Free lookupCAS 123-31-9

Hydroquinone

CAS 123-31-9 · PubChem CID 785 · C6H6O2 · 110.11 g/mol

Also called hydroquinone, Benzene-1,4-diol, 1,4-benzenediol, 1,4-Dihydroxybenzene, Quinol.

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Opens the builder with Hydroquinone loaded
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01GHS classification

Corrosive

Irritant

Health Hazard

Environmental Hazard

Signal word

Danger

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

Precautionary statement codes

P203, P261, P264, P264+P265, P270, P272, P273, P280, P301+P317, P302+P352, P305+P354+P338, P317, P318, P321, P330, P333+P317, P362+P364, P391, P405, and P501

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H302Harmful if swallowed

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H317May cause an allergic skin reaction

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H318Causes serious eye damage

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H341Suspected of causing genetic defects

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H351Suspected of causing cancer

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

H400Very toxic to aquatic life

Regulation (EC) No 1272/2008 of the European Parliament and of the Council — fetched 2026-08-28

02Physical and chemical properties

Appearance

Colourless crystals.

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Odour

Odorless

Hazardous Substances Data Bank (HSDB) — fetched 2026-08-28

Melting point

172 °C

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Boiling point

287 °C

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Flash point

165 °C

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Auto-ignition temperature

515 °C

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Flammable limits

Combustible Solid; dust cloud may explode if ignited in an enclosed area.

The National Institute for Occupational Safety and Health (NIOSH) — fetched 2026-08-28

Vapour pressure

Vapor pressure, Pa at 20 °C: 0.12

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Relative density

Relative density (water = 1): 1.3

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Solubility in water

Solubility in water, g/100ml at 15 °C: 5.9

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Partition coefficient, log Kow

0.59

ILO-WHO International Chemical Safety Cards (ICSCs) — fetched 2026-08-28

Viscosity

no value printed

unsourced — inference candidate

03Toxicological information

No published acute toxicity value was found for this substance in the sources we read. On a document, Section 11 would print unsourced — inference candidate rather than an estimate.

This page is the evidence. The document is the deliverable.

Everything above is free and stays free. For $5 the same sourced values are assembled into a 16-section safety data sheet and a print-ready GHS label carrying your company details in Section 1.

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What we read

Regulation (EC) No 1272/2008 of the European Parliament and of the Council, Hazardous Substances Data Bank (HSDB), ILO-WHO International Chemical Safety Cards (ICSCs), The National Institute for Occupational Safety and Health (NIOSH).

21 sourced records for this substance are in the ledger. Values dated more than 30 days ago are re-fetched on the next document.

04Also in the ledger

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