Tokai Carbon Group has speciality products such as purified graphite used in the semiconductor industry. Following graphitization the blocks are subjected to further heat treatment that can lower the value of the ash content to less than 5ppm. This super purified material is vital for the production of silicon chips used for the production of integrated circuits and solar cells.
Typical Impurities Analysis
| Impurity (ppm) | |||||||||
| Grade | Al | B | Ca | Fe | Ni | Si | Ti | V | Total Ash |
| Standard | 0.48 | 1.5 | 74 | 15 | 1.7 | 23 | 28 | 7.6 | 300 |
| S | <0.08 | 1.0 | <0.04 | 0.06 | <0.1 | 1.5 | <0.09 | <0.07 | <20 |
| SS | <0.08 | 0.9 | <0.04 | <0.04 | <0.1 | <0.1 | <0.09 | <0.07 | <5 |
