Density and Mold Shrinkage Information

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Density and Mold Shrinkage Information

Introduction:

Mold shrinkage is the shrinkage of the polymer as it cools after the molding process.  It is typically used to properly machine injection molds so that final part dimensions are as desired.  Mold shrinkage can be dependent upon the molding parameters used - often the extremes of the processing range for the material plus a midrange value are tested.

 

Test Procedure:

The length or diameter of the cavity is measured depending on shape of mold.  Test specimens are molded under specified conditions. The parts cool and after 48 hours, the molded parts are measured and the shrinkage is calculated.

PTLI molds for a 5" x 5" x 0.125" plaque (128 x 128 x 3.2mm), a 4" x 0.125" disk (114 x 3.2mm) and an end gated 5" x 0.5" x 0.125" flame bar (128 x 12.7 x 3.2mm) have been measured and can be used for mold shrinkage evaluations.  The molding is done by an approved outside source-

Please see the table below for more details.

Measurement Standard: ASTM  D955, ISO 294, ISO 2577

 

Polymer Molding Shrinkage

Material

Density

Molding Shrinkage (%)

LDPE

0.92~0.93

1.5~5.0%

LLDPE

0.92~0.94

2.0~2.2%

EVA

0.92~0.94

0.7~3.5%

HDPE

0.95~0.97

1.5~4.0%

HDPE-30%GF

1.18~1.28

0.2~0.6%

 

 

 

PP (homopolymer)

0.90~0.92

1~2.5%

PP (copolymer)

0.89~0.91

1~2.5%

PP-10%~40% Talc

0.97~1.27

0.8~2.2%

PP-10%~40%

0.97~1.25

1.7~1.8%

PP-10%~40% Mica

0.99~1.33

0.5~1.5%

PP-10%~30%GF

0.97~1.14

0.2~0.8%

PP-40%GF

1.22~1.23

0.3~0.5%

 

 

 

PS

1.04~1.05

0.4~0.8%

PS-20%GF

1.2

0.1~0.3%

PS-30%GF

1.29

0.1~0.2%

 

 

 

HIPS

1.03~1.06

0.4~0.7%

 

 

 

SAN

1.06~1.08

0.3~0.5%

SAN-20%GF

1.22~1.40

0.1~0.3%

 

 

 

ABS

1.04~1.08

0.4~0.9%

ABS-20%GF

1.18~1.22

0.1~0.2%

ABS-30%GF

1.29

0.2~0.3%

 

 

 

PMMA

1.17~1.20

MD 0.1~0.4% TD 0.2~0.8%

PMMA

1.15

0.3~0.8%

 

 

 

MDX6

 

 

MDX6-20%GF

1.52

0.43%

MDX6-30%GF

1.46

0.51~0.57%

MDX6-40%GF

1.56

0.42~0.49%

MDX6-50%GF

1.65~1.67

0.35~0.47%

MDX6-55%GF

1.7

0.21%

MDX6-60%GF

1.79

0.40%

MDX6-20%CF

1.43

0.15%

MDX6-30%CF

1.35

0.23%

MDX6-20%MR

1.64

0.44%

 

 

 

PC-10%GF

1.27

MD 0.3~0.5% TD 0.4~0.6%

PC-20%GF

1.35

MD 0.1~0.3% TD 0.3~0.5%

PC-30%GF

1.43

MD 0.05~0.25% TD 0.25~0.45%

PC-40%GF

1.52

MD 0.05~0.25% TD 0.2~0.4%

PC-50%GF

 

 

PC-10%CF

1.24

MD 0.1~0.3% TD 0.3~0.5%

PC-20%CF

1.28

MD 0.05~0.2% TD 0.2~0.4%

PC-30%CF

1.31

MD 0.01~0.15% TD 0.2~0.4%

PC-10%CF10%GF

1.31

MD 0.1~0.3% TD 0.2~0.4%

PC-20%CF10%GF

1.35

MD 0.02~0.15% TD 0.15~0.35%

PC-10%PTFE

1.28

0.70%

PC-30%PTFE

1.39

0.90%

 

 

 

PC/ABS

1.25

0.5~0.7%

PC/ABS

1.13

0.4~0.6%

PC/ABS

1.12

0.3~0.5%

PC/ABS-10%GF

1.28

MD 0.2~0.4% TD 0.3~0.5%

PC/ABS-20%GF

1.34

MD 0.1~0.3% TD 0.2~0.4%

PC/ABS-30%GF

1.44

MD 0.05~0.25% TD 0.2~0.4%

PC/PET

1.2~1.26

0.5~1.9%

PC/PBT

1.3

0.5~0.7%

 

 

 

PA6

1.13~1.16

MD 1.0%~1.8% TD 1.3~2.2%

PA6-10%GF

1.2

MD 0.4% TD 1.3%

PA6-15%GF

1.23

MD 0.4% TD 1.3%

PA6-20%GF

1.27

MD 0.3% TD 1.2%

PA6-30%GF

1.36

MD 0.3% TD 1.0%

PA6-33%GF

1.38

MD 0.3% TD 1.0%

PA6-35%GF

1.41

MD 0.3% TD 1.0%

PA6-40%GF

1.49

MD 0.2% TD 0.8 %

Toughed PA6

1.02~1.07

MD 1.5% TD 2.2%

 

 

 

PA66

1.13~1.15

0.7~1.8%

PA66-15%GF

1.21~1.23

0.5~0.9%

PA66-30~33%GF

1.25~1.40

0.2~0.6%

PA66-50%GF

1.56

0.2~0.7%

PA66-30%GF

1.3~1.31

0.30%

PA66-40%GF

1.36~1.38

0.20%

PA66-10%PTFE

1.2

1.00%

PA66-30%PTFE

1.34

0.70%

 

 

 

PA46

1.18

1.8~2.0%

PA46-15%GF

1.3

0.5~0.9%

PA46-30%GF

1.41

0.4~0.6%

PA46-50%GF

1.62

0.2~0.4%

 

 

 

PPA-33%GF

1.48

MD 0.2~0.4% TD 0.4~0.8%

PPA-45%GF

1.59

MD 0.2% TD 0.6%

PPA-30%MD

1.45

MD 1.1% TD 1.1%

PPA-45% MD

1.53

MD 1.0% TD 1.0%

PPA-65% MD

1.9

MD 0.3% TD 0.5%

 

 

 

PA11

1.03~1.05

1.20%

PA22

1.01~1.02

0.3~1.5%

 

 

 

PA610

1.08~1.1

0.5~1.5%

PA612

1.06~1.1

1.10%

PA612-30%GF

1.30~1.38

0.2~0.5%

PA612-10%PTFE

1.13

1.20%

 

 

 

PPA

1.17

1.5%~2.0%

PPA-15%GF

1.26

0.5~0.7%

PPA-33%GF

1.43

0.2~0.5%

PPA-45%GF

1.56

0.2~0.3%

 

 

 

POM (homopolymer)

1.42

1.8~2.5%

POM (copolymer)

1.4

2.0~2.2%

POM-10%GB

1.47

MD 1.9% TD 1.6%

POM-25%GB

1.58

MD 1.8% TD 1.5%

POM-10%GF

1.46

1.10%

POM-25%GF

1.59

MD 0.4% TD 1.2%

POM-10%MF

1.49

1.70%

POM-20%MF

1.55~1.59

0.90%

POM-20%CF

1.46

0.40%

POM-10%PTFE

1.46

2.00%

POM-20%PTFE

1.51

2.0~2.5%

IM POM

1.29~1.35

1.2~1.7%

 

 

 

mPPE

1.06~1.10

0.5~0.7%

mPPE-10%GF

1.15~1.17

MD 0.2~0.4% TD 0.3~0.5%

mPPE-15%GF

1.19~1.21

MD 0.2~0.4% TD 0.3~0.5%

mPPE-20%GF

1.22~1.24

MD 0.1~0.3% TD 0.2~0.4%

mPPE-30%GF

`1.31~1.33

MD 0.1~0.2% TD 0.2~0.4%

mPPE-25%GF 15%Filler

1.42

MD 0.5~0.25% TD 0.1~0.3%

mPPE-5%PTFE

1.11

0.5~0.7%

mPPE -10%PTFE

1.12

0.5~0.7%

mPPE-15%PTFE

1.15

0.5~0.7%

 

 

 

PPE/PA6 alloy

1.1

MD 1.2~1.4% TD 1.1~1.3%

PPE/PA6-20%GF

1.26

MD 0.3~0.5% TD 0.4~0.6%

PPE/PA66 alloy

1.10~1.13

MD 1.1~1.3% TD 1.1~1.3%

 

 

 

PET

1.29~1.40

0.2~3.0%

PET-15%GF

1.33

0.1~0.4%

PET-30%GF

1.55~1.70

0.2~0.9%

PET-45%GF

1.58~1.74

0.2~0.9%

PETG

1.27

0.2~0.5%

PCTG

1.23

0.2~0.5%

 

 

 

PBT

1.3~1.43

1.2~2.5%

PBT (UL-HB)

1.26~1.31

(3mm) MD 2.2~2.3% TD 2.0~2.1%

PBT (UL-HB)

1.26~1.31

(1mm) MD 1.5~1.6% TD 1.4~1.5%

PBT (UL-V2-V0)

1.42

(3mm) MD 2.2~2.4% TD 2.0%

PBT (UL-V2-V0)

1.42

(1mm) MD 1.4% TD 1.4%

PBT-15%GF

1.41

(3mm)MD 0.4~0.7% TD 1.3~1.5%

PBT-15%GF

1.41

(1mm) MD 0.5% TD 1.0%

PBT-20%GF

1.48

0.4~1.4%

PBT-30%GF

1.52

(3mm) MD 0.2~0.3% TD 0.5~1.3%

PBT-30%GF

1.52

(1mm) MD 0.1~0.3% TD 0.4~0.8%

PBT-45%GF

1.67

(3mm) MD 0.2% TD 0.9%

PBT-45%GF

1.67

(1mm) MD 0.1% TD 0.6%

 

 

 

PPS

1.31~1.35

MD 1.1~1.6% TD 1.6~1.8%

PPS-30%GF

1.57

MD 0.3~0.4% TD 0.6~0.7%

PPS-40%GF

1.68

MD 0.3% TD 0.5~0.7%

PPS-50%GF

1.75

MD 0.4% TD 0.6%

PPS-65%GF/MF

1.91~1.98

MD 0.2~0.3% TD 0.4~0.6%

PPS-30%CF

1.44

MD 0.1% TD 0.6%

 

 

 

LCP

1.35~1.84

0.1~0.6%

LCP-15%GF

1.5

MD 0.1% TD 0.4%

LCP-30%GF

1.62

MD 0.2% TD 0.4%

LCP-30%GF

1.62

MD 0~0.2% TD 0.1~0.78%

LCP-50%GF

1.79

MD 0.2% TD 0.4%

LCP-30%GF

1.49

MD 0.1% TD 0.3%

 

 

 

PAI

1.42

0.6~0.85%

PAI-30%GF

1.61

0.1~0.25%

 

 

 

PEI

1.27

0.5~0.7%

 

 

 

PSF

1.23

0.6~0.7%

PSF-25%MD

1.48

MD 0.5% TD 0.5%

PSF-40%MD

1.61

MD 0.5% TD 0.8%

PSF-10%GF

1.41

MD 0.4% TD 0.5%

PSF-20%GF

1.47

MD 0.3% TD 0.5%

PSF-30%GF

1.52

MD 0.2% TD 0.6%

PSF-40%GF

1.66

MD 0.2% TD 0.6%

 

 

 

PES

1.37

0.6~0.7%

PES-10%GF

1.45

0.5~0.6%

PES-20%GF

1.51

0.4~0.6%

PES-30%GF

1.53~1.60

0.4~0.6%

 

 

 

PPSF

1.29~1.37

0.5~0.8%

 

 

 

PI

1.33~1.43

0.80%

PI-30%GF

1.56

0.40%

PI-30%CF

1.43

0.20%

 

 

 

TPU (Shore A 72)

1.04

0.8~1.2%

TPU (Shore A 92)

1.09

0.6~1.0%

TPU (Shore D 67)

1.11

0.4~0.6%

TPU-20%GF

1.22~1.36

0.4~1.0%

TPU-30%LGF

1.43

0.2~0.6%

TPU-40%LGF

1.52

0.1~0.5%

TPU-60%LGF

1.76

0.1~0.3%

TPU-20%

1.24~1.32

0.4~1.2%

TPU-40%

1.48~1.55

0.4~1.2%

 

 

 

PVC

1.65~1.70

0.5~2.5%

Silicon

1.08~1.14

0~0.5%

TPO

0.95~1.0

0.8~1.0%

TPV

0.94~1.05

1.5~2.5%