The chemical compound 1-Butanol, also known as butan-1-ol, is a reference substance for gas chromatography (GC) analysis. It has a molecular formula of C4H10O with a molecular weight of 74.12 g/mol and an exact mass of 74.073164938 u. This substance boils at 243.9°F under standard pressure and freezes at -129°F. Its density is 2.6 times that of air. According to the Globally Harmonized System (GHS), it carries a warning signal word due to its flammability and potential to cause serious eye damage.

• CAS Number: 71-36-3
• Molecular Formula: C4H10O
• Molecular Weight: 74.12
• Exact Mass: 74.073164938
• Boiling Point: 243.9 °F at 760 mmHg (USCG, 1999)
• Melting Point: -129 °F (USCG, 1999)
• Density: 2.6 (Air = 1)
• GHS Signal Word: Warning
• Hazard Statements:
• H226: Flammable liquid and vapor [Warning Flammable liquids]
• H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]