Custom‑manufactured graphite crucibles adopt superior industrial application approaches, marking the onset of design requirements for emerging future industries, and there is a greater need to advocate the spirit of craftsmanship in industry.

Graphite crucibles feature high bulk density, high‑temperature resistance, rapid heat transfer, resistance to acid and alkali corrosion, high high‑temperature strength, and excellent oxidation resistance. Accordingly, graphite crucibles are inevitably utilised to handle corrosive substances during operation. Though graphite crucibles are resistant to acids and alkalis, cleaning them after refining certain raw materials can be extremely cumbersome.

The core task of cleaning graphite crucibles is to remove chemical substances inside the crucible, and the cleaning method is determined by the residues present within it. Generally, deposits on graphite crucibles are inorganic combustion residues. Hydrochloric acid can be used for cleaning, as most of such residues are soluble in it. Some carbon‑containing residues cannot be dissolved by hydrochloric acid, in which case nitric acid may be employed for cleaning due to its strong oxidising property; moderate heating is permissible during the cleaning process. Graphite crucibles must be kept clean, with bright inner and outer surfaces. Prolonged heating may cause the crucible surface to turn dull, and this condition can penetrate inward over time, rendering the crucible brittle and prone to cracking. Contaminants must therefore be removed. Should spots or blackened areas remain on the surface, gently rub the surface with 100‑mesh fine sand with no sharp edges to restore its luster.