| En

प्लास्टिक मशीन समाधान

एसपीसी शंक्वाकार जुड़वां पेंच उत्पादन लाइन

Processing Temperature, specific gravity and shrinkage rate of Common Plastic materials

विचारों:12 समय प्रकाशित करें: 2021-06-08 : Alfred

Processing Temperature, specific gravity and shrinkage rate of Common Plastic materials

Material shrinkage is a reduction in the volume of a material occurs when plasticizing plate cooling after moulding, it is a reduction of the dimensions of cooling plasticizing part, compared with its mould dimensions.

Material shrinkage is the contraction of a plasticizing plate as it cools after mould. It always occurs after ejection, as the part continues to cool. After that, the plate may continue to shrink very slightly for several hours or even days until the temperature and moisture content stabilize.

All polymers have different shrinkage rates depending on many factors. These include material category, moulding condition, mould structures, plate shape, plate interior structure, complexity, inserts etc. 

Our chart below shows typical shrinkage ratios for the list of common materials:

 

Abbreviation

Full title

Specific

gravity

Shrinkage

rate

Temperature of processing

Temperature

of mould

LDPE

Low density polyethylene

0.92

3

220~260

20~40

HDPE

High density polyethylene

0.96

3

190~280

30~70

PP

Polypropylene

0.91

2

210~280

20~50

PVC

Polyvinyl chloride

1.38~1.41

1.5

170~190

20~40

ABS

Polyacrylonitrile Polybutadiene Polystyrene

1.05

0.6

210~260

50~80

AS

Polyacrylonitrile Polystyrene

1.07

0.6

220~270

40~80

BS

Polybutadiene Polystyrene

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

1.08

0.5

210~270

20~50

EVA

ethylene-vinyl acetate copolymer

0.95

2

140~200

20~40

PMMA

polymethyl methacrylate

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 fibre

1.39

0.3

240~270

80~90

POM

polyformaldehyde

1.42

2.1

205~225

80~100

PC

Polycarbonate

1.2

0.5

271~293

71~93

PET

Polyethylene glycol terephthalate

1.33

0.4

277~293

15~30

PET+30%GF

Polyethylene glycol terephthalate

+30% glass fibre

1.67

0.2

265~305

95~150

PETG

Polyethylene terephthalate glycol

1.27

0.2~0.5

250~270

15~40

PCTG

Poly Cyclohexylene Terephthalate Glycol

1.23

0.2~0.5

275~295

15~40

PBT

polybutylene terephthalate

1.4

1.5~2.2

225~245

40~80

PBT+30%GF

polybutylene terephthalate +30% glass fibre

1.61

0.4~0.9

225~250

40~100

PCT+30%GF

Polycarbonateterephthalate +30% glass fibre

1.45

0.1~0.4

295~370

105~135

CA

cellulose acetate fibre

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

Heat-resisting PP

Heat-resisting polypropylene

1.12

0.9~1.1

180~220

60~80

Fire retardant PP

Fire retardant polypropylene

0.95

1.4

180~220

30~50

PPS+40%GF

Polyphenylene sulfide

+40% glass fibre

1.67

0.25

300~340

120~150

PPO


polyphenylene ether

1.07

0.5~0.8

270~310

70~93

PSU


Polysulfone plastics

1.24

0.5

330~360

120~160

PES


Polyethersulfone resin

1.37

0.68

340~380

120~160

LCP

Liquid Crystal Polymer

1.7

0.02

385~400

35~200

SBS

Styrene-butadiene-styrene block copolymer

0.96~1.1

1.5

145~160

25~30

SEBS

Styrene Ethylene Butylene Styrene

0.87~0.91

1.6

180~220

35~65

TPU

Thermoplastic polyurethanes

1.24

1.2

190~220

24~49

TPV

Thermoplastic Vulcanizate

0.97

1.5~2.5

180~190

10~80

TPEE

Thermoplastic elastomers

1.2

1.4

220~250

45

 

This information should only be used as a quick reference.
Users should always refer to the processing data sheets provided by the material supplier.  Differential shrinkages are not considered. Your use of this data is entirely at your own risk and BOYU accepts no liability of any kind.