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China Gwell Machinery Co., Ltd.

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Processing temperature, specific gravity and shrinkage of common plastic materials

Author: ComeFrom: Date:2019/9/5 13:12:25 Hits:865
Material shrinkage refers to the percentage of the difference between the size of the product at the molding temperature and the size after it is taken out of the mold and cooled to room temperature. It reflects the degree of shrinkage of the part after cooling out of the mold. The factors that affect the shrinkage rate are: material variety, molding conditions, mold structure, etc. Different polymer materials have different shrinkage rates. Secondly, the shrinkage of the material has a lot to do with the shape of the plastic part, the complexity of the internal structure, and the presence of inserts.
        
Common materials shrinkage and other parameters are as follows:
    

简称中文比重收缩率%料筒温度模温
LDPE低密度聚乙烯0.923220~26020~40
HDPE度密度聚乙烯0.963190~28030~70
PP聚丙烯0.912210~28020~50
PVC聚氯乙烯1.38~1.411.5170~19020~40
ABS丙烯-丁二烯-苯乙烯1.050.6210~26050~80
AS丙烯-苯乙烯1.070.6220~27040~80
BS丁二烯-苯乙烯1.010.5190~23030~50
GPPS通用聚苯乙烯1.160.3~0.6200~25040~60
HIPS高冲击聚苯乙烯(改苯)1.080.5210~27020~50
EVA乙烯-醋酸乙烯脂0.952140~20020~40
PMMA聚甲基丙烯甲脂1.180.6220~24060~80
PA6聚酰胺-61.130.7-1250~27040~60
PA66聚酰胺-661.131.3280~30040~60
PA66+30%GF聚酰胺-66+30%玻纤1.390.3240~27080~90
POM聚甲醛1.422.1205~22580~100
PC聚碳酸脂1.20.5271~29371~93
PET聚对苯二甲酸乙二醇脂1.330.4277~29315~30
PET+30%GF聚对苯二甲酸乙二醇脂+30%玻纤1.670.2265~30595~150
PETG改性聚酯1.270.2~0.5250~27015~40
PCTG改性聚酯1.230.2~0.5275~29515~40
PBT聚对苯二甲酸丁二醇脂1.41.5~2.2225~24540~80
PBT+30%GF聚对苯二甲酸丁二醇脂1.610.4~0.9225~25040~100
PCT+30%GF改性聚酯+30%玻纤1.450.1~0.4295~370105~135
CA醋酸纤维素1.260.5160~23040~60
CAP丙酸纤维素1.20.5215~24040~75
CAB丁酸纤维素1.190.5230~25040~85
PP耐高温耐高温聚丙烯1.120.9~1.1180~22060~80
PP防火防火聚丙烯0.951.4180~22030~50
PPS+40%GF聚苯硫醚+40%玻纤1.670.25300~340120~150
PPO聚苯醚1.070.5~0.8270~31070~93
PSU聚砜1.240.5330~360120~160
PES聚醚砜1.370.68340~380120~160
LCP液晶聚合物1.70.02385~40035~200
SBS苯乙烯嵌段共聚物0.96~1.11.5145~16025~30
SEBS氢化苯乙烯嵌段共聚物0.87~0.911.6180~22035~65
TPU热塑性聚氨脂1.241.2190~22024~49
TPV完全硫化聚烯烃弹性体0.971.5~2.5180~19010~80
TPEE聚酯弹性体1.21.4220~25045
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