… not more than 85 % of H3BO3 calculated on the dry weight. …
Explanatory notes
… not more than 85 % of H 3 BO 3 calculated on the dry weight. This heading covers only natural borate minerals as … water drawn from underground sources in those regions. However, the heading excludes boric acid containing more than 85 % of H 3 BO 3 calculated on the dry weight ( heading 28.10 ). The natural borates classified …