High Purity Potassium chloride used as a fire extinguishing agent, used in portable and wheeled fire extinguishers. Known as Super-K dry chemical, Potassium chloride is metal halide salt resulting more effective than sodium bicarbonate-based dry chemicals and was compatible with protein foam.Application: Other names Sylvite common name Muriate of potash Potassium Chloride Identifiers CAS number [7447-40-7] RTECS number TS8050000 ChemSpiderID 4707 Properties Molecular formula KCl Molar mass 74.55 g/mol Appearance white crystalline solid Density 1.987 g/cm3 Melting point 775 °C Boiling point ca. 1500 °C Solubilityin water 28.1 g/100 ml (0 °C) 34.0 g/100 ml (20 °C) 56.7 g/100 ml (100 °C); Hazards MSDS ICSC 1450 EU Index Not listed Flash point Non-flammable LD50 2600 mg/kg (oral/rat), 142 mg/kg (intravenous/rat) Dose: Along with sodium chloride and lithium chloride, potassium chloride is used as a flux for the gas welding of aluminium.Note: Potassium chloride is rated for B and C fires as Fire Extinguisher