-.008 1.5-1.81 2-4 hrs. 275-300 85-280 660-710
Nylon 6 .015-.025 1.13 2-4 hrs. 180 160-220 460-550
Nylon 66 .015-.022 1,14 2-4 hrs. 175 160-240 520-580
Nylon 4/6 .004-.030 1.17-1.70 2-4 hrs. 250 180-300 580-590
Nylon 6/10 .003-.016 1.07-1.63 2-4 hrs. 180 165-220 480-530
Nylon 6/12 .001-.020 1.03-1.46 2-4 hrs. 180-200 165-220 450-580
PBT .001-.023 1.31-1.72 2-4 hrs 200-250 150-250 450-490
PET .001-.023 1.28-1.84 3-4 hrs 250-275 190-250 520-590
PC .005-.008 1.2 4 hrs. 250 150-225 520-610
PC+PET .006-.008 1.22 4-8 hrs. 210-250 65-200 530-560
PEEK .0005-.007 1.37-1.70 2-16 hrs. 300-350 250-400 700-750
PEI .0005-.002 1.27-1.61 2-15 hrs. 300 275-325 670-710
PES .001-.005 1.37-1.70 2-16 hrs. 300 280-325 650-750
TPE .008-.050 .875-1.34 2-4 hrs. 170-230 60-175 350-500
TPO* .009-.018 .83-1.15 1-2 hrs. 120-180 60-150 350-500
PP-HP* .012-.024 0.9 1-2 hrs. 120-150 70-120 400-500
PP-CP* .012-.024 0.9 1-2 hrs. 120-150 70-120 375-525
PPO .005-.008 1.04-1.06 2-4 hrs. 170-230 150-220 520-600
PPS .001-.012 1.4-2.0 2-4 hrs. 300-350 275-325 600-650
PSU .0005-.008 1.38-1.57 4-16 hrs. 275-325 250-325 650-750
TPUR .001-.006 1.19-1.70 4-12 hrs. 180-280 150-250 420-530
TPU .006-.020 1.04-1.30 2-4 hrs. 180-230 60-140 380-440
PVC (RIGID)* .002-.006 1.23-1.54 2 hrs. 140-180 70-100 350-410
PVC (FLEX)* .010-.025 1.13-1.72 2 hrs. 120-150 60-120 320-390
SAN .001-.007 1.07 2-3 hrs. 180-200 100-200 425-500
SB* .002-.010 1.01 1-2 hrs. 140-160 80-120 380-450
SMA .002-.007 1.07 2 hrs. 180-200 120-180 470-550
Note: Check manufacturers’ recommendations for specific processing parameters. • Denotes materials that typically do not require pre-drying.