Common name: ammonium borate, chemical formula: NH4B2O8·5H2O, relative molecular weight: 272.15.
Physical and Chemical Properties
Ammonium borate is colorless bipyramidal crystals of orthOrhombic system. It is soluble in water, but insoluble in alcohol. Between 0~90℃, ammonium borate is stable solid and includes tetraborate and pentaborate. These two borates have the same moisture content and a wide range of conditions for existence. When heated to above 90℃, ammonium borate decomposes ammonium. When heated to 150℃, 75% crystal water loses, but there are ammonium losses of less than 1%. At temperature of 200℃ and pressure of 133Pa, ammonium borate contains only 1.15mol (4.85%) of crystal water and the ammonium loss is 2%. At high temperatures, it converts into boron trioxide with a small amount of ammonium.
Specifications
Heavy metal (in Pb)/% ≤0.002
Ammonium pentaborate/% ≥98
Chloride/% ≤0.001
Sulfate/% ≤0.001
Calcium and magnesium/% ≤0.01
Iron/% ≤0.01
Arsenic/% ≤0.001
Use
Used in industrial sectors such as telecommunications equipment, metal protection, glass manufacturing, wood processing, high temperature technology, fire protection, pharmacy, mining and metallurgy and textile and scientific research fields.
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