Search results for borax at sigma-aldrich. compare products: select up to 4 products. *please select more than one item to compare There are 44 sodium borax solid suppliers, mainly located in asia. the top supplying countries or regions are china, turkey, and canada, which supply 90%, 4%, and 4% of Jan 31, 2020 · borax is a natural mineral with a chemical formula na 2 b 4 o 7 • 10h 2 o. borax also is known as sodium borate, sodium tetraborate, or disodium tetraborate. it is one of the most important boron compounds. the international union of pure and applied chemistry (iupac) name for borax is sodium tetraborate decahydrate. Anhydrous borax is white solid crystalline product used in gold smelting as a flux. the advantages of using borax in gold smelting are: facilitates separation of the gold from gangue at lower temperatures; borax forms a structural network with rock silicates that captures metal ions which normally associate with oxides eg.