Explanatory notes
… OF BORON Diboron trioxide (Boron sesquioxide) (B 2 O 3 ) exists as transparent vitreous masses, crystals or white … the manufacture of borosilicate glass (low coefficient of expansion), vitrifiable compounds, Guignet’s green (hydrated … , calculated on the dry weight; when the H 3 BO 3 content exceeds 85 %, the acid is classified in this heading. …