CAS No. 123-31-9

Appearance	White crystal powder
Content（ %)	≥ 99-101
Melting point(℃ )	171-175
Residue after ignition(%)	≤ 0.05
Fe(%)	≤ 0.002
Pb(%)	≤ 0.002
Standard	technical grade
Content	99%
Capacity	50MT/month
Loading port	Shanghai
Package	25kg/bag or 25kg/drum or as according to the customers'demand
Storage	Stored in the dry and ventilated inside storeroom, prevent direct sunlight, slightly pile and put down

Product Name: Hydroquinone
Synonyms: 1,4-Benzenediol (hydroquinone);
1,4-Dihydroxy-benzeen;
1,4-Dihydroxybenzen;
1,4-Dihydroxy-benzol;
1,4-Diidrobenzene;
4-Hydroxyphenol;
alpha-hydroquinone
CAS: 123-31-9

Product Categories: Intermediates of Dyes and Pigments;
Redox Catalysts (Environmentally-friendly Oxidation);Environmentally-friendly Oxidation;
Synthetic Organic Chemistry;Aromatics;Building Blocks;Chemical Synthesis;
Nutrition Research;Organic Building Blocks;Oxygen Compounds;
Phytochemicals by Plant (Food/Spice/Herb);

Hydroquinone Chemical Properties
mp 172-175 °C(lit.)
bp 285 °C(lit.)
density 1.32
vapor density 3.81 (vs air
vapor pressure 1 mm Hg ( 132 °C)
Fp 165 °C
storage temp. Refrigerator
solubility H2O: 50 mg/mL, clear

Water Solubility 70 g/L (20 ºC)
Merck 14,4808
Stability: Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, oxygen, ferric salts. Light and air-sensitive. Discolours in air.

Safety Information
Hazard Codes Xn,N
Risk Statements 22-40-41-43-50-68
Safety Statements 26-36/37/39-61-like crystals or crystalline powder

Usage Use as photographic reducer and developer; as reagent in the determination of small quantities of phosphate; as antioxidant. Depigmentor
General Description Light colored crystals or solutions. May irritate the skin, eyes and mucous membranes. Mildly toxic by ingestion or skin absorption.
Air & Water Reactions Darkens on exposure to air and light. Miscible in water. Solutions become brown in air due to oxidation. Oxidation is very rapid in the presence of alkali.

Molecular Formula: C6H6O2
Molecular Weight: 110.11
Hazard Symbols: Xn,N
UN Number: 2662
WGKGermany: 3
PackingGroup: III
HS Code: 29072210

Appearance	White to off-white crystalline powder
Assay	98.0% min
Ignition residue	0.3% max
Melting point	212.0℃ min
Loss on drying	0.5% max

Purity: 99,0%

Assay, % max. 99.00~101.00

Melting point, ℃ 171.00~175.00

Residue on ignition, % ≤ 0.05

Fe, % ≤ 0.002

Pb, % ≤ 0.001

Solution appearance Transparent without insoluble substance

Alternative name	Hydrochinon
Further description	Hydrochinonum
Monograph	DAC/NRF 2013/2
Pharmaceutical status	pharmacy-only (conditionally)
INCI	Hydroquinone
UEXDES	Chemicals solid

Appearance	White acicular crystal or crystal powder
Content	99.00～ 100.50%
Melting point	171～ 175℃
Iron (Fe)	≤ 0.002%
Heavy metals (as Pb)	≤ 0.002%
Residue after ignition	≤ 0.100%
Conclusion	The results conforms with GB/T23959-2009 standards