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Polystyrene Processing Guide

PROCESSING CRYSTAL IMPACT IRPS
  Melt Index: 1-5 5-14 15+ 3-7 8-14 15+ 3-6 7-12
Properties

Units

 
Material Drying ° F/hrs

° C/hrs

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

Process Temp.
  • Melt       
° F

° C

440

227

430

221

420

216

440

227

440

227

430

221

450

243

430

221

  • Nozzle
° F

° C

430

221

420

216

410

210

430

221

430

221

420

216

440

238

420

216

  • Front
° F

° C

440

227

430

221

410

210

440

227

440

227

430

221

440

238

430

221

  • Middle
° F

° C

420

216

410

210

400

204

430

221

420

216

400

204

420

216

410

210

  • Rear
° F

° C

370

188

370

188

370

188

370

188

370

188

370

188

380

193

360

182

Mold Tempe-
rature
° F

° C

90-110

32-43

90-110

32-43

90-110

32-43

90-110

32-43

90-110

32-43

90-110

32-43

90-110

32-43

90-110

32-43

Injection Pressure PSI x 10³

MPa

10-12

69-83

9-11

62-76

8-10

55-69

10-12

69-83

9-11

62-76

8-10

55-69

10-12

69-83

9-11

62-76

Injection Speed   Fast Fast Fast Fast Fast Fast Mod-
erate
Mod-
erate
Holding Pressure PSI x 10³ 6-8 5-7 4-6 6-8 5-7 4-6 6-8 5-7
Back Pressure PSI (min) 50 50 50 50 50 50 50 50
Screw Speed RPM (min) 60 60 60 60 60 60 60 60
Cushion Inches

MM

.125

3

.125

3

.125

3

.125

3

.125

3

.125

3

.125

3

.125

3

Cooling Cycle

Wall Thickness

Cycle Time
Inches MM (Seconds)
0.020 0.50 10-13

15-19

20-26

25-33

30-39

35-45

40-52

45-58

50-62

55-69

0.040 1.00
0.060 1.50
0.080 2.00
0.100 2.53
0.120 3.00
0.140 3.50
0.160 4.05
0.180 4.55
0.200 5.06

The above molding guidelines are to be considered as a starting point, and final settings are predicated on
part and tool design and equipment selection.

 


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TECHNICAL TIPS
Ultrasonic Weldability Part 2
Polystyrene Processing Guide
How SPI mold finishes relate to part release
Determining K-Thermal conductivity
Successful Mold Trials by Telephone
Ultrasonic Weldability
Melt Index Test
Estimating Pressure Drop
Barrel Residence Time
List of Purging Materials
Mold Cooling
Product Design
General Unit Conversions
Volume to Weight Conversions
Generic Screw Design for Injection Molding
Basic Polymers: Commodities
Common Shrinkage Values
Plastics by Performance Ability
Guide to Thermoplastics
Typical Start-Up Conditions for Extrusion
Drying of Resin Materials
Venting
Specific Gravity
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