... Code:28151100 3. Purity: 96%, 99%, etc 4. Appearance: Flakes, Pearl (white or light blue) Caustic sodaCas no.: 1310-73-2 ... identity of flaky caustic soda flakes: name of specification\ grademembrance processdiaphragrn processNaOH %≥9996.0Na2CO3 %≤1.01.3NaCl %≤0.32.7Fe2O3 %≤0.010.008 ... 73-2 2. HS Code:28151100 3. Purity: 96%, 99%, etc 4. Appearance: Flakes, Pearl (white or light blue) Caustic Soda 99%