Index name
excellent grade
first grade
qualified
Appearance
colorless transparent or light yellow liquid
Phosphorus trichloride content%
≥99.0
≥98.5
≥98.0
Free phosphor content%
≤0.0005
≤0.0020
≤0.0080
Boiling range(74.5-77.5°C)(v/v)%
≥97.0
≥96.0
≥95.0
Phosphoric acid content(PO4-2)
0.2
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