Molekula
Hydroquinone USP Specification
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Hydroquinone USP is a white crystalline organic compound with the formula C6H4(OH)2, primarily used as a skin-lightening agent in cosmetics, a photographic developer, and an antioxidant in industrial applications. It meets USP (United States Pharmacopeia) standards for pharmaceutical and cosmetic use. CAS 123-31-9, molecular weight 110.11, stored at ambient conditions. Classified as a **Danger** signal word substance under GHS. Molekula supplies Hydroquinone USP from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White solid |
| Melting Point | 172 - 174 °C |
| Assay | 99.0 - 100.5 % (anhydrous basis) |
| Sulphated Ash | ≤0.0500% |
| Colour of Solution | ≤30 Hazen |
| Residue on Ignition | ≤0.5% |
| Moisture | ≤0.5% |
| Heavy Metals (Pb) | ≤10 ppm |
| Appearance of 5 % solution (H2O) | Clear to very slightly cloudy |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 165 °C |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90030925 |
| CAS Number | 123-31-9 |
| Molecular Formula | C6H4(OH)2 |
| Molecular Weight | 110.11 |
| SMILES | C1=CC(=CC=C1O)O |
| UN Number | UN2811 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2907.22.5000 |
| Tariff Code | 2907220010 |
Safety & GHS
-
Corrosive
GHS05
-
Toxic
GHS06
-
Health Hazard
GHS07
-
Serious Health Hazard
GHS08
-
Hazardous to the Environment
GHS09
Hazard statements
- H301 Toxic if swallowed
- H317 May cause an allergic skin reaction
- H318 Causes serious eye damage
- H341 Suspected of causing genetic defects
- H351 Suspected of causing cancer
- H400 Very toxic to aquatic life
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
No alternate names recorded for this product.
Frequently asked questions
What is Hydroquinone USP Specification commonly used for?
Hydroquinone USP is primarily used in pharmaceuticals as a skin-lightening agent in depigmenting creams, as well as in hair dyes and as a preservative in some formulations.
What is the chemical formula and molecular weight of Hydroquinone USP?
The chemical formula is **C6H4(OH)2**, and the molecular weight is **110.11 g/mol**.
How should Hydroquinone USP be stored?
Store in a tightly sealed container at **ambient temperature**, away from direct sunlight and moisture.
What grade of Hydroquinone is available from Molekula?
Molekula supplies **USP-grade Hydroquinone**, meeting United States Pharmacopeia standards for pharmaceutical applications.
Can Molekula supply Hydroquinone USP in bulk quantities?
Yes, bulk quantities of Hydroquinone USP are available upon request—please contact our sales team for pricing and minimum order quantities.
What documentation comes with an order of Hydroquinone USP?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and **USP compliance documentation** for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.