... %<=0.03 Na2CO3%<=0.5 Fe2O3%<=0.005 passed SGS BV test packing:200kg/drum.. MF: NaOH Custic soda,NaOHItems Specification Flakes ... % Max Fe2O3 0.008% Max 0.005% Max Surface White Flakes/Pearls/Solid Uses:Synthetical detergence, textile, paper making,printing,dyeing ... & Paint ,Acid & Salts, Rubber Accelerators & Antioxidants,Water Treatment Chemicals. 99%Flakes Caustic soda