Polymer Partner
Menú Principal:
- Sociedad
- Termoplàsticos
- Elastomeros
- Aditivos
- Proceso
- Polypedia
- Contactos
- Forum
Shrinkage
Polypedia > Analisi di laboratorio > Fisiche
Shrinkage
Shrinkage is the ratio of the volume of the plastic in the melt to the volume of the plastic in its final useable state. When applied to molding, it is expressed as the ratio of the dimension of the mold to the dimension of the part that is molded. Shrinkage is expressed in inches per inches or in percentage.
In case of crystalline materials, shrinkage is not the same in the cross flow and the parallel flow direction. Such materials are called anisotropic materials.
In case of amorphous materials, shrinkage is the same in the cross flow and the parallel flow direction. Such materials are called isotropic materials.
| Material Name | Shinkage % | Material Name | Shinkage % |
| ABS | 0.4 – 0.7 | PES | 0.6 – 0.8 |
| CA | 0.3 – 0.7 | PET | 1.8 – 2.1 |
| CAB | 0.2 – 0.5 | PMMA | 0.2 – 1.0 |
| CP | 0.2 – 0.5 | POM | 2.0 – 3.5 |
| EVA | 0.7 – 2.0 | PP | 1.0 – 3.0 |
| FEP | 3.0 – 6.0 | PPO | 0.5 – 0.7 |
| GPPS | 0.2 – 0.8 | PSU | 0.6 – 0.8 |
| HDPE | 1.5 – 4.0 | PTFE | 5.0 – 0.9 |
| HIPS | 0.2 – 0.8 | PVDF | 2.0 – 3.0 |
| LDPE | 1.5 – 4.0 | SAN | 0.2 – 0.6 |
| PA6 | 1.0 – 1.5 | PP/EPDM | 1.0 – 2.0 |
| PA66 | 1.0 – 2.0 | PUR/TRU | 0.5 – 2.0 |
| PBT | 1.5- 2.0 | SBS | 0.4 – 1.0 |
| PC | 0.6 – 0.8 | SEBS | 1.0 – 5.5 |
| MF | 0.6 – 1.0 | DMC | 0.5 – 0.2 |