683Production of fused alumina

#### 683 Production of fused alumina (1) The production of fused alumina is the physical transformation of alumina (aluminium oxide (Al2O3)) by heating it to its fusion point to produce fused alumina that: (a) has an alpha alumina crystalline structure; and (b) has a concentration of aluminium oxide equal to or greater than 99.0%. (2) The production of fused alumina is specified as an emissions‑intensive trade‑exposed activity.