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Appearance and properties:white or light yellow crystalline
Nitrogen (N) content: 21.0% min
Water: 0.2 Max
Free acid: 0.05 Max
Melting point (℃) : 230-280 ℃
The refractive index: n20 / D 1.396
Relative density (water = 1) : 1.77
Relative vapor density (air = 1) : 7.9
Ammonium sulfate
