Plastics Shrinkage Rate & Mold Shrinkage Rate

It is very important for each product design to know the plastics shrinkage rate. So that when he designs his parts design, he can present the right scale size of the drawing to mold  manufacturing factory like Intertech.

Meanwhile, the mold shrinkaged rate provides good information for production injection molding factory for calculating the final finished product size to be stablized in final shape.

 
                                    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