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