Unilong Industry Co.,Ltd.


Hydroquinone with CAS 123-31-9

COA123-31-9 1,4-dihydroxybenzene, also known as hydroquinone, is an important chemical raw material. Its appearance is white acicular crystal. 1,4-dihydroxybenzene is widely used as an important raw material, intermediate and auxiliary agent for medicine, pesticides, dyes and rubber. It is mainly used as developer, anthraquinone dye, azo dye, rubber antioxidant and monomer polymerization inhibitor, food stabilizer and coating antioxidant, petroleum anticoagulant, synthetic ammonia catalyst, etc. It can also be used as analytical reagent, reducing agent and developer of copper and gold.

1.Quick detals:

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

form Needle-Like Crystals or Crystalline Powder

pka 10.35(at 20℃)

color White to off-white

Water Solubility 70 g/L (20 ºC)

Sensitive Air & Light Sensitive

Merck 14,4808

BRN 605970


2. Description:

Product Name: Hydroquinone Batch No. JL20211025
Cas 123-31-9 MF Date OCT.25,2021
Packing 25KGS/BAG Analysis Date OCT.25,2021
Quantity 5MT Expiry Date OCT.24,2023
Item Standard Result



White crystalline powder




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3. Application: 

hydroquinone is a pigment-lightening agent used in bleaching creams. Hydroquinone combines with oxygen very rapidly and becomes brown when exposed to air. Although it occurs naturally, the synthetic version is the one commonly used in cosmetics. Application to the skin may cause allergic reaction and increase skin sun sensitivity. Hydroquinone is potentially carcinogenic and is associated with causing ochronosis, a discoloration of the skin. The u.S. FDA has banned hydroquinone from oTC cosmetic formulations, but allows 4 percent in prescription products.

4. Package