Graphite sheet is selected from the high purity flake graphite. They can be reinforced by metal mesh, foil, or tanged metal. They are made through chemical treatment, expanded under high temperature, and then rolling. It offers excellent sealing capabilities under extreme conditions with a longer life and less maintenance.
| Item | Industrial grade | Nuclear grade |
| Tolerance of density g/cm3 | +/-0.06 | +/-0.05 |
| Carbon content % | 98/99 | 99.5 |
| Tensile strength Mpa | 4 | 5 |
| Compressibility % | 30 | 30 |
| Recovery % | 15 | 15 |
| Sulphur content | 1200 | 700 |
| Chlorine content | 50 | 25 |
| Stress relaxation rate % | 10 | 10 |
| Lgnition loss | 2.0 | 0.5 |
Dimensions:
| Item | Sheets | Rolls |
| Density g/cm3 | 1.0 | 1.0 |
| Length | 1000, 1500mm | 30~100m |
| Width mm | 5~1000, 1500 | 3~1000~1500 |
| Thickness mm | 0.5~3 | 0.2~1.1 |
