5003 Tetraboron disodium heptaoxide, hydrate Tetraboron disodium heptaoxide, hydrate was included in June 2010 in the European Chemicals Agency (ECHA) list of Substances of Very High Concern (SVHC) due to its being toxic for reproduction. Substances in the list of SVHCs are those for which ECHA is considering imposing a requirement for authorization for some or all uses. 12267-73-1 B4H2Na2O8 White powder. No indication of carcinogenicity to humans (not listed by IARC). 2014-09-17T20:02:19Z 2026-04-06T17:03:41Z true [B+3].[B+3].[B+3].[B+3].O.[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Na+].[Na+] B4H2Na2O8 InChI=1S/4B.2Na.H2O.7O/h;;;;;;1H2;;;;;;;/q4*+3;2*+1;;7*-2 IYVLDXPWJCXWQU-UHFFFAOYSA-N 219.235 219.991728254 Exogenous Solid CHEM003904 DTXSID901028874 NS00134404 0.0 0.0 1.7784 0 0 0 3 0