Caustic Soda Flakes (Sodium Hydroxide) (chemical formula NaOH, molecular weight 40.00, CAS: 1310‑73‑2, UN:1823) is a white flaky solid. It is a highly corrosive inorganic alkali, easily soluble in water with heat released. Widely used in soap making, detergent, textile bleaching, waste‑water treatment and paper‑making industry.