2-Mercaptopropionic acid
Also known as: Thiolactic acid, 2-Mercaptopropanoic acid, (+/-)-2-Mercaptopropionic acid, 2-Thiolactic acid, Thiomilchsure, FEMA 3180, FEMA 3810, EINECS 201-206-5, MFCD00004862
2-Mercaptopropionic acid (CAS 79-42-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C3H6O2S and a molecular weight of 106.14400 g/mol. Key properties include a melting point of 10-14 °C(lit.), a boiling point of 102 °C16 mm Hg(lit.), a density of 1.196 g/mL at 25 °C(lit.) and a flash point of 87.8 °C. It is classified under GHS with signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.
- CAS No.
- 79-42-5
- Jingsj CID
- J-15285-2
- Molecular Formula
- C3H6O2S
- Molecular Weight
- 106.14400 g/mol
- Category
- Organic Acids
- Last updated
- 11/2/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 10-14 °C(lit.) |
|---|---|
| Boiling Point | 102 °C16 mm Hg(lit.) |
| Density | 1.196 g/mL at 25 °C(lit.) |
| Flash Point | 87.8 °C |
| Exact Mass | 106.00900 |
| PSA | 76.10000 |
| LogP | 0.38930 |
| Refractive Index | n20/D 1.481(lit.) |
| Additional Property | MISCIBLE |
GHS Safety & Compliance
- H314 — Causes severe skin burns and eye damage
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 2-Mercaptopropionic acid?
The CAS number of 2-Mercaptopropionic acid is 79-42-5.
What are the molecular formula and molecular weight of 2-Mercaptopropionic acid?
2-Mercaptopropionic acid has molecular formula C3H6O2S and molecular weight 106.14400 g/mol.
Is 2-Mercaptopropionic acid hazardous?
2-Mercaptopropionic acid has GHS signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage.
What are the upstream and downstream products of 2-Mercaptopropionic acid?
For 2-Mercaptopropionic acid, Upstream Products: Ethyl 2-mercaptopropionate, 3-Mercaptopropionic acid, Pyruvic acid; Downstream Products: 2,2,4-trimethyl-1,3-oxathiolan-5-one, 2-(allylthio)propanoic acid, 2-(ethylthio)propanoic acid.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2-Mercaptopropionic acid (CAS 79-42-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-15285-2 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.