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Venting
Venting - Shallow
channel in a mold which allows air, gas, or volatile to exit as the melt enters the cavity. Adequate
venting is important to insure complete evacuation of melt gases and entrapped cavity air. Techniques
commonly used are "Conventional Parting Line Vent" and "Continuous Venting".
Common Venting Dimension For Thermoplastics
| MATERIAL | VENT DEPTH (in.) | LAND (in.) |
| ABS, SAN | .002 - .003 | .030 - .050 |
| ACETAL | .0005 - .0015 | .040 - .050 |
| ACRYLIC | .015 - .003 | .040 - .050 |
| NYLON | .0005 - .001 | .020 - .040 |
| NYLON-FILLED | .0005 - .0025 | .030 - .050 |
| POLYCARBONATE | .001 - .003 | .030 - ..050 |
| POLYESTER | .0005 - .0015 | .030 - .050 |
| POLYESTER-FILLED | .0005 - .002 | .030 - .040 |
| POLYETHYLENE | .001 - .002 | .020 - .040 |
| POLYPROPYLENE | .001 - .002 | .020 - .040 |
| PPOŽ | .001 - .002 | .030 - .050 |
| PPS | .0005 - .001 | .030 - .050 |
| POLYSTYRENE | .001 - .003 | .030 - .050 |
| PVC-RIGID | .001 - .003 | .040 - .050 |
| PVC-FLEXIBLE | .0005 - .002 | .030 - .050 |
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