Specifications: Industrial grade GB209-2006 Caustic soda flake/solid/pearl Composing 96% 98% 99% NaOH 96% Min. 98% Min. 99% Min. Na2CO3 1% Max. 0.5% Max. 0.4% Max. NaCl 2% Max. 0.03% Max. 0.015% Max. Fe2O3 0.01% Max. 0.005% Max. 0.001% Max. Outer packing: Flake: 25kg net PP/PE, kraft paper compounded bag Pearl: 25kg PP/PE, kraft paper compounded, pure PE bag Solid: 200kg, 400kg net iron drums.