... 99% Sodium Hydroxide (NaOH) 99% CAS NO.:1310-73-2 Used in soap-making, synthetic detergent, printing Specification:(Flakes) 99%ITEMSTANDARDNaOH, % ≥99. ... 0Na2CO3,% ≤0.8NaCL,% ≤0.05Fe2O3,% ≤0.005ITEMSTANDARDNaOH, % ≥98.0Na2CO3,% ≤0.9NaCL, % ≤0.05Fe2O3,% ≤0.005ITEMSTANDARDNaOH, % ≥96.0Na2CO3 ... metallurgy,artificial fiber,water treatment etc. Sodium Hydroxide Flakes 99%