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Properties

Unit

ASTM test

PTFE

PFA

FEP

ETFE

CTFE

PVDF

PVC

PE

PI

PEEK

Physical Properties

Specific gravity

-

D792

2.14-2.20

2.12-2.17

2.12-2.17

1.7

2.1-2.2

1.77

1.35-1.45

0.91-0.93

1.41

1.3

Melting point

°C

-

327

310

275

270

220

166

75-105

130-137

-

334

Coefficient of liner thermal expansion

10-5/ °C

D696

9.9 (23~66 °C)

12 (21~100 °C)

8.3-10.5

9

4.5-7

8.5

7.5

16-18

5.2

4.8

Thermal conductivity

10-6W/m CCDk

C177

1.9

1.9

1.9

1.8

1.6

1.7

1-2.3

2.6

-

1.9

Index of refraction

-

D541

1.35

1.35

1.34

1.4

-

1.42

1.54

1.51

-

-

Coefficient of water absorption

% (24h)

D570

<0.01

0.03

<0.01

0.03

-

0.05

0.07-4

<0.015

0.39

0.14

Max. temp.

°C

-

260

260

205

180

180

135

50-70

100

260

250

Physical Properties

Tensile strength

Mpa

D638

13.7-34.3

27.5-29.4

18.6

44.6

31-41

37-51

34-61

10-13

83

97

Elongation

%

D638

200-400

300

250-330

100-400

80-250

25-500

2-40

200-575

8

80

Compressive strength

Mpa

D695

11.8

-

15.2

49

31-51

59-68

54-89

-

122

120

Bending strength

Mpa

D790

-

-

-

38

51-64

59-75.5

68-103

-

127

138.3

Flexural modulus

X103Mpa (22.8 °C)

D790

0.55 (5.6)

0.82 (8.4)

0.6

1.37

1.54

1.37

2-3.5

0.25-0.5

3

3.8

Hardness

Rockwell

D785

-

-

-

R50

R75-95

--

-

-

88

R126

Durometer

D2240

50-55

64

60-65

75

80

80

80-90

49-75

-

-

Coefficient of dynamic friction

0.7Mpa 3m/mis St

-

0.10

0.2

0.3

0.4

0.39

0.39

0.22

0.14

-

-

Electric properties

Specific volume resistivity

Ω . cm

D257

>1018

>1018

>1018

>1016

2x1014

2x1014

>1016

>1015

3x1016

>1016

Surface resistivity

Ω

D257

>1016

>1016

>1016

>1016

-

-

-

-

-

>1016

Dielectric breakdown voltage

1.8Th kv/mm

C149

19.2

20

20-24

16

10.4

20-24

18-48

19

20

19

Dielectric constant

60Hz

D150

<2.1

<2.1

2.1

2.6

8.4

2.5

3

2.3

3.65

3.25

Dielectric loss tangent

60Hz

D150

<0.0002

<0.0002

<0.0002

0.0006

0.049

0.0012

0.006

<0.0005

0.0039

0.002

Chemical   properties

Effect of sunlight

-

-

Acid resistance

-

D543

 

-

C543

Solvent resistance

-

-

Workability

-

-

 
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