SPECIFIC GRAVITY @ 15°C (59°F) : 2.907 FREEZING POINT or RANGE : 290°C (554°F) SOLUBILITY IN WATER : Completely BOILING POINT : 732°C (1350°F) VAPOR PRESSURE : Practically zero. PH < 2 (concentrated solutions) ; 4.0 (10% solution) APPEARANCE AND COLOR : This product is an odorless, white, granular solid.