For over a century, u.s. borax has been mining, refining, and transforming boron into 20 mule team ® borax products that are essential to modern living. yet we’re anything but old fashioned. our scientists and technical experts, in concert with industry, community, and educational leaders around the globe, continually study, develop, and support new and better ways to put boron and Substance identity substance identity. the ‘substance identity’ section is calculated from substance identification information from all echa databases. the substance identifiers displayed in the infocard are the best available substance name, ec number, cas number and/or the molecular and structural formulas. Borax powder (sodium tetraborate) is a naturally occurring mineral with many uses. it is an organic compound. borax is in detergents, cosmetics, and enamels. you can use it to make slime, or other science projects! it dissolves in water to make sodium tetraborate solution.