Product name: Caustic Soda Flakes Packing: 25 Kg bags inside big bags or on pallets CAS Number: 1310-73-2 HS Code: 28.15.11.00 Manufacturer country: Iran Supplier and exporter: Novichem Co. Caustic Soda also known as Sodium hydroxide with formula of NaOH and CAS number: 1310-73-2 is an inorganic compound which is called Caustic Soda due to its highly corrosive nature. It is used in wide range of industrial applications and is produced in many forms such as liquid, flakes.