Properties

Thermal conductivity in international units (W/m.K)

With thermal conductivity of between 120 and 150 W/m.K, impervious graphite outperforms most materials used for constructing corrosion-resistant process equipment.

Thermal conductivity in imperial units (BTU.inch/hr.ft2.°F)

With thermal conductivity of between 830 and 1040 BTU.inch/hr.ft2.°F, impervious graphite outperforms most materials used for constructing corrosion-resistant process equipment.

Adhesion angle in degrees (°)

Impervious graphite has a very low adhesion angle compared to most materials of construction used in corrosive applications. This translates into a very low tendency to foul and a great cleanability. This makes graphite a perfect material of construction for condensers above glass-lined reactors in multipurpose plants.

Impervious graphite has a very low adhesion angle compared to most materials of construction used in corrosive applications

GPX 1, GPX 1T, and GPX 2 impervious graphite grades

GAB Neumann has developed 3 impervious graphite grades, namely our GPX 1, GPX 1T, and GPX 2.

Our GPX 1 is a homogenous, fine grain graphite impregnated with high viscosity phenolic resin and is suitable for most applications. It has a maximum design temperature of 180°C (356°F).

Our GPX 1T is a homogenous, fine grain graphite impregnated with high viscosity phenolic resin and is recommended for most applications above 160°C. It has a maximum design temperature of 200°C (392°F).

Our GPX 2 is a homogenous, fine grain graphite impregnated with high viscosity phenolic resin and is recommended for the most aggressive applications. It has a maximum design temperature of 200°C (392°F).

Raw graphite and impervious graphite properties in international units

Grades

Unit

GPX 1

GPX 1T

GPX 2

Raw graphite
(before impregnation)

Apparent density

g/cm3

1.67 to 1.73

1.67 to 1.73

1.77 to 1.79

Open porosities

%

about 20

about 20

about 15

Average grain size

mm

0.4

0.4

0.4

Maximum grain size

mm

0.8

0.8

0.8

Resistivity

μOhm.m

10

10

8

Dynamic modulus of elasticity

GPa

6 to 7

6 to 7

6 to 7

Flexural strength

MPa

9 to 10

9 to 10

16 to 18

Compressive strength

MPa

23 to 25

23 to 25

39 to 41

Tensile strength

MPa

6

6

6

Thermal expansion

10-6 K-1

2 to 3

2 to 3

2 to 3

Ash content

%

≤  0.07

≤  0.07

≤  0.07

Impregnated graphite

Apparent density

g/cm3

1.88 to 1.92

1.88 to 1.92

1.88 to 1.92

Open porosities

%

0

0

0

Thermal conductivity

W/m.K

≥ 120

≥ 120

≥ 150

Tensile strength

MPa

≥ 18

≥ 18

≥ 20

Maximum design temperature

°C

180

200

200

Raw graphite and impervious graphite properties in imperial units

Grades

Unit

GPX 1

GPX 1T

GPX 2

Raw graphite
(before impregnation)

Apparent density

lb/in3

0.060 to 0.063

0.060 to 0.063

0.064 to 0.065

Open porosities

%

about 20

about 20

about 15

Average grain size

mils

15

15

15

Maximum grain size

mils

31.5

31.5

31.5

Resistivity

μOhm.in

394

394

315

Dynamic modulus of elasticity

103.Psi

870 to 1015

870 to 1015

870 to 1015

Flexural strength

103.Psi

1305 to 1450

1305 to 1450

2320 to 2610

Compressive strength

103.Psi

3335 to 3625

3335 to 3625

5650 to 5945

Tensile strength

103.Psi

870

870

870

Thermal expansion

10-6.°F-1

1.1 to 1.6

1.1 to 1.6

1.1 to 1.6

Ash content

%

 0.07

 0.07

 0.07

Impregnated graphite

Apparent density

lb/in3

0.068 to 0.069

0.068 to 0.069

0.068 to 0.069

Open porosities

%

0

0

0

Thermal conductivity

BTU.inch/hr.ft2.°F

 830

 830

 1040

Tensile strength

103.Psi

 2.6

 2.6

 2.9

Maximum design temperature

°F

356

392

392

 

GAB Neumann GmbH | Alemannenstrasse 29 | D-79689 Maulburg | Phone +49 (7622) 6751 0 | Fax +49 (7622) 6751 20 | E-Mail info@gab-neumann.de | www.gab-neumann.com

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