C6H6O2
110.11 g/mol
Industrial ChemicalDanger
Hydroquinone
CAS123-31-9EC204-617-8
Category
Industrial Chemical
Compound Class
Aromatic
Primary Use
photographic developer and polymerization inhibitor
Hydroquinone is a chemical compound that appears as light-colored crystals or solutions. It is primarily known for its role as a developing agent in black-and-white photography and as an inhibitor of polymerization in industrial monomers.
Developing agent in black-and-white photography, lithography, and X-ray filmsPolymerization inhibitor for vinyl monomers and unsaturated polyester resinsIntermediate for producing antioxidants for rubber and food
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
SimilarStructure SimilarSimilarity 0.73
4,4'-biphenyldiol
CAS92-88-6
monomer for plastic production
ReferenceSame Category
Glyceryl allyl ether
CAS123-34-2
Cosmetic ingredient and chemical intermediate
ReferenceSame Category
Propionaldehyde
CAS123-38-6
Manufacture of plastics and rubber chemicals
ReferenceSame Category
Choline hydroxide
CAS123-41-1
Structure directing agent
ReferenceSame Category
Diacetone alcohol
CAS123-42-2
Solvent for cellulose acetate and resins
Safety Reference
Danger
H302Harmful if swallowed
H317May cause an allergic skin reaction
H318Causes serious eye damage
H341Suspected of causing genetic defects
H351Suspected of causing cancer
H400Very toxic to aquatic life
H312Harmful in contact with skin
H410Very toxic to aquatic life with long lasting effects
H340May cause genetic defects
H370Causes damage to organs
H373May cause damage to organs through prolonged or repeated exposure
H316Causes mild skin irritation
H336May cause drowsiness or dizziness
H315Causes skin irritation
H319Causes serious eye irritation
H360May damage fertility or the unborn child
H372Causes damage to organs through prolonged or repeated exposure
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for Hydroquinone (CAS 123-31-9) is 2907.22.
HS code (international, 6-digit)
2907.22
EU CN code (8-digit)
2907 22 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
benzene-1,4-diol
InChIKey
QIGBRXMKCJKVMJ-UHFFFAOYSA-N
SMILES
C1=CC(=CC=C1O)O
Synonyms (186)
- HQE
- HYDROP
- PIONA
- PLQ
- Etamsylate EP Impurity A; Hydroquinone
- Hydroquinone (USP)
- Hydroquinone, USP, 99.0-100.5%
- Hydroquinone, United States Pharmacopeia (USP)
- Hydroquinone, meets USP testing specifications
- 1,4-Dihydrobenzoquinone
- 1,4-Dihydroxy-benzeen
- 1,4-Dihydroxy-benzeen [Dutch]
- 1,4-Dihydroxy-benzol
- 1,4-Dihydroxy-benzol [German]
- 1,4-Dihydroxybenzen
- 1,4-Dihydroxybenzen [Czech]
- 1,4-Dihydroxybenzene
- 1,4-Dihydroxybenzene Quinol
- 1,4-Dihydroxybenzene, XIII
- 1,4-Diidrobenzene
- 1,4-Diidrobenzene [Italian]
- 1,4-Hydroxybenzene
- 1,4-benzenediol
- 141010 HYDROQUINONE
- 141011 HYDROQUINONE
- 141030 HYDROQUINONE
- 141055 HYDROQUINONE
- 141067 HYDROQUINONE
- 4-Benzenediol
- 4-DIHYDROXYBENZENE
- 4-Hydroxyphenol
- 4-hydroxyphenyl alcohol
- 4e3h
- Advanced Dual Complex Fade
- African Formula Black
- African Formula Carrot
- Arctuvin
- Artra
- Artra (Salt/Mix)
- Balancer
- Benzene, p-dihydroxy-
- Benzene-1,4-diol
- Benzohydroquinone
- Benzoquinol
- Black & White Bleaching Cream
- Body Fade Creme
- Brighten Lightening
- CONDITION AND ENHANCE BLENDER
- CONDITION AND ENHANCE CLEAR
- Caro Light
- Clear Action
- Dark Spot Lightening Cream
- Derma-Blanch
- Dermaclair Skin Lightening
- Diak 5
- Dihydroquinone
- Dihydroxybenzene
- Double White
- ELDOQUIN (TN)
- Eldopacque
- Eldopaque
- Eldopaque Forte
- Eldoquin
- Eldoquin Forte
- Epiquin
- Essential Fade Complex
- Exence White
- Gold Cosmetics Adi Clear
- Gold Cosmetics Bleach Cream
- HE 5
- HQ Plus Brightening Cream
- HYDROQUINONE [MART.]
- Hidroquinone
- Hot Movate
- Hydro-Q
- Hydrochinon
- Hydrochinon [Czech, Polish]
- Hydrochinone
- Hydroquinole
- Hydroquinone cream
- Hydroquinone gel
- Hydroquinone, HQ
- Hydroquinone, SAJ first grade
- Hydroquinone, puriss.
- Hydroquinoue
- I-max Lightening 5
- I-max Lightening L
- Idole Black
- Idole Carrot
- Idole Skin Lightening
- Idrochinone
- Idrochinone [Italian]
- Image Md Lightening Rx
- Light The Way
- Medisilke
- Medisilke Night
- Melanex
- Miracle Fade
- Movate Carrot
- Movate Lemon
- NU-DERM BLENDER
- NU-DERM CLEAR
- Neova Complex Hq Plus
- OLIVIA QUIDO BLEMISH ERASER
- Obagi-C
- PLUS Skin lightening Cream
- Phiaquin
- Pure Valley Miracle Age Spot
- Pyrogentistic acid
- Quinol
- Rejuvaderm Medispa Fading
- SYMBA Skin Lightening
- Scarlight Md
- Skin Beautifying Milk
- Skin Lightener
- Skin Lightening
- Skin Lightening Complex
- Skin Lightening Rodan Fields
- Skin lightening Cream
- Solaquin forte
- Sunvanish
- Supermax
- Tecquinol
- Tenox HQ
- Tequinol
- Topiclear Carrot
- Topiclear Paris
- Topiclear Skin Lightening
- Ultra Glow Fade
- Usaf ek-356
- Vivant True Tone
- Vivant True Tone Forte
- Vividly Brilliant Perfecting
- a-Hydroquinone
- alpha-hydroquinone
- b-Quinol
- beta-quinol
- hydroquinol
- hydroquinon
- hydroquinone
- hydroquinone for synthesis
- hydroquinone gr
- p Benzendiol
- p-Benzenediol
- p-Dihydroquinone
- p-Dihydroxybenzene
- p-Dioxobenzene
- p-Dioxybenzene
- p-Hydroquinone
- p-Hydroxybenzene
- p-Hydroxyphenol
- para-Dihydroxybenzene
- para-Dioxybenzene
- para-Hydroquinone
- para-Hydroxyphenol
- phenol derivative, 4
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