Borax, anhydrous

Supplier: Avantor
Danger

Synonyms: BoraxSodium tetraborate

029-940-03 AMAS029-940-02
80705-012EA 291.1 CAD
80705-012 80700-078
Borax, anhydrous
di-Sodium tetraborate

Anhydrous Borax is used in almost all Fire Assay fluxes. It lowers the fusion temperature and aids in the formulation of slag.


Contributes to the fluidity of the slag which helps the pour.


Caution: Hydrated borax should be avoided as it often produces boil over.

Formula: Na₂B₄O₇
MW: 201.22 g/mol
MDL Number: MFCD00081185
CAS Number: 1330-43-4

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Specification Test Results

B₂O₃ 68.5 to 69.4%
Na₂B₄O₇ 99.98 to 100.31%
Na₂O 30.5 to 30.91%
H₂O 0 - 1.02%
Fe 0 - 0040%

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