Potassium fluoride is colorless cubic crystal or white powder,soluble in water, alkaline, insoluble in ethanol, easy to absorb moisture and irritation.At 42℃,KF•2H2O. water soluble 92g/100ml C=18 C is easy to form.The melting point is 858℃，the boiling point is 1502℃，the density is 2.48g/cm3。

Ammonium hydrogen fluoride is the crystallizationof the melting point 125 C boiling point 230 degree C density 1.5 white orcolourless clear inclined crystal system. The commodity is flaky and slightlyacidic. It is easily dissolved in water and decomposed in hot water, and thewater solution is strong acid.

Colorless solid or cubic crystals, slightly acidic,odorless, and bimodal compounds. It is soluble in water and insoluble inethanol.

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The melting point is 239 °C, and the density is 2.‍37g/cm3.

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