Ethanethiol, commonly known as ethyl mercaptan, is a colorless gas added to LPG in order to detect its leakage.

Apart from ethyl mercaptan, is there any gas or liquid that may be used as a replacement to this?

  • $\begingroup$ Methyl mercaptan is also used as an oderant. $\endgroup$ Commented Jun 8, 2019 at 20:16

1 Answer 1


Why would one want to replace it?

The choice of ethanethiol is a reasonable compromise between its toxicity and the extremely low detection limit around 1 ppb (1mg/1000 kg).

  • 4
    $\begingroup$ I guess they don't like the smell. $\endgroup$ Commented Apr 13, 2019 at 17:47
  • $\begingroup$ it's also worth mentioning that thiols are preferred over amines, to which human noses are also extremely sensitive, because humans desensitize to amines much more quickly than thiols. $\endgroup$
    – Andrew
    Commented Feb 16, 2021 at 19:34

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