A4714612
Hydroquinone , standardforGC,≥99.5%(GC) , 123-31-9
Synonym(s):
1,4-Benzenediol;1,4-Dihydroxybenzene;1,4-Dihydroxybenzene, Quinol;HQ;Hydroquinone
CAS NO.：123-31-9
Empirical Formula: C6H6O2
Molecular Weight: 110.11
MDL number: MFCD00002339
EINECS: 204-617-8
Update time: 2022-07-08
PRODUCT 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 |
| pka | 10.35(at 20℃) |
| form | Needle-Like Crystals or Crystalline Powder |
| color | White to off-white |
| Odor | odorless |
| 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. |
| InChIKey | QIGBRXMKCJKVMJ-UHFFFAOYSA-N |
| LogP | 0.59 at 20℃ |
| CAS DataBase Reference | 123-31-9(CAS DataBase Reference) |
| IARC | 3 (Vol. 15, Sup 7, 71) 1999 |
| NIST Chemistry Reference | Hydroquinone(123-31-9) |
| EPA Substance Registry System | Hydroquinone (123-31-9) |
Description and Uses
Hydroquinone (HQ) is produced by the oxidation of aniline or phenol, by the reduction of quinone, or from a reaction of acetylene and carbon monoxide. Hydroquinone occurs naturally as a glucose ether, also known as arbutin, in the leaves of many plants and in fruits, as well as one of the agents used in the defense mechanism of the bombardier beetle, family Carabidae.
Use as photographic reducer and developer; as reagent in the determination of small quantities of phosphate; as antioxidant. Depigmentor
Safety
| Symbol(GHS) |     GHS05,GHS07,GHS08,GHS09 |
| Signal word | Danger |
| 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 |
| OEL | Ceiling: 2 mg/m3 [15-minute] |
| WGK Germany | 3 |
| RTECS | MX3500000 |
| Autoignition Temperature | 930 °F |
| TSCA | Yes |
| 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 |
