Molekula
4-Hydroxy-2-methylbenzenesulfonic acid hydrate
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
4-Hydroxy-2-methylbenzenesulfonic acid hydrate is an organic sulfonic acid derivative used primarily as a precursor in pharmaceutical synthesis, dye manufacturing, and as a reagent in chemical research. It appears as a white to off-white crystalline solid, soluble in water and polar organic solvents. This chemical has a CAS number of 7134-05-6, with the molecular formula CH3C6H3(OH)SO3H · H2O and a molecular weight of 188.20. It is stored at ambient conditions and carries a **Danger** signal word due to its hazardous properties. Molekula supplies 4-Hydroxy-2-methylbenzenesulfonic acid hydrate 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.
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Specifications
| Property | Value |
|---|---|
| Appearance | Brown to dark brown solid |
| Water | Report results |
| MS | Conforms to Structure |
| Elemental Analysis | Conforms to Structure |
| Identification (NMR) | Conforms to Structure |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | III |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90034807 |
| CAS Number | 7134-05-6 |
| IUPAC Name | 4-hydroxy-2-methylbenzenesulfonic acid |
| EC Number | 230-433-2 |
| Molecular Formula | CH3C6H3(OH)SO3H . H2O |
| Molecular Weight | 188.20 |
| Exact Mass | 188.0143 |
| SMILES | CC1=C(C=CC(=C1)O)S(=O)(=O)O |
| InChIKey | PYPXOMYXFFYJIF-UHFFFAOYSA-N |
| InChI | InChI=1S/C7H8O4S/c1-5-4-6(8)2-3-7(5)12(9,10)11/h2-4,8H,1H3,(H,9,10,11) |
| PubChem CID | 81554 |
| UN Number | UN1759 |
| REACH Code | Y110 |
| HTS Code | 2908999000 |
| Tariff Code | 2908990000 |
Safety & GHS
-
Corrosive
GHS05
-
Health Hazard
GHS07
Hazard statements
- H302 Harmful if swallowed
- H314 Causes severe skin burns and eye damage
- H335 May cause respiratory irritation
- H412 Harmful to aquatic life with long lasting effects
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.
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
- 4-hydroxy-2-methylbenzene-1-sulfonic acid
- 4-hydroxy-2-methylbenzenesulfonic acid
- 4-HYDROXY-O-TOLUENESULFONIC ACID
- 4-Hydroxy-o-toluenesulfonic Acid Hydrate;
- 5-Hydroxytoluene-2-sulphonic acid
- Benzenesulfonic acid, 4-hydroxy-2-methyl-
- METACRESOL-4-SULFONIC ACID
- o-Toluenesulfonic acid, 4-hydroxy-
- PYPXOMYXFFYJIF-UHFFFAOYSA-N
Frequently asked questions
What is 4-Hydroxy-2-methylbenzenesulfonic acid hydrate commonly used for?
It is primarily used as an intermediate in the synthesis of dyes, pharmaceuticals, and agrochemicals, as well as in the production of sulfonic acid-based surfactants.
What is the chemical formula and molecular weight of this compound?
The formula is **CH₃C₆H₃(OH)SO₃H · H₂O**, and the molecular weight is **188.20 g/mol**.
How should this chemical be stored?
Store in a tightly sealed container at **ambient temperature**, away from moisture and incompatible substances.
What purity grades are available for this product?
Molekula supplies this compound in **technical grade (95%+ purity)** and **analytical grade (98%+ purity)**.
Can Molekula supply this product in bulk quantities?
Yes, we offer bulk packaging options, including drums and IBCs, for orders meeting minimum quantity requirements.
What documentation is provided with each order of this chemical?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and **batch-specific 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.