Plastic shrinkage rate and mold shrinkage rate For every product design, it is very important to know the shrinkage rate of the plastics. So that when he designs his part design, he can show the right scale size of the drawing to the mold making factory like Jing form. Meanwhile, the mold shrinkage rate provides good information to the production injection molding factory for calculating the finished product size to be stabilized in the final form.
| Plastics Shrinkage Rate |
|
| General Plastics |
Shrinkage Rate (%) |
| Raw Material |
Add. 30% GF |
| LDPE |
2.0 |
0.5 |
| HDPE |
2.0 |
0.4 |
| PP |
1.8 |
0.4 |
| PS |
0.6 |
0.1 |
| PVC |
0.4 |
0.1 |
| PMMA |
0.5 |
0.1 |
| ABS |
0.6 |
0.1 |
| Engineering Plastics |
Shrinkage Rate (%) |
|
| Raw Material |
Add. 30% GF |
| NY6 |
1.5 |
0.4 |
| NY66 |
1.5 |
0.4 |
| PBT |
2.0 |
0.4 |
| POM |
2.5 |
0.5 |
| PC |
0.6 |
0.1 |
| PPO |
0.6 |
0.1 |
| Mold Shrinkage Rate |
|
| Plastics |
Glass Fiber Adding |
Mold Shrinkage Rate |
| [%] |
[%] |
| PS |
|
0.3-0.6 |
| HI-PS |
|
0.5-0.6 |
| SAN |
|
0.5-0.7 |
| ABS |
|
0.4-0.7 |
| ASA |
|
0.4-0.6 |
| LDPE |
|
1.5-5.0 |
| HDPE |
|
1.5-3.0 |
| PP |
|
1.0-2.5 |
| PP+GF |
30 |
0.5-1.2 |
| PVC-soft |
|
>0.5 |
| PVC-rigid |
|
0.5 |
| PVDF |
|
3.0-6.0 |
| PMMA |
|
0.1-0.8 |
| POM |
|
1.9-2.3 |
| PPO |
|
0.5-0.7 |
| PPO+GF |
30 |
<0.7 |
| CA |
|
0.5 |
| PC |
|
0.8 |
| PC+GF |
10~30 |
0.15-0.55 |
| PBT |
|
1.5-2.5 |
| PBT+GF |
30-50 |
0.3-1.2 |
| PA6 |
|
0.5-2.2 |
| PA6+GF |
30~50 |
0.3-1 |
| PA66 |
|
0.5-2.2 |
| PA66+GF |
30~50 |
0.5-1.5 |
| PA11 |
|
0.5-1.5 |
| PA12 |
|
0.5-1.5 |
| PPS |
40 |
0.2 |
