... 1, UN NO.: 1564 Standard: GB/T1614-99 Industrial Grade ISO 9000 Barium carbonate 99.2% min used in barium salt,optical glass ... industry, ceramics, tile, water purifying, kinescope glass shell, optical glass, fluorescent light glass, construction material and making other barium salts5) ... 004%Fineness(Residue on 125um sieve)≤0.20% Cautions: 1, inorganic toxic chemicals, hazardous code 83004, kept in ...