Hydroquinone
1-4-Dihydroxybenzene, Quinol
- CAS
- 123-31-9
- EC
- 204-617-8
- Sectors
- Plastics & Polymers, Rubber & Elastomers, Coatings, Adhesives, Sealants & Elastomers
Hydroquinone (CAS 123-31-9), also known as 1-4-dihydroxybenzene, is an industrial aromatic compound with strong reducing properties, supplied as white needle-like crystals or crystalline powder, and is used as a polymerization inhibitor in vinyl monomers and resins, in antioxidant systems, in rubber processing and in coatings and adhesives. It is produced through controlled chemical synthesis to ensure high purity and stable performance in demanding manufacturing environments. The material dissolves readily in water and common solvents and is valued for its reliability in formulations that require precise oxidation control or polymer stabilisation.
Typical Properties
| Molecular formula | C6H6O2 |
|---|---|
| Molecular weight | 110.11 g/mol |
| Appearance | white needle-like crystals or crystalline powder |
| Form | Needle-Like Crystals or Crystalline Powder |
| Color | White to off-white |
| Odor | odorless |
| Melting point | 170-171 °C |
| Boiling point | 285-287 °C |
| Density | 1.332 g/cm³ |
| Water solubility | 70 g/L (20 °C) |
| Flash point | 165 °C |
| GHS signal word | Danger · Corrosive, Irritant / harmful, Health hazard, Environmental hazard |
| HS code | 29072200 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Hydroquinone
Applications
Used widely as a polymerisation inhibitor in the production of vinyl monomers and resins, in photographic processing solutions, in antioxidant systems for industrial formulations, in rubber processing, in dyes and pigment intermediates, and in speciality chemical synthesis where controlled reduction is required. Technical grades are also used in coatings, adhesives and electronic materials.
Safety & Risks
Irritant substance that may affect skin, eyes and respiratory system. Avoid prolonged contact. Handle with PPE and good ventilation. Sensitive to light and air which can cause gradual degradation.
Packaging
Supplied in 25 kilogram fibre drums or HDPE containers with inner liners. Store in cool, dry and dark conditions away from oxidants and sources of heat in accordance with SDS guidance.