1324002

Hydroquinone

United States Pharmacopeia (USP) Reference Standard

• Synonym(s): 1,4-Benzenediol, 1,4-Dihydroxybenzene, HQ
• Linear Formula: C₆H₄-1,4-(OH)₂
• CAS Number: 123-31-9
• Molecular Weight: 110.11
• UNSPSC Code: 41116107
• NACRES: NA.24
• PubChem Substance ID: 329750111
• MDL number: MFCD00002339
• Beilstein/REAXYS Number: 605970
• eCl@ss: 25140904

Properties

• grade: pharmaceutical primary standard
• agency: USP
• vapor density: 3.81 (vs air)
• vapor pressure: 1 mmHg ( 132 °C)
• API family: hydroquinone
• autoignition temp.: 930 °F
• manufacturer/tradename: USP
• bp: 285 °C (lit.)
• mp: 172-175 °C (lit.)
• application(s): pharmaceutical (small molecule); pharmaceutical
• format: neat
• SMILES string: Oc1ccc(O)cc1
• InChI: 1S/C6H6O2/c7-5-1-2-6(8)4-3-5/h1-4,7-8H
• InChI key: QIGBRXMKCJKVMJ-UHFFFAOYSA-N

Description

General description

Find answers to frequently asked questions on USP products in USP FAQs.

This product is provided as delivered and specified by the issuing Pharmacopoeia. All information provided in support of this product, including SDS and any product information leaflets have been developed and issued under the Authority of the issuing Pharmacopoeia.For further information and support please go to the website of the issuing Pharmacopoeia.

Application

Hydroquinone USP reference standard, intended for use in specified quality tests and assays as specified in the USP compendia.
Also, for use with USP monographs such as:

• Hydroquinone Cream
• Hydroquinone Topical Solution

Analysis Note

These products are for test and assay use only. They are not meant for administration to humans or animals and cannot be used to diagnose, treat, or cure diseases of any kind.  ​

Other Notes

Sales restrictions may apply.

Safety Information

• Pictograms: GHS08,GHS05,GHS07,GHS09
• Signal Word: Danger
• Hazard Codes: H302,H317,H318,H341,H351,H410
• Precautionary Statements: P273 - P280 - P301 + P312 - P302 + P352 - P305 + P351 + P338 - P308 + P313
• Hazard Classifications: Acute Tox. 4 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 2 - Eye Dam. 1 - Muta. 2 - Skin Sens. 1B
• Storage Class: 11 - Combustible Solids
• Flash Point (°F): 329.0 °F - closed cup
• Flash Point (°C): 165 °C - closed cup