75-66-1
Product Name:
2-Methyl-2-propanethiol
Formula:
C4H10S
Synonyms:
tert-Butyl mercaptan;TBM
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Tert-butyl mercaptan is a foul-smelling organosulfur compound which is a colorless, clear liquid at ambient temperatures. It is primarily used as an odorant for natural gas, and it has an odor threshold of less than 0.33 ppb. Non-toxic at the very low concentrations used in natural gas, but the smell can cause nausea at concentrations as low as 2-3 ppm. The pure chemical is highly flammable and may cause skin and eye irritation upon direct exposure. |
|---|---|
| Color/Form | Mobile liquid |
| Odor | Heavy skunk odor |
| Boiling Point | 149-153 °F at 760 mmHg (NFPA, 2010) |
| Melting Point | -32 °F (ICSC, 2023) |
| Flash Point | less than -20 °F (NFPA, 2010) |
| Solubility | Insoluble (NFPA, 2010) |
| Density | 0.8 (NFPA, 2010) - Less dense than water; will float |
| Vapor Density | 3.1 (NFPA, 2010) - Heavier than air; will sink (Relative to Air) |
| Vapor Pressure | 142.5 mmHg at 68 °F (ICSC, 2023) |
| Stability/Shelf Life | Remarkably stable to oxidizing agents. |
| Decomposition | The substance decomposes on burning producing toxic gases including sulfur oxides. |
| Odor Threshold | Odor Threshold Low: 0.00081 [mmHg] The Guide in the Emergency Response Guidebook is for "Butyl mercaptan." Odor threshold (100% recognition) from CHEMINFO |
| Refractive Index | Index of refraction: 1.41984 at 25 °C/D |
| Dissociation Constants | pKa = 11.22 at 25 °C |
| Kovats Retention Index | 584 594 595 587 589 |
| Other Experimental Properties | WT/GALLON: 6.71 LB; DISTILLATION RANGE: 62-67 °C |
| Chemical Classes | Other Classes -> Thiols |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Exclamation Mark Irritant GHS07  Environment GHS09 |
| GHS Hazard Statements |
H225:Flammable liquids H317:Sensitisation, Skin H411:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P240:Ground/bond container and receiving equipment. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. |
COMPUTED DESCRIPTORS
| Molecular Weight | 90.19 g/mol |
|---|---|
| XLogP3 | 1.5 |
| Hydrogen Bond Donor Count | 1 |
| Hydrogen Bond Acceptor Count | 1 |
| Rotatable Bond Count | 0 |
| Exact Mass | 90.05032149 g/mol |
| Monoisotopic Mass | 90.05032149 g/mol |
| Topological Polar Surface Area | 1 Ų |
| Heavy Atom Count | 5 |
| Formal Charge | 0 |
| Complexity | 25.1 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Tert-butyl mercaptan is a foul-smelling organosulfur compound which is a colorless, clear liquid at ambient temperatures. It is primarily used as an odorant for natural gas, and it has an odor threshold of less than 0.33 ppb. Non-toxic at the very low concentrations used in natural gas, but the smell can cause nausea at concentrations as low as 2-3 ppm. The pure chemical is highly flammable and may cause skin and eye irritation upon direct exposure.