Safety data for hydroquinone
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Toxicity data
Risk phrases
Safety phrases
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This information was last updated on November 1, 2006.
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for it. General
Synonyms: alpha-hydroquinone, hydroquinol, quinol, benzoquinol, p-benzenediol, 1,4-benzenediol,
p-dihydroxybenzene, p-hydroxyphenol, p-dioxobenzene, 1,4-dihydroxybenzene,
dihydroquinone, pyrogentistic acid, quinnone, aida,
arctuvin, eldoquin, eldopaque, phiaquin, tecquinol, tenox HQ, tequinol
Molecular formula: C6H6O2
CAS No: 123-31-9
EINECS No: 204-617-8
Physical data
Appearance: off-white powder or white needle-like crystals
Melting point: 172 - 175 C
Boiling point: 285 C
Vapour density: 3.81 (air = 1)
Vapour pressure: 1 mm Hg at 132 C
Density (g cm-3): 1.33
Flash point: 165 C
Explosion limits:
Autoignition temperature: 498 C
Water solubility: moderate
Stability
Stable. Combustible. Incompatible with strong
oxidizing agents, strong bases, oxygen, ferric salts. Light and air-sensitive.
Discolours in air.
Toxicology
Possible carcinogen.
Severe skin irritant; allergen.
Harmful by inhalation and ingestion. May cause sensitization.
Eye and respiratory irritant.
(The meaning of any abbreviations which appear in this
section is given
here.)
ORL-HMN LDLO 29 mg kg-1
ORL-RAT LD50 320 mg kg-1
IPR-RBT LD50 125 mg kg-1
SKN-MAM LD50 5970 mg kg-1
ORL-DOG LD50 200 mg kg-1
SCU-RAT LD50 300 mg kg-1
(The meaning of any risk phrases which appear in this section is given
here.)
R20 R22 R50 R53. Environmental information
Very toxic to aquatic organisms - may cause long-term harm in the environment.
Transport information
(The meaning of any UN hazard codes which appear in this section
is given
here.)
UN No 2662. Hazard class: 6.1. Packing group: III Personal protection
Safety glasses, gloves, adequate ventilation. Treat as a
potential carcinogen.
(The meaning of any safety phrases which appear in this section is
given here.)
S24 S25 S39.