BORIC ACID 99,8% MSR Formula H3BO3 Molecular Weight 61.83 Purity as B element 17.5 % Max. Purity as H3BO3 99.8 % Mín.     The following are the specifications of Boric Acid 99,8% MSR: B2 O3 56.1 % Mín. Sulphate (SO4=) 0.15 % Máx. Chloride (Cl-) 0.10 % Máx. Iron (Fe3+) 0.003 % Máx. Humidity 0.100 % Máx. Insoluble matter in water 0.05 % Máx.