Typical Shrinkage Information
Reference guide for typical shrinkage values of plastic resins
The information presented on this data sheet was acquired from various sources, including material producers and recognized testing agencies. PSC makes substantial efforts to assure the accuracy of this data. However, PSC assumes no responsibility for the data values and urges that upon final material selection, data points are validated with the manufacturer.
| Material | Shrink (in/in) |
|---|---|
| ABS High Impact | 0.005-0.007 |
| ABS High Heat | 0.004-0.005 |
| ABS Med Impact | 0.005 |
| Acetal | 0.005 |
| Acrylic Gen Purpose | 0.020-0.035 |
| Acrylic High Heat | 0.003-0.010 |
| Acrylic High Impact | 0.004-0.008 |
| Nylon 6/6 | 0.010-0.025 |
| Nylon 6 | 0.07-0.015 |
| Nylon 6/10 | 0.010-0.025 |
| Nylon 12 | 0.08-0.020 |
| Polycarbonate | 0.005-0.007 |
| PET - Amorphous | 0.003-0.005 |
| PBT | 0.010-0.020 |
| PBT 30% Glass Filled | 0.001-0.002 |
| Polyetherimide | 0.005-0.007 |
| Polyethylene Low Density | 0.015-0.035 |
| Polyethylene High Density | 0.015-0.030 |
| PPO | 0.005-0.007 |
| Polypropylene | 0.010-0.030 |
| Polystyrene Gen Purpose | 0.002-0.008 |
| Polystyrene High Heat | 0.002-0.008 |
| Polystyrene High Impact | 0.003-0.006 |
| PVC Rigid | 0.002-0.004 |
| PVC Semi-Rigid | 0.008-0.025 |
| PVC Flexible | 0.002-0.006 |
| SAN | 0.002-0.006 |
Understanding Shrinkage
Shrinkage values represent the dimensional change that occurs as molded parts cool from processing temperature to room temperature. These values are critical for proper mold design and ensuring accurate part dimensions.
Factors affecting shrinkage include material type, processing conditions, part geometry, and cooling time. Always validate shrinkage values with your specific material supplier for critical applications.
Questions About Material Shrinkage?
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