4-Hydroxyisophthalic acid
Also known as: 4-Hydroxy-1,3-benzenedicarboxylic acid, 4-Hydroxybenzene-1,3-dicarboxylic acid, 1,3-Benzenedicarboxylic acid, 4-hydroxy-, Aspirin EP Impurity B, Acetylsalicylic acid impurity B, NSC 2445, EINECS 211-258-0, MFCD00010391
4-Hydroxyisophthalic acid (CAS 636-46-4) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C8H6O5 and a molecular weight of 182.130 g/mol. Key properties include a melting point of >300°C, a boiling point of 447.5±40.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 238.6±23.8 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed and H318 — Causes serious eye damage. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.
- CAS No.
- 636-46-4
- Jingsj CID
- J-20184-3
- Molecular Formula
- C8H6O5
- Molecular Weight
- 182.130 g/mol
- Category
- Organic Acids
- Last updated
- 11/3/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | >300°C |
|---|---|
| Boiling Point | 447.5±40.0 °C at 760 mmHg |
| Density | 1.6±0.1 g/cm3 |
| Flash Point | 238.6±23.8 °C |
| Exact Mass | 182.021530 |
| PSA | 94.83000 |
| LogP | 2.09 |
| Vapor Pressure | 0.0±1.1 mmHg at 25°C |
| Refractive Index | 1.666 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H318 — Causes serious eye damage
Customs & Trade Information
| HS Code | 2918290000 |
|---|---|
| Summary | HS: 2918290000 other carboxylic acids with phenol function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives Tax rebate rate:9.0% Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward) VAT:17.0% MFN tariff:6.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 4-Hydroxyisophthalic acid?
The CAS number of 4-Hydroxyisophthalic acid is 636-46-4.
What are the molecular formula and molecular weight of 4-Hydroxyisophthalic acid?
4-Hydroxyisophthalic acid has molecular formula C8H6O5 and molecular weight 182.130 g/mol.
Is 4-Hydroxyisophthalic acid hazardous?
4-Hydroxyisophthalic acid has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H318 — Causes serious eye damage.
What are the upstream and downstream products of 4-Hydroxyisophthalic acid?
For 4-Hydroxyisophthalic acid, Upstream Products: 4-Bromoisophthalic acid, 4-Nitrobenzonitrile, Ethyl 4-nitrobenzoate; Downstream Products: 5-Formyl-2-hydroxybenzoic acid, Dimethyl 4-hydroxyisophthalate, 2-hydroxy-5-(methoxycarbonyl)benzoic 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. "4-Hydroxyisophthalic acid (CAS 636-46-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-20184-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.