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Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound. It is a white solid and highly caustic metallic base and alkali of sodium which is available in pellets, flakes, granules, and as prepared solutions at a number of different concentrations. Sodium hydroxide forms an approximately 50% (by weight) saturated solution with water. Caustic Soda, or Sodium Hydroxide, is used in the manufacture of products which form part of our daily lives. These include applications such as paper, detergents, building and car industries, packaging, agriculture, environmental protection, water treatment, foodstuffs, health and textiles, and many more. Caustic Soda, or Sodium Hydroxide, is used in the manufacture of products which form part of our daily lives. These include applications such as paper, detergents, building and car industries, packaging, agriculture, environmental protection, water treatment, foodstuffs, health and textiles, and many more.