SODIUM CHLORIDE 0.05% max (as NaCl on Dry Base) SODIUM SULFATE 0.15% max (as Na2SO4 on Dry Base) INSOLUBLES IN WATER 0.1% max BULK DENSITY 400-700 kg/m3 Sodium carbonate (Na2CO3), molecular weight 105.99. The purity of chemicals is mostly above 99.5% (mass ...