Paraformaldehyde
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
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 and air. Its aqueous solution turns brown when oxidized in air, with accelerated oxidation under alkaline conditions. Melting point ranges 170–171°C, boiling point 285–287°C, relative density 1.33215, and UV λmax 288 nm in water. It dissolves readily in hot water, ethanol, and diethyl ether, while being slightly soluble in benzene. It exhibits high chemical reactivity, is prone to oxidation, and can undergo esterification and substitution 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 | Value |
| Hazard Codes | Xn,N |
| Risk Statements | 22-40-41-43-50-68 |
| Safety Statements | 26-36/37/39-61 |
| 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) |
| IDLH | 50 mg/m3 |
Product Application of Hydroquinone CAS#123-31-9
Used for colorimetric analysis of phosphorus, magnesium, niobium, copper, silicon, and arsenic; polarographic and volumetric measurement of iridium; reducing agent for heteropoly acids, copper, and gold; detection of phosphate, tungstate, nitrate, nitrite, selenium, and tellurium; photographic developer; antioxidant; fertilizer desulfurizer; urea synergist.
Delivery time
Inventory orders: 2–3 working days
New production: 7–10 working days
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