With thermal conductivity of between 120 and 150 W/m.K, impervious graphite outperforms most materials used for constructing corrosion-resistant process equipment.
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.
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.
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).
Grades |
Unit |
GPX 1 |
GPX 1T |
GPX 2 |
|
Raw graphite |
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 |
Grades |
Unit |
GPX 1 |
GPX 1T |
GPX 2 |
|
Raw graphite |
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
79689 Maulburg
Germany
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