We can offer Calcined Boro Oxide (B2O3), origin Peru, with following specs:

B  14% min.

B2O3  45% min.

CaO  14%-22%

NaO  10%-18%

SiO2  2%-6%

MgO  1%-3%

SO4  4%-8%

Cl  3%-8%

Humidity  1% max.

PH  8.5 aprox