The specification of caustic soda as following: Caustic soda flakes: 96% 98% 99% Caustic soda solid: 96% 98% 99% Caustic soda pearls: 99% Caustic soda liquid: 49% Packing: Flakes or pearls: 25kg plastic bags (1layer PP & 2 PE) Solid: 200kg Iron drum (High of Drum: 90cm)