... brand Caustic Soda: Character & Purpos white flake ,pearl and solid, mainly used in the fields of metallurgy,petroleum,chemical industry,textile, ... papermaking,printing and dyeing, pharmacy,soap,etc. Spec for Flake & Solid:99%MIN NaOH0.7%MAX98% ... MIN96%MIN Na2CO30.1% MAX0.7%MAX1.4%MAX NaCL0 ...