Hydroquinone
Also known as: 1,4-Benzenediol, 1,4-Dihydroxybenzene, HQ, Quinol, p-dihydroxybenzene, p-Benzenediol, Benzene-1,4-diol, p-Hydroquinone
Hydroquinone (CAS 123-31-9) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C6H6O2 and a molecular weight of 110.111 g/mol. Key properties include a melting point of 172-175 °C(lit.), a boiling point of 286.0±0.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 141.6±14.4 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H317 — May cause an allergic skin reaction and H318 — Causes serious eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 123-31-9
- Jingsj CID
- J-965975-1
- Molecular Formula
- C6H6O2
- Molecular Weight
- 110.111 g/mol
- Category
- Alcohols
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 172-175 °C(lit.) |
|---|---|
| Boiling Point | 286.0±0.0 °C at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 141.6±14.4 °C |
| Exact Mass | 110.036781 |
| PSA | 40.46000 |
| LogP | 0.64 |
| Additional Property | 3.81 (vs air) |
| Vapor Pressure | 0.0±0.6 mmHg at 25°C |
| Refractive Index | 1.612 |
| Additional Property | 70 g/L (20 ºC) |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H317 — May cause an allergic skin reaction
- H318 — Causes serious eye damage
- H341 — Suspected of causing genetic defects
- H351 — Suspected of causing cancer
- H410 — Very toxic to aquatic life with long lasting effects
Customs & Trade Information
| HS Code | 2907221000 |
|---|---|
| Summary | 2907221000 hydroquinone。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。Lowest tariff:5.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Hydroquinone?
The CAS number of Hydroquinone is 123-31-9.
What are the molecular formula and molecular weight of Hydroquinone?
Hydroquinone has molecular formula C6H6O2 and molecular weight 110.111 g/mol.
Is Hydroquinone hazardous?
Hydroquinone has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H317 — May cause an allergic skin reaction; H318 — Causes serious eye damage.
What are the upstream and downstream products of Hydroquinone?
For Hydroquinone, Upstream Products: 4-Bromophenol, 1,4-Benzoquinone, 1,4-Dimethoxybenzene; Downstream Products: Geroquinol, 1,4-Bis(2-ethylhexyloxy)benzene, 2-Ethylhexanol.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Hydroquinone (CAS 123-31-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-965975-1 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.