Hydroquinone
CAS Number: 123-31-9
Chemical Formula: C6H6O2
Synonyms: HYDROXYQUINOL, HYDROCHINONE, Melanex
Appearance: White powder
HS Code: 2907221000
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Products Description of Hydroquinone CAS#123-31-9
Hydroquinone, also known as 1,4-benzenediol, has a molecular formula of C6H6O2 and a molecular weight of 110.11. It appears as colorless or white crystals and tends to discolor upon exposure to light in air. Its aqueous solution oxidizes to brown in air, with faster oxidation under alkaline conditions. It has a melting point of 170–171°C, boiling point of 285–287°C, and relative density of 1.33215. Its UV maximum absorption wavelength in water is 288 nm. It dissolves readily in hot water, ethanol, and diethyl ether, and is slightly soluble in benzene. It exhibits active chemical properties and is prone to oxidation, and can undergo esterification, substitution, and other reactions.
Parameters
| Parameter | Value |
| 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 |
| Fp | 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) |
| NIST Chemistry Reference | Hydroquinone(123-31-9) |
| IARC | 3 (Vol. 15, Sup 7, 71) 1999 |
| EPA Substance Registry System | Hydroquinone (123-31-9) |
Safety Information
| Item | Details |
| 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 |
| 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 |
Product Application of Hydroquinone CAS#123-31-9
Used for colorimetric determination of phosphorus, magnesium, niobium, copper, silicon, and arsenic; for polarographic and volumetric analysis of iridium; as a reducing agent for heteropolyacids, copper, and gold; for detection of phosphate, tungstate, nitrate, nitrite, selenium, and tellurium; as a photographic developer, antioxidant, fertilizer desulfurizer, and urea synergist.
Factory and Equipment Show
Delivery time
Inventory: 2–3 working days; New production: 7–10 working days
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