HYDROQUINONE

PRODUCT IDENTIFICATION
CAS NO. 123-31-9

HYDROQUINONE

EINECS NO. 204-617-8
FORMULA C6H4(OH)2
MOL WT. 110.11
H.S. CODE 2907.29

TOXICITY

 Oral rat LD50: 320 mg/kg
SYNONYMS 1,4-Dihydroxybenzene; p-Dihydroxybenzene; 1,4-Benzenediol;
Quinol; 1,4-benzenediol; p Benzendiol; Benzoquinol; 1,4-Hydroxybenzene; p-Hydroquinone; p-Dihydroxybenzene; 1,4-Benzendil; Aida; Black and White Bleaching Cream; Eldoquin; Elopaque; quinnone; 1, 4-dihydroxy-benzeen (Dutch); 1,4-Dihydroxybenzen (Czech); 1,4-Dihydroxy-benzol (German); 1,4- Diidrobenzene (Italian); Hydrochinon (Czech, Polish); Idrochinone (Italian); 对苯二酚 (Chinese); 对苯二酚又名氢醌(Chinese); Hidroquinoa (Spanish);

SMILES

 c1(ccc(cc1)O)O

CLASSIFICATION

Dihydroxybenzene, Antioxidant

EXTRA NOTES

Hydroquinone (HQ) is a high-volume commodity chemical used as a reducing agent, antioxidant, polymerization inhibitor, and chemical intermediate. It is also used in over-the-counter (OTC) drugs as an ingredient in skin lighteners and is a natural ingredient in many plant-derived products, including vegetables, fruits, grains, coffee, tea, beer, and wine. [HSDB]
Overall Carcinogenic Evaluation: Group 3
Other RN: 8027-02-9, 57534-13-1

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

light tan, light gray or colorless crystalline solid

MELTING POINT 170 C
BOILING POINT

285 C
SPECIFIC GRAVITY 1.33
SOLUBILITY IN WATER 7g/100g
pH

 
VAPOR DENSITY 3.81

NFPA RATINGS

 Health: 3 Flammability: 1 Reactivity: 0

REFRACTIVE INDEX

 
FLASH POINT

165 C

STABILITY

Stable under ordinary conditions. But this chemical darkens on exposure to air and light

EXTERNAL LINKS & GENERAL DESCRIPTION

USA.gov - Hydroquinone

Wikipedia Linking - Hydroquinone

Google Scholar Search - Hydroquinone

U.S. National Library of Medicine - Hydroquinone

PubChem Compound Summary - Hydroquinone

IPCS INCHEM -  Hydroquinone

KEGG (Kyoto Encyclopedia of Genes and Genomes) -  Hydroquinone

http://www.ebi.ac.uk/chebi/ -  Hydroquinone

http://www.ncbi.nlm.nih.gov/ -  Hydroquinone

Material Safety Data Sheet - Hydroquinone

Hazardous Substances Data Bank - Hydroquinone

EPA - Substance Registry Services - Hydroquinone

Local:
GENERAL DESCRIPTION OF DIHYDROXYBENZENE: There are three isomeric compounds of dihydroxybenzene molecule structure, which all have traditional names respectively. The ortho (1,2) isomer is called catechol (Also known as catechin; pyrocatechol; pyrocatechuic acid), which forms clear crystals used as a photographic developer in solution and as a starting material to produce synthetic catecholamines which have important physiological effects as neurotransmitters and hormonesany (such as epinephrine, adrenaline, norepinephrine, and dopamine). The meta (1,3) isomer is resorcinol (also known as resorcin), which forms clear needle crystals used in the production of diazo dyes and plasticizers. It is produced by sulfonating benzene with fuming sulfuric acid and fusing the resulting benzenedisulfonic acid with caustic soda. Resorcinol is used in resins as an UV absorber. It is used in manufacturing fluorescent and leather dyes and adhesives. Reaction with formaldehyde produces resins( (resorcinol formaldehyde resins) used to make rayon and nylon. It is used as a pharmaceutical to treat acne and other greasy skin conditions in combination with other acne treatments such as sulfur. It is used as an anti-dandruff agent in shampoo and sunscreen cosmetics. It is also used as a chemical intermediate to synthesis pharmaceuticals and other organic compounds. The para (1,4) isomer is hydroquinone (also known as quinol), which forms clear prisms used as a photographic reducer and developer (except in color film). It is formed in large quantities by chemical reduction of benzoquinone. This compound is a general-purpose inhibitor, stabilizer, antioxidant, and intermediate. One of the major uses of hydroquinone is as an intermediate to make other inhibitors, stabilizers, antioxidants, agricultural chemicals, and dyes.

APPLICATIONS OF HYDROQUINONE: This compound is a good general-purpose inhibitor, stabilizer, antioxidant, and intermediate. It is used as a photographic reducer and developer (except in color film). One of the major uses for hydroquinone is an intermediate to make other inhibitors, stabilizers, antioxidants, agricultural chemicals, and dyes.

 
SALES SPECIFICATION

APPEARANCE

light tan, light gray or colorless crystalline solid
ASSAY

99.5% min

MELTING POINT

171 - 175 C

ASH

0.04% max

HEAVY METALS

10ppm max

IRON

10ppm max

WATER

0.1% max

TECH GRADE

ASSAY

99.0% min

MELTING POINT

169.5 C min

LOSS ON DRYING

0.3% max

ASH

0.3% MAX
TRANSPORTATION
PACKING  
HAZARD CLASS 6.1
UN NO. 2662
SAFETY INFORMATION

HAZARD OVERVIEW

GHS (Globally Harmonised System) Classification: Acute toxicity (Oral). Skin irritation. Serious eye damage. Skin sensitization. Germ cell mutagenicity. Carcinogenicity. Acute aquatic toxicity. Hazard statements: Harmful if swallowed. Causes skin irritation. May cause an allergic skin reaction. Causes serious eye damage. Suspected of causing genetic defects. Suspected of causing cancer. Very toxic to aquatic life.

GHS

 
SIGNAL WORD

Danger

PICTOGRAMS

HAZARD STATEMENTS

H302-H315-H317-H318-H341-H351-H400

P STATEMENTS

P273-P280-P305 + P351 + P338 

EC DIRECTIVES

 
HAZARD CODES

RISK PHRASES

22-40-41-43-50-68

SAFETY PHRASES

26-36/37/39-61

PRICE INFORMATION