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Index name

excellent grade

first grade

qualified

Appearance

colorless transparent liquid

Phosphorus oxychloride content%

≥99.5

≥99.0

≥98.0

Phosphorus trichloride content%

≤0.20

≤0.50

≤0.70

Boiling range(105-109 °C)(v/v)%

≥97.5

≥96.5

≥95.5