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Methyl mercaptanCH4S

CAS-No.:
74-93-1
UN-No.:
1064
EC-No.:
200-822-1
Hazard identification number:
263
Hazard signs
GHS02
GHS04
GHS06
GHS09

*Source: GESTIS Substance Database, https://gestis-database.dguv.de

Occupational exposure limit
ACGIH (US)
  • TWA (ppm) 0,5
  • TWA (mg/m3) 0,98
NIOSH (REL) (US)
  • STEL (ppm) C 0,5 (15min)
  • STEL (mg/m3) C 1 (15min)
NIOSH (US)
  • IDLH (ppm) 150
OSHA (PEL) (US)
  • STEL (ppm) C 10
  • STEL (mg/m3) C 20
  • H: 220
    Extremely flammable gas
  • H: 280
    Contains gas under pressure; may explode if heated
  • H: 331
    Toxic if inhaled
  • H: 410
    Very toxic to aquatic life with long lasting effects

*Source: GESTIS Substance Database, https://gestis-database.dguv.de

  • Melting point:
    -123 °C
  • Boiling Point:
    6 °C
  • Density (at 20 °C, if not notified otherwise):
    0,8665 g/cm3
  • Ionization:
    9.439 ± 0.005 eV
  • Flash Point:
    -18 °C
  • Ignition Temperature:
    360 °C
  • Vapour Pressure (at 20 °C, if not notified otherwise):
    1700 hPa
  • Lower Explosive Limit:
    4.1 Vol.-%
  • Upper Explosive Limit:
    21 Vol.-%
  •  

*Source: GESTIS Substance Database, https://gestis-database.dguv.de

Also known as:
  • H3CSH
  • Mercaptomethane
  • Methanethiol
  • Methyl sulfhydrate
  • Methyl thioalcohol
  • Thiomethanol

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