1. Product Information
Product name: Hydroquinone
CAS No.:123-31-9
EINECS No.:204-617-8Chemical Formula: C₆H₆O₂
Molecular Weight: 110.11
Synonyms:1,4-Benzenediol, 1,4-Dihydroxybenzene, Quinol, HQAppearance:White acicular crystal or crystalline powder.
Product Type: Aromatic phenolic compound, polymerization inhibitor, organic intermediate2. Physical & Chemical Properties
Density (15 °C) 1.33 g/cm³
Melting Point 172-175 °C
Boiling Point 285 °C (101.3 kPa)
Flash Point (Closed Cup) 165 °C
Solubility in Water 70 g/L (20 °C); soluble in ethanol, ether; slightly soluble in benzenelogP 0.59
Stability Sensitive to air and light, turns dark upon oxidation. Incompatible with strong oxidants and strong bases. Combustible solid
3. Quality Specification (Industrial / Photo Grade)
| Test Item | Specification |
|---|---|
| Assay | ≥99.0 % |
| Melting Point | ≥171.0 °C |
| Residue on ignition | ≤0.1 % |
| Moisture | ≤0.2 % |
4. Applications
Polymerization inhibitor: Prevent monomer polymerization during storage & transportation.
Photographic developer: Used for black‑and‑white film and X‑ray film processing.
Organic intermediate: For dyes, rubber antioxidant, pharmaceutical and pesticide synthesis.
Reducing agent: Analytical reagent, oxygen scavenger for boiler water treatment.
5. Packaging, Storage & Transportation
- Packaging: 25 kg woven bag / fiber drum.
- Storage: Keep tightly sealed. Store in cool, dry, dark warehouse. Avoid light, air exposure and oxidizing agents.
- Transport: Ordinary hazardous solid chemical. Prevent moisture and sunlight. UN 3077, Class 9.6. Safety Remarks (Refer to SDS for full details)
- Irritating to skin, eyes and respiratory tract. Wear protective goggles and chemical‑resistant gloves.
- In case of contact, rinse with plenty of clean water.
- Fire-extinguishing media: water spray, foam, dry powder, CO₂.
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