... 28151100 3. Purity: 96%, 99%, etc 4. Appearance: Flakes, Pearl (white or light blue) Caustic sodaCas no.: 1310-73-2 properties ... (Mainland)Grade Standard: Industrial GradePurity: 99% minAppearance: solid; liquid; white or light blueApplication: metallurgy, petroleum, chemical in...properties: solid; liquid ... 3. Purity: 96%, 99%, etc 4. Appearance: Flakes, Pearl (white or light blue) Caustic Soda