Borax Pentahydrate (Technical Powder) - Turkey

Brief Overview Borax pentahydrate, also known as Etibor 48 or sodium tetraborate pentahydrate, is the most common form of sodium borate used in various industries. It is a white, odorless crystalline granular or powder product that is mildly alkaline both alone and in solution. Compared to borax decahyrdate, which is physio-chemically comparable, Etibor 48 has a higher boron content per unit mass, a lower ratio of bound water and is less hygroscopic. Manufacturing Process High-purity sodium tetraborate pentahydrate is produced by: (a) Reacting the mineral colemanite (2CaO·3B2O3.5H2O) with sodium carbonate (Na2CO3) in an aqueous environment to produce an aqueous solution of sodium tetraborate and sodium hydroxide, with precipitation of solid calcium carbonate; (b) Treating the aqueous solution obtained in stage (a), after separating the precipitated calcium carbonate, with boric acid (H3BO3) to neutralize the sodium hydroxide and form a further quantity of sodium tetraborate; (c) Separating sodium tetraborate pentahydrate by crystallization from the aqueous solution obtained in stage (b).