... 40.82Relative Density(30°C), liquid, g/cm3 1.177Melting Point, °C-160.00Critical Temperature, °C96.15Critical Pressure, MPA4.75Ozonosphere ... ·°C)]0.16Critical density , g/cm30.526Vaporization heat below boiling point , KJ/Kg233.53. Quality Index (GB7373-87) GradeExcellent GradeFirst ... %≥99.899.599.0Moisture, % ≤0.0010.0020.005Acidity(as HCl), %≤0.000010.00010.0001evaporation residue, %≤0.010.010.02 Air ...