Division 39Production of sodium silicate glass

### Division 39—Production of sodium silicate glass 339 (1) The production of sodium silicate glass is the physical and chemical transformation of silicon dioxide (SiO2, silica) and sodium carbonate (Na2CO3, soda ash) into saleable sodium silicate glass where the concentration of sodium silicate (Na2SiO3) is at least 99% with respect to mass. (2) The production of sodium silicate glass is specified as an emissions‑intensive trade‑exposed activity. (3) The production of sodium silicate glass is a highly emissions‑intensive activity. (4) The basis for the issue of free carbon units for the production of sodium silicate glass is by a tonne of sodium silicate glass on a dry weight basis that: (a) has a concentration of sodium silicate (Na2SiO3) that is at least 99% with respect to mass; and (b) is produced by carrying on the emissions‑intensive trade‑exposed activity; and (c) is of saleable quality. > Note: Saleable quality is explained in Part 2.