3-Methyl-1-butanethiol
Also known as: Isoamyl mercaptan, ISOAMYLTHIOL, Isopentyl mercaptan, 3-Methylbutanethiol, 3-methylbutane-1-thiol, Isopentanethiol, Isopentylmercaptan, isoamylthiol, isopentylthiol, FEMA 3858, MFCD00004899
3-Methyl-1-butanethiol (CAS 541-31-1) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C5H12S and a molecular weight of 104.214 g/mol. Key properties include a boiling point of 114.8±8.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 18.3±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 541-31-1
- Jingsj CID
- J-8188-9
- Molecular Formula
- C5H12S
- Molecular Weight
- 104.214 g/mol
- Category
- Alcohols
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 114.8±8.0 °C at 760 mmHg |
|---|---|
| Density | 0.8±0.1 g/cm3 |
| Flash Point | 18.3±0.0 °C |
| Exact Mass | 104.065971 |
| PSA | 38.80000 |
| LogP | 2.66 |
| Vapor Pressure | 23.2±0.2 mmHg at 25°C |
| Refractive Index | 1.440 |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2930909090 |
|---|---|
| Summary | 2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 3-Methyl-1-butanethiol?
The CAS number of 3-Methyl-1-butanethiol is 541-31-1.
What are the molecular formula and molecular weight of 3-Methyl-1-butanethiol?
3-Methyl-1-butanethiol has molecular formula C5H12S and molecular weight 104.214 g/mol.
Is 3-Methyl-1-butanethiol hazardous?
3-Methyl-1-butanethiol has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3-Methyl-1-butanethiol (CAS 541-31-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-8188-9 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.