Mercaptan mix

Mercaptan mix is used as a gas odorant and is added to odorless gases and fuels in order to detect leaks. The main constituent of this mercaptan mixture is t-Butyl Mercaptan.


Chemical Formula

EC Number


CAS Number


  • Gas odorants
  • Natural gas
  • LPG


  • t-Butyl Mercaptan: 75-80 wt%
  • Isopropyl Mercaptan: 13-18 wt%
  • n-Propyl Mercaptan: 3-8 wt%
  • Flash point : -18°C
  • Lower explosion limit : 1.4%(V)
  • Upper explosion limit : 12.5%(V)
  • Oxidizing properties : No
  • Autoignition temperature : 200°C
  • Boiling point/boiling range : 57-60°C
  • Vapor pressure: 48 kPa at 38°C
  • Relative density: 0.81 at 16°C
  • Water solubility: Negligible
  • Relative vapor density: 2
  • Evaporation rate: >1
  • Percent volatile: >99 %

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