Phosphoric Acid Physical Properties

Pure phosphoric acid is a non-combustible, colourless, odourless and hygroscopic crystal. Commercial phosphoric acid comes as a viscous solution in water which contains 75-85% phosphoric acid. The liquid can solidify at lower temperatures.

Melting Point: 42°C (pure)

21°C (85%)

18°C (75%)

Boiling Point: 260°C (pure)

154°C (85%)

135°C (75%)

Specific Gravity: 1.88 (pure)

1.69 (85%)

1.58 (75%)

Vapour Density: 3.4 (pure)

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