Description

o-Cresolsulfonic Acid is a versatile aromatic sulfonic acid derivative, primarily valued for its strong acidity and solubility in organic media. This compound serves as a critical intermediate and catalyst in the synthesis of fine chemicals, dyes, and specialty polymers. It is essential for manufacturers and R&D laboratories in the pharmaceutical, agrochemical, and polymer industries seeking a reactive and soluble acidic reagent.

Application

• Chemical Synthesis Intermediate: A key building block for synthesizing dyes, pigments, and photographic chemicals.
• Catalyst & Curing Agent: Used as an acid catalyst in esterification and condensation reactions, and as a curing agent for epoxy resins and phenolic resins.
• Pharmaceutical Manufacturing: Employed in the production of certain APIs (Active Pharmaceutical Ingredients) and as a reagent in organic synthesis.
• Electroplating Additive: Functions as a brightening agent and leveler in electroplating baths for metal finishing.
• Ion Exchange Resins: Acts as a monomer or functionalization agent in the production of specialty ion exchange resins.
• Surfactant & Detergent Intermediate: Used in the manufacture of specialized surfactants and detergent formulations.

Basic Information

Product Name	o-Cresolsulfonic Acid
CAS No.	7134-04-5
Molecular Formula	C7H8O4S
Molecular Weight	188.20 g/mol
Synonyms	2-Methylbenzenesulfonic Acid; 2-Cresolsulfonic Acid; ortho-Cresolsulfonic Acid; o-Toluenesulfonic Acid (Note: often refers to the methylbenzene derivative, but used interchangeably in some contexts); 2-Hydroxymethylbenzenesulfonic Acid; 2-Methylphenol-4-sulfonic Acid; Cresol-4-sulfonic Acid (o-isomer); Kyselina o-kresolsulfonova (Czech); o-Kresolsulfonsäure (German)
EINECS	230-418-9

Quality Control

Our o-Cresolsulfonic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, identity, and impurity profiles. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance with your quality requirements.

Storage

Preserve in a tightly closed container, protected from light. Due to its hygroscopic (moisture-sensitive) nature, store in a cool, dry, and well-ventilated area. Recommended storage temperature is between 15°C and 25°C. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid or crystalline mass
Identification (IR)	Conforms
Assay (Titration)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Sulfate (as SO4)	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.