Borax Decahydrate 99.9% Technical Grade, Granular Na2B4O7.10H2O Technical grade sodium tetraborate decahydrate borax decahydrate granular Borax Decahydrate is the refined form of natural sodium borate. Composed of boric oxide (B2O3), sodium oxide, and water, it is a mild, alkaline salt, white and crystalline, with excellent buffering and fluxing properties. Available in powder or granular form, Borax Decahydrate is an important multifunctional source of B2O3, particularly for processes in which the simultaneous presence of sodium is beneficial. Specifications Na2B4O7.10H2O 95% B2O 36% SO2 0.2% Cl 0.05% Fe 0.005% water insoluble 0.04%