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Hydroquinone Structure


Chemical Properties

Melting point 172-175 °C(lit.)
Boiling point 285 °C(lit.)
Density  1.32
vapor density  3.81 (vs air)
vapor pressure  1 mm Hg ( 132 °C)
refractive index  1.6320
Flash point 165 °C
storage temp.  Store below +30°C.
solubility  H2O: 50 mg/mL, clear
form  Needle-Like Crystals or Crystalline Powder
pka 10.35(at 20℃)
color  White to off-white
Water Solubility  70 g/L (20 ºC)
Sensitive  Air & Light Sensitive
Merck  14,4808
BRN  605970
Henry's Law Constant (x 10-9 atm?m3/mol): <2.07 at 20 °C (approximate - calculated from water solubility and vapor pressure)
Exposure limits NIOSH REL: 15-min ceiling 2, IDLH 50; OSHA PEL: TWA 2; ACGIH TLV: TWA 2 (adopted).
Stability Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, oxygen, ferric salts. Light and air-sensitive. Discolours in air.
LogP 0.59 at 20℃
Indirect Additives used in Food Contact Substances HYDROQUINONE
FDA 21 CFR 175.105
CAS DataBase Reference 123-31-9(CAS DataBase Reference)
EWG's Food Scores 6-9
ATC code D11AX11
IARC 3 (Vol. 15, Sup 7, 71) 1999
NIST Chemistry Reference Hydroquinone(123-31-9)
EPA Substance Registry System Hydroquinone (123-31-9)


Signal wordDanger
Hazard statements H302-H318-H341-H351-H410
Precautionary statements P202-P273-P280-P301+P312-P305+P351+P338-P308+P313
Hazard Codes  Xn,N
Risk Statements  22-40-41-43-50-68-R68-R50-R43-R41-R40-R22
Safety Statements  26-36/37/39-61-S61-S36/37/39-S26
RIDADR  2662
WGK Germany  3
RTECS  MX3500000
Autoignition Temperature 930 °F
HazardClass  9
PackingGroup  III
HS Code  29072210
Hazardous Substances Data 123-31-9(Hazardous Substances Data)
Toxicity LD50 orally in rats: 320 mg/kg (Woodard)
IDLA 50 mg/m3
NFPA 704:
2 0

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