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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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