收缩率系指塑料制品冷却固化经脱模成形后，其尺寸与原模具尺寸间之误差百分比，可依ASTM D955方法测得。在塑料模具设计时，须先考虑收缩率，以免造成成品尺寸的误差，导致成品不良。以下列举几项常用塑料原料之收缩率比较。
热塑性塑料
塑料名称成形收缩率(％)塑料名称成形收缩率(％)ABS0.3~0.8PBT1.3~2.4AS0.2~0.7PC0.4~0.7CA0.3~0.8PCTFE0.2~2.5CAB0.4~0.5PE0.5~2.5CAP1PET2.0~2.5CP0.4~0.5PES0.5~1.0EC0.4~0.5PMMA0.2~0.8EPS0.4POM0.8~3.5FEP3.0~4.0PP1.0~2.5FRP0.1~0.4PPO0.5~0.7EVA0.5~1.5PPS0.6~1.4HDPE1.2~2.2PS0.2~1.0HIPS0.2~1.0PVA0.5~1.5LCP0.1~1.0PVAC0.5~1.5LDPE1.5~3.0PVB0.5~1.5PA0.6~2.5硬质PVC0.1~0.5PA-60.5~2.2软质PVC1.0~5.0PA-660.5~2.5PVCA1.0~5.0PA-6101.2PVDC0.5~2.5PA-6121.1PVFM0.5~1.5PA-111.2SAN0.2~0.6PA-120.3~1.5SB0.2~1.0PAR0.8~1.0
热固性塑料
塑料名称成形收缩率(％)塑料名称成形收缩率(％)EP0.1~0.5SP0.0~0.5MF0.5~1.5UF0.6~1.4PDAP0.1~0.5UP0.1~1.2PF0.4~0.9DAP0.1~0.5PU0.6~0.8BMC0.0~0.2 
塑机样本 
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