Description

o-Hydroxybenzenesulphonic Acid is a versatile aromatic sulfonic acid derivative, also known as 2-phenolsulfonic acid, valued for its dual functionality as a strong acid and a phenolic compound. This chemical is a critical intermediate in the synthesis of dyes, pigments, and specialty chemicals, where its reactive sites enable precise molecular construction. It is essential for manufacturers in the agrochemical, pharmaceutical, and polymer industries seeking to develop advanced formulations and high-performance materials.

Application

• Chemical Synthesis Intermediate: A key building block for manufacturing azo dyes, acid dyes, and other complex organic pigments.
• Agrochemical Production: Used in the synthesis of certain herbicides and plant growth regulators.
• Pharmaceutical Intermediates: Serves as a precursor in the creation of specific active pharmaceutical ingredients (APIs).
• Polymer & Resin Modification: Acts as a curing agent or catalyst in phenolic resins and other polymer systems.
• Electroplating Additives: Employed in bath formulations for metal surface treatment and finishing.
• Laboratory Research & Development: Utilized as a reagent in organic chemistry research for sulfonation and coupling reactions.

Basic Information

Product Name	o-Hydroxybenzenesulphonic Acid
CAS No.	609-46-1
Molecular Formula	C6H6O4S
Molecular Weight	174.17 g/mol
Synonyms	2-Phenolsulfonic Acid; Phenol-2-sulfonic Acid; Phenol-o-sulfonic Acid; o-Phenolsulfonic Acid; 2-Hydroxybenzenesulfonic Acid; Salicylic Acid Sulfonate; Benzenesulfonic acid, 2-hydroxy-
EINECS	210-199-1

Quality Control

Our o-Hydroxybenzenesulphonic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including assay, impurity profiling, and physical characterization, to ensure it meets precise customer specifications and industry standards. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture. Keep away from strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow crystalline solid or solution
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 1.0%
Sulfate (as SO4)	≤ 0.5%
Residue on Ignition	≤ 0.1%

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