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Common plastic material processing temperature, specific gravity and shrinkage table
datetime:2015-03-27   Hits:2092

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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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