Isobutyric acid
Also known as: 2-Methylpropanoic acid, 2-Methylpropionic acid, Dimethylacetic acid, Isopropyl formic acid, α-Methylpropanoic acid, α-Methylpropionic acid
Isobutyric acid (CAS 79-31-2) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C4H8O2 and a molecular weight of 88.105 g/mol. Key properties include a melting point of -47 °C, a boiling point of 155.2±8.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 55.6±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H226 — Flammable liquid and vapour, H302 — Harmful if swallowed and H311 — Toxic in contact with skin. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 79-31-2
- Jingsj CID
- J-19144-6
- Molecular Formula
- C4H8O2
- Molecular Weight
- 88.105 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -47 °C |
|---|---|
| Boiling Point | 155.2±8.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 55.6±0.0 °C |
| Exact Mass | 88.052429 |
| PSA | 37.30000 |
| LogP | 0.59 |
| Additional Property | 3.04 (vs air) |
| Vapor Pressure | 1.6±0.6 mmHg at 25°C |
| Refractive Index | 1.408 |
| Additional Property | 210 g/L (20 ºC) |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
- H302 — Harmful if swallowed
- H311 — Toxic in contact with skin
- H314 — Causes severe skin burns and eye damage
Customs & Trade Information
| HS Code | 2915600000 |
|---|---|
| Summary | 2915600000 butanoic acids and pentanoic acids and their salts and esters VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:5.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Isobutyric acid?
The CAS number of Isobutyric acid is 79-31-2.
What are the molecular formula and molecular weight of Isobutyric acid?
Isobutyric acid has molecular formula C4H8O2 and molecular weight 88.105 g/mol.
Is Isobutyric acid hazardous?
Isobutyric acid has GHS signal word Danger and hazard statements H226 — Flammable liquid and vapour; H302 — Harmful if swallowed; H311 — Toxic in contact with skin.
What are the upstream and downstream products of Isobutyric acid?
For Isobutyric acid, Upstream Products: Propane Residual Solvent Standard, Isobutyraldehyde, Methacrylic acid; Downstream Products: 2-(propan-2-yl)-1H-benzimidazole, 3-Ethoxy-2,2-dimethyl-3-oxopropanoic acid, 2,2-Dimethylmalonic 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. "Isobutyric acid (CAS 79-31-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-19144-6 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.