8.22333 EMD Millipore


Hydroquinone for synthesis. CAS 123-31-9, EC Number 204-617-8, chemical formula C₆H₄(OH)₂., for synthesis

Synonym: 1,4-Dihydroxybenzene, Quinol

  • CAS Number 123-31-9

  • Linear Formula C₆H₆O₂

  • Molecular Weight 110.11 g/mol

  •  EC Number 204-617-8



Related Categories Biochemicals and Reagents More...
packaging   25 kg in Fibre carton (8223339025)
  250 g in Plastic bottle (8223330250)
bp   287 °C (1013 hPa)
vapor pressure   <0.1 hPa (25 °C)
solubility   70 g/l
density   1.358 g/cm3 (20 °C)
flash point   165 °C
autoignition temp.   515 °C
mp   172 °C (decomposition)
bulk density   600 kg/m3
LD 50 oral   LD50 Rat 302 mg/kg
shipped in   ambient
storage temp.   Store below +30°C.

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Safety Information

HS Code 
2907 22 00
Hazard Statement(s) 
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.
H400: Very toxic to aquatic life.
Precautionary Statement(s) 
P273: Avoid release to the environment.
P280: Wear protective gloves.
P280: Wear eye protection.
P302 + P352: IF ON SKIN: Wash with plenty of soap and water.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P313: Get medical advice/ attention.
Storage class 
10 - 13 Other liquids and solids
WGK 3 highly water endangering
Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.
Hazard Pictogram(s) 
GHS05  GHS05
Hazard Pictogram(s) 
GHS07  GHS07
Hazard Pictogram(s) 
GHS08  GHS08
Hazard Pictogram(s) 
GHS09  GHS09
Hazard Symbols 
Dangerous for the environment  Dangerous for the environment
Hazard Symbols 
Harmful  Harmful
Declaration (railroad and road) ADR, RID 
UN 3077 , 9, III
Declaration (transport by air) IATA-DGR 
UN 3077 , 9, III
Declaration (transport by sea) IMDG-Code 
UN 3077 , 9, III, Marine Pollutant: P
Categories of danger 
harmful, carcinogenic, irritant, sensitizing, mutagenic, dangerous for the environment
R Phrase 
R 22-40-41-43-68-50
Harmful if swallowed.Limited evidence of a carcinogenic effect.Risk of serious damage to eyes.May cause sensitisation by skin contact.Possible risk of irreversible effects.Very toxic to aquatic organisms.
S Phrase 
S 26-36/37/39-61
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear suitable protective clothing, gloves and eye/face protection.Avoid release to the environment. Refer to special instructions/ Safety data sheets.
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