Potassium Fluoride Chemical Properties Melting point: 858 °C(lit.) Boiling point: 1505 °C Density: 2.48 Vapor pressure: 1.3 hPa (885 °C) Fp: 1505°C Storage temp.: Store at RT. Solubility H2O: 1 M at 20 °C, clear, colorless Form: spray-dried Color: White Specific Gravity: 2.481 PH: 7.0-8.5 (25℃, 1M in H2O) Water Solubility: 92.3 g/100 mL (18 ºC) Sensitive: Hygroscopic