Barium metaphosphate (Ba(PO3)2)-Powder

Characteristic

Barium metaphosphate is an inorganic substance with the molecular formula Ba(PO₃)₂. It is a colourless solid that is insoluble in water, though is soluble in acidic solutions through "slow dissolution". 

Chemical formula：Ba(PO₃)₂

Molar mass：295.27 g/mol

Appearance：Powder

Density：3.63 g/cm³

Melting point：1,560 °C (2,840 °F; 1,830 K)

Application

The combination of sodium and barium polyphosphate forms a low-melting glass with a high coefficient of thermal expansion. The melting point of the glass increases with barium content. This glass makes seals with low melting metals like aluminium (melting point 650 °C). Normal borosilicate glasses soften above the melting point of aluminium. This mixture is prepared by heating a mixture of diammonium phosphate, sodium carbonate, and barium carbonate.