Tert-butanethiol
CAS 75-66-1
EC 200-890-2
Formula C4H10S
MW 90.19 g/mol
Flavors & Fragrances Oil, Gas & EnergyFood & Nutrition Flavoring & Acidulant
Description
Tert-Butanethiol (CAS 75-66-1), also known as t-Butylthiol, t-Butanethiol, and commercially as TBM, is an organosulfur compound with the molecular formula C4H10S. It carries no E-code designation. Its exceptionally low odour threshold makes it detectable at parts-per-billion concentrations.
In the oil and gas sector, tert-Butanethiol serves as a gas odorant, added to odourless fuel gases such as LPG and natural gas to enable leak detection by smell. In food applications, it functions as a flavouring agent, contributing roasted, meaty, or coffee-like sulphurous notes at precisely controlled trace levels in finished formulations.
Tert-Butanethiol is supplied in liquid form and is subject to REACH registration requirements within the European Union. It is handled under HS code 29309090. Procurement quantities and packaging formats should be confirmed directly with the supplier, as specifications may vary by grade and intended application.
In the oil and gas sector, tert-Butanethiol serves as a gas odorant, added to odourless fuel gases such as LPG and natural gas to enable leak detection by smell. In food applications, it functions as a flavouring agent, contributing roasted, meaty, or coffee-like sulphurous notes at precisely controlled trace levels in finished formulations.
Tert-Butanethiol is supplied in liquid form and is subject to REACH registration requirements within the European Union. It is handled under HS code 29309090. Procurement quantities and packaging formats should be confirmed directly with the supplier, as specifications may vary by grade and intended application.
Physical Properties
| Melting Point | -0.5 °C |
| Boiling Point | -63.7-64.2 °C @ Press: 760 Torr |
| Density | 0.80 g/cm³ |
| Flash Point | −12 °F |
| Appearance | liquid with an exceedingly unpleasant smell |
| Color | Clear colorless |
| Odor | sulfury |
| Form | Liquid |
| Water Solubility | Slightly soluble in water |
| Vapor Pressure | 303.5 mm Hg ( 37.7 °C) |
| Refractive Index | n 20/D 1.423(lit.) |
| Log P | 2.206 (est) |
Safety & Handling (Learn More)
Danger GHS02 GHS07 GHS08 GHS09
H
H225H304H317H319H320H335H336H373H411
P
P210P233P240P241P242P243P260P261P271P272P273P280P319P321P331P391P405P501P264+P265P301+P316P302+P352P304+P340P333+P317P337+P317P362+P364P370+P378P403+P233P403+P235P303+P361+P353P305+P351+P338
Trade & Regulatory
| HS Code | 29309090 |
| UN Number | 2347 |
| ADR Class | 3 |
| Packing Group | II |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 3 |
Other Names
Tert-Butylthioltert-butyl mercaptan2-methylpropane-2-thiol2-methyl-2-propanothiolTBM(TM)t-Butylthiolt-Butanethiol
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