... Purity: 96%, 99%, etc 4. Appearance: Flakes, Pearl (white or light blue) Caustic sodaCas no.: 1310-73-2 properties:solid; liquid; white ... , printing and dyeing pharmacy, soap, etc.Standard of identity: Caustic Solid GB209-2006.Details name of specification /gradesodium hyroxide by ion ... 73-2 2. HS Code:28151100 3. Purity: 96%, 99%, etc 4. Appearance: Flakes, Pearl (white or light blue) Caustic Soda 99%