Substance name: borax [iso] rn: 1303-96-4 unii: 91mbz8h3qo inchikey: cdmadvzslohifp-uhfffaoysa-n Cas rn 1303-96-4 sodium borate. spectrum chemical manufactures and distributes fine chemicals with quality you can count on including those with cas number 1303-96-4, whether you call it sodium borate or borax you can be assured the products offered by spectrum, meet or exceed the grade requirements or specifications for each individual product. Di-sodium tetraborate decahydrate certified secondary standard reference material for ph measurement; directly traceable to primary srm from nist/ptb ph(s)=9.18₀ (25°c) certipur®. cas 1303-96-4. It is used in detergents, cosmetics, and enamel glazes. it is likewise employed to prepare buffer solutions in biochemistry, as a fire retardant, anti-fungal compound, in the manufacture of fiberglass, as a flux in metallurgy, neutron-capture shields for radioactive sources, a texturing agent in cooking, and as a harbinger for other boron compounds.