55 lbs Bag - Assay Borax Anhydrous

55 lbs - Borax Anhydrous - (Sodium Tetraborate Anhydrous) - Lab / Assay Grade

Other common names include:

Sodium Borate, Sodium Tetraborate, Borax, Calcined Borax, Dehydrated Borax, Pyrobor

Sold by the Each (55 lbs) Bag

For use as an assaying flux (or flux thinner) for melting or smelting gold and other precious metals.

Analysis / Specification

Boric Oxide (B2O3) - 68.4% min

Elemental Boron - 21.24%

Sodium Oxide (Na2O) - 30.45% min

Sulfate as SO4 - 300 ppm max

Cl - 105 ppm max

Total Iron (Fe) - < 50 ppm

US Sieve No. +12 - 5% max

CAS 1330-43-4