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Chemicals: n-Heptane Disclaimer n-Heptane Name: Heptane Synonym(s): n-Heptane Formula: CH3[CH2]5CH3 CAS Number: 142-82-5 Formula Weight: 100.2 Vapor Pressure: 40 mm Hg at 72°F Boiling Point: 209°F Freezing Point: -131°F Solubility: 0.0003% Ionization Potential: 9.90 eV Specific Gravity: 0.68 Notes: Colorless, flammable liquid with a gasoline-like odor. A constituent of gasoline. Excerpted from NIOSH Pocket Guide to Chemical Hazards, US GPO 1997 J551-571