Sodium hydroxide, with chemical formula of NaOH, commonly known as caustic soda, is a strong caustic alkali, generally in flake or granular form, which is easily soluble in water (exothermic when dissolved in water) and forms an alkaline solution, and has deliquescence, and is easy to absorb water vapor (deliquescence) and carbon dioxide (deterioration) in the air.
This is White Flakes Caustic Soda.