Molekula
Hydroquinone
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 is a white crystalline solid used in organic synthesis, as a photographic developer, and in dermatological treatments for hyperpigmentation. It is a potent reducing agent and antioxidant. It is also widely used as a polymerization inhibitor for vinyl and acrylic monomers, a stabilizer for unsaturated polyester resins, and an intermediate for rubber antioxidants. Available in powder form with a CAS number of 123-31-9, molecular formula C6H4(OH)2, and molecular weight 110.11 g/mol. Store at ambient temperature. Hazardous: signal word Danger. Molekula supplies Hydroquinone 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
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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100 g — $41.80 per pack
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1 kg — $115.30 per pack
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 | 171.0°C - 174.0°C |
| Identification | Conforms to reference |
| Assay | ≥99.5% |
| Sulphated Ash | ≤0.0500% |
| Colour of Solution | ≤30 Hazen |
| Moisture | ≤0.60% |
| Heavy Metals (Pb) | ≤10 ppm |
| Iron (Fe) | ≤5 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 |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White crystals |
| Odour | Odorless |
| Melting Point | 172 °C |
| Boiling Point | 287 °C |
| Density | 1.3 (relative, water = 1) |
| Vapour Pressure | 0.12 Pa at 20 °C |
| Refractive Index | 1.632 |
| pKa | pKa = 10.85 |
| log P (octanol/water) | 0.59 |
Source: PubChem CID 785 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 18759645 |
| CAS Number | 123-31-9 |
| IUPAC Name | benzene-1,4-diol |
| EC Number | 204-617-8 |
| Molecular Formula | C6H4(OH)2 |
| Molecular Weight | 110.11 |
| Exact Mass | 110.0368 |
| SMILES | C1=CC(=CC=C1O)O |
| InChIKey | QIGBRXMKCJKVMJ-UHFFFAOYSA-N |
| InChI | InChI=1S/C6H6O2/c7-5-1-2-6(8)4-3-5/h1-4,7-8H |
| PubChem CID | 785 |
| UN Number | UN2811 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2907.22.5000 |
| Tariff Code | 2907220010 |
Safety & GHS
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Corrosive
GHS05
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Toxic
GHS06
-
Health Hazard
GHS07
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Serious Health Hazard
GHS08
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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
- 1,4-benzenediol
- 1,4-Dihydroxybenzene
- 4-Hydroxyphenol
- Benzene-1,4-diol
- hydroquinol
- p-Benzenediol
- p-Dihydroxybenzene
- p-Hydroquinone
- p-Hydroxyphenol
- Quinol
Frequently asked questions
What is hydroquinone used for?
Hydroquinone is primarily used in organic synthesis, as an antioxidant in rubber and plastics, and in pharmaceuticals for skin lightening treatments.
What is the chemical formula and molecular weight of hydroquinone?
The chemical formula is C6H4(OH)2 and the molecular weight is 110.11 g/mol.
How should hydroquinone be stored?
Hydroquinone should be stored at ambient temperature, protected from light and air to prevent oxidation.
What grade of hydroquinone does Molekula supply?
Molekula supplies hydroquinone in analytical grade, suitable for laboratory and industrial applications.
Can Molekula supply hydroquinone in bulk?
Yes, Molekula can supply hydroquinone in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with a hydroquinone order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS), compliant with regulatory standards.
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.