Description

4-Hydroxy-3-[(2-Hydroxyphenyl)Azo]Benzenesulfonic Acid is a specialized azo dye intermediate and analytical reagent. This compound matters for its role as a key precursor in synthesizing high-value dyes, pigments, and colorants, offering precise color properties and structural functionality. Industries that require it include manufacturers of textile dyes, leather colorants, and research laboratories developing pH indicators or chelating agents.

Application

• Primary Intermediate for Azo Dyes & Pigments: A critical building block in the synthesis of orange, red, and brown azo dyes used in textiles, leather, and paper.
• Analytical Chemistry Reagent: Utilized as a complexometric indicator or a chromogenic agent in spectrophotometric analysis for metal ion detection.
• Specialty Chemical Synthesis: Serves as a precursor for functional dyes with specific properties for inks, coatings, and plastics.
• Research & Development: Employed in academic and industrial R&D for developing new colorants, sensors, and functional materials.

Basic Information

Product Name	4-Hydroxy-3-[(2-Hydroxyphenyl)Azo]Benzenesulfonic Acid
CAS No.	38595-15-2
Molecular Formula	C12H10N2O5S
Molecular Weight	294.28 g/mol
Synonyms	2-Hydroxy-5-[(2-hydroxyphenyl)azo]benzenesulfonic acid; 2-Hydroxy-5-(2-hydroxyphenylazo)benzenesulfonic acid; 5-[(2-Hydroxyphenyl)azo]-2-hydroxybenzenesulfonic acid; Benzenesulfonic acid, 4-hydroxy-3-[(2-hydroxyphenyl)azo]-; Mordant Orange 1 (related dye acid); C.I. 14030 (Acid); 2-Hydroxy-5-(o-hydroxyphenylazo)benzenesulfonic acid
EINECS	Contact for details

Quality Control

Our 4-Hydroxy-3-[(2-Hydroxyphenyl)Azo]Benzenesulfonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing specifications and test results are provided and available upon request to support your quality assurance protocols.

Storage

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

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Residue on Ignition (Sulfated Ash)	≤ 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.