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Common Shrinkage Values
Shrinkage
A reduction in size of a plastic
that occurs during a processing when a material goes from molten state to solid upon cooling and
solidification. A certain amount of shrinkage is inevitable in any process that involves cooling
of plastic from elevated temperature.
Note: Shrink rates can vary based on material, processing, part geometry, etc. Shrinkage may vary in the direction of flow versus transverse direction (anisotropic shrinkage). Refer to manufacturer guidelines for resin grade specific value.
Common Shrinkage Values For
Generic Thermoplastics
| MATERIAL | SHRINKAGE (per ASTM D955) |
| (in./in.) | |
| ABS- High Impact | .005 - .007 |
| ABS- Medium Impact | .005 - .008 |
| ABS-High Heat | .004 - .006 |
| ACETAL | .020 - .035 |
| ACRYLIC- General Purpose | .002 - .009 |
| ACRYLIC- High Flow | .002 - .007 |
| ACRYLIC- High Heat | .003 - .010 |
| ACRYLIC- Impact | .004 - .008 |
| NYLON- 6,6 | .010 - .025 |
| NYLON- 6 | .007 - .015 |
| NYLON- Glass Reinforced | .005 - .010 |
| POLYCARBONATE | .005 - .007 |
| POLYESTER .025 - .050 thick | .006 - .0012 |
| POLYESTER .050 - .100 thick | .012 - .017 |
| POLYESTER .100 - .180 thick | .016 - .022 |
| POLYETHERIMIDE | .005 - .007 |
| POLYETHYLENE- LDPE | .015 - .035 |
| POLYETHYLENE- HDPE | .015 - .030 |
| POLYPROPYLENE | .010 - .030 |
| PPOŽ/HIPS (NORYLŽ) | .005 - .007 |
| POLYSTYRENE- Crystal | .002 - .008 |
| POLYSTYRENE- Impact | .003 - .006 |
| POLYURETHANE | .010 - .020 |
| PVC-RIGID | .002 - .004 |
| PVC-FLEXIBLE | .015 - .030 |
| SAN | .002 - .006 |
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