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Chemicals: Hafnium Disclaimer Hafnium Name: Hafnium Synonym(s): - Formula: Hf CAS Number: 7440-58-6 Formula Weight: 178.5 Vapor Pressure: Negligible Boiling Point: 8316°F Freezing Point: 4041°F Solubility: Insoluble Ionization Potential: NA Specific Gravity: 13.31 Notes: Highly lustrous, ductile, grayish solid. Explosive in powder form. Excerpted from NIOSH Pocket Guide to Chemical Hazards, US GPO 1997 J551-571