4-Hydroxybenzoic acid
Also known as: p-Hydroxybenzoic acid, 4-Carboxyphenol, p-Salicylic acid, p-carboxyphenol, para-Hydroxybenzoic acid, Benzoic acid, 4-hydroxy-, ACETYLSALICYLIC ACID IMPURITY A (ASPIRIN IMPURITY A), PROPYL PARAHYDROXYBENZOATE IMP. A (EP): 4-HYDROXYBENZOIC ACID
4-Hydroxybenzoic acid (CAS 99-96-7) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C7H6O3 and a molecular weight of 138.121 g/mol. Key properties include a melting point of 213-217 °C(lit.), a boiling point of 336.2±25.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 171.3±19.7 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 99-96-7
- Jingsj CID
- J-8741-2
- Molecular Formula
- C7H6O3
- Molecular Weight
- 138.121 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 213-217 °C(lit.) |
|---|---|
| Boiling Point | 336.2±25.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 171.3±19.7 °C |
| Exact Mass | 138.031693 |
| PSA | 57.53000 |
| LogP | 1.42 |
| Vapor Pressure | 0.0±0.8 mmHg at 25°C |
| Refractive Index | 1.616 |
| Additional Property | 5 g/L (20 ºC) |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Activity & Biological Data
| Target | Human Endogenous Metabolite Bacteria:160 μg/mL (IC50) |
|---|---|
| Additional Information | [1]. Cho JY, Antimicrobial activity of 4-hydroxybenzoic acid and trans 4-hydroxycinnamic acid isolated and identified from rice hull. Biosci Biotechnol Biochem. 1998 Nov;62(11):2273-6. |
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-Hydroxybenzoic acid?
The CAS number of 4-Hydroxybenzoic acid is 99-96-7.
What are the molecular formula and molecular weight of 4-Hydroxybenzoic acid?
4-Hydroxybenzoic acid has molecular formula C7H6O3 and molecular weight 138.121 g/mol.
Is 4-Hydroxybenzoic acid hazardous?
4-Hydroxybenzoic acid has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of 4-Hydroxybenzoic acid?
For 4-Hydroxybenzoic acid, Upstream Products: 4-Hydroxybenzyl alcohol, 4-Bromobenzoic acid, 4-Iodobenzoic acid; Downstream Products: Methyl 4-(pyridin-4-yl)benzoate, 4-Chlorobenzotrichloride, 4-Methylanisole.
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-Hydroxybenzoic acid (CAS 99-96-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-8741-2 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.