Sodium tetraborate decahydrate acs reagent, ≥99.5% synonym: borax decahydrate, sodium borate decahydrate cas number 1303-96-4. linear formula na 2 b 4 o 7 · 10h 2 o . molecular weight 381.37 . ec number 215-540-4. mdl number mfcd00149193. pubchem substance id 329824630. nacres na.21 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. Alibaba offers 237 borax pentahydrate na2b4o7.5h2o products. about 60% of these are borate, 2% are other fertilizers, and 1% are other chemicals. a wide variety of borax pentahydrate na2b4o7.5h2o options are available to you, such as agriculture grade, industrial grade. Alibaba offers 827 sodium tetraborate pentahydrate products. about 17% of these are other chemicals, 4% are sulphate, and 2% are silicate. a wide variety of sodium tetraborate pentahydrate options are available to you, such as agriculture grade, industrial grade.