Aqueous Caustic Soda, otherwise known as Lye, is a solution of Sodium Hydroxide (NaOH) in water commonly used throughout the paper, aluminium and chemical industry. One of its many uses is also in water purification and water treatment across the world. It is widely used as a cleaning agent within both the domestic and industrial sectors. Caustic Soda crystalises at a temperature of 7°C and therefore it is important that the liquid is stored in an ambient temperature of above 7°C or protected in heated or insulated tanks. Endurachem’s Industrial and Chemical Dosing Tanks, suitable for the storage of Caustic Soda, are available supplied with external insulation as an optional extra.