n-Butylamine — properties & hazards overview

Name: n-Butylamine Formula: C₄H₁₁N CAS: 109-73-9 UN: 1125 (flammable, corrosive liquid)
DANGER — Flammable, corrosive, toxic amine. Vapours irritate eyes and respiratory tract; reacts strongly with acids and oxidants. Use acidic scrubbing (e.g., dilute H₂SO₄) with demisting and explosion-proof ventilation.
Boiling point
77.9 °C
Flash point
−14 °C (closed cup)
Flammability (air)
LEL 1.7% – UEL 10.5%
Water solubility
Miscible
Toxicity
caustic vapour
Flammability
FP −14 °C
Chronic risk
sensitisation
Environmental
aquatic toxicity
PropertyValue / Note
Chemical formulaC₄H₁₁N
Molar mass73.14 g/mol
Physical state (20 °C)Colourless liquid, strong ammonia-like odour
Density0.74 g/cm³ @ 20 °C
Vapour pressure≈ 27 kPa @ 25 °C
Odour threshold≈ 0.1 ppm (very low)
pKa (conjugate acid)≈ 10.7
Typical usesIntermediate for pesticides, rubber, dyes, and corrosion inhibitors

*Values are indicative; confirm using SDS or process data for safe design.

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