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Material shrinkage rate is the percentage difference between the cooled to room temperature and the size of the workpiece size removed from the mold at a molding temperature. It reflects the degree of cooling after the parts removed from the mold size reduction. Factors affecting shrinkage are: variety of materials, molding conditions, mold structure. Shrinkage of different polymer materials vary. Secondly, the material shrinkage also the complexity of the shape of the internal structure of plastic parts, whether there are inserts and so have a great relationship. There is a need to know more, please pay attention to this site collections.
Commonly used material shrinkage and other parameters are as follows:
Abbreviation | Chinese | Proportion | Shrinkage% | Cylinder temperature | Mold temperature |
LDPE | Low-density polyethylene | 0.92 | 3 | 220~260 | 20~40 |
HDPE | Degree density polyethylene | 0.96 | 3 | 190~280 | 30~70 |
PP | Polypropylene | 0.91 | 2 | 210~280 | 20~50 |
PVC | PVC | 1.38~1.41 | 1.5 | 170~190 | 20~40 |
ABS | Propylene - butadiene - styrene | 1.05 | 0.6 | 210~260 | 50~80 |
AS | Propylene - styrene | 1.07 | 0.6 | 220~270 | 40~80 |
BS | Butadiene - styrene | 1.01 | 0.5 | 190~230 | 30~50 |
GPPS | General Purpose Polystyrene | 1.16 | 0.3~0.6 | 200~250 | 40~60 |
HIPS | High impact polystyrene (benzene) | 1.08 | 0.5 | 210~270 | 20~50 |
EVA | Ethylene - vinyl acetate | 0.95 | 2 | 140~200 | 20~40 |
PMMA | Polymethyl methacrylate methyl ester | 1.18 | 0.6 | 220~240 | 60~80 |
PA6 | Polyamide-6 | 1.13 | 0.7-1 | 250~270 | 40~60 |
PA66 | Polyamide-66 | 1.13 | 1.3 | 280~300 | 40~60 |
PA66+30%GF | Polyamide-66 + 30% glass fiber | 1.39 | 0.3 | 240~270 | 80~90 |
POM | POM | 1.42 | 2.1 | 205~225 | 80~100 |
PC | Polycarbonate | 1.2 | 0.5 | 271~293 | 71~93 |
PET | Polyethylene terephthalate | 1.33 | 0.4 | 277~293 | 15~30 |
PET+30%GF | Polyethylene terephthalate + 30% glass fiber | 1.67 | 0.2 | 265~305 | 95~150 |
PETG | Modified polyester | 1.27 | 0.2~0.5 | 250~270 | 15~40 |
PCTG | Modified polyester | 1.23 | 0.2~0.5 | 275~295 | 15~40 |
PBT | Polybutylene terephthalate fat | 1.4 | 1.5~2.2 | 225~245 | 40~80 |
PBT+30%GF | Polybutylene terephthalate fat | 1.61 | 0.4~0.9 | 225~250 | 40~100 |
PCT+30%GF | Modified polyester + 30% glass fiber | 1.45 | 0.1~0.4 | 295~370 | 105~135 |
CA | Cellulose Acetate | 1.26 | 0.5 | 160~230 | 40~60 |
CAP | Cellulose propionate | 1.2 | 0.5 | 215~240 | 40~75 |
CAB | Cellulose butyrate | 1.19 | 0.5 | 230~250 | 40~85 |
PP high temperature | High temperature polypropylene | 1.12 | 0.9~1.1 | 180~220 | 60~80 |
PP fire | Fire polypropylene | 0.95 | 1.4 | 180~220 | 30~50 |
PPS+40%GF | PPS + 40% glass fiber | 1.67 | 0.25 | 300~340 | 120~150 |
PPO | Polyphenylene ether | 1.07 | 0.5~0.8 | 270~310 | 70~93 |
PSU | Polysulfone | 1.24 | 0.5 | 330~360 | 120~160 |
PES | Polyether sulfone | 1.37 | 0.68 | 340~380 | 120~160 |
LCP | Liquid crystal polymer | 1.7 | 0.02 | 385~400 | 35~200 |
SBS | Styrene block copolymer | 0.96~1.1 | 1.5 | 145~160 | 25~30 |
SEBS | Hydrogenated styrene block copolymer | 0.87~0.91 | 1.6 | 180~220 | 35~65 |
TPU | Thermoplastic polyurethane | 1.24 | 1.2 | 190~220 | 24~49 |
TPV | Fully cured polyolefin elastomer | 0.97 | 1.5~2.5 | 180~190 | 10~80 |
TPEE | Polyester elastomer | 1.2 | 1.4 | 220~250 | 45 |
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