CAUSTIC SODA FLAKES SPECIFICATION-ION EXCHANGE MEMBRANE Product Name: Caustic Soda (Sodium Hydroxide ,Solid) Description: White Flakes Molecular Formula: NaOH Molecular Weight: 40.0 Grade: Industry IMDG Hazard class: 8 UN Number: 1823 Packaging group: â?¡ HS Number: 2815110000 CAS Number: 1310-73-2 Packing: In 25 kgs plastic woven bag