Description

4'-Hydroxyazobenzene-4-Sulphonic Acid is an important azo dye intermediate and analytical reagent. This compound is valued for its ability to impart color and its utility in chemical synthesis and detection methods. It is primarily needed by manufacturers in the dye and pigment, analytical chemistry, and research sectors for producing colorants and as a chromogenic agent.

Application

• Dye and Pigment Intermediate: A key precursor in the synthesis of acid dyes, direct dyes, and other azo-based colorants for textiles, leather, and paper.
• Analytical Reagent: Used as a pH indicator and a chromogenic agent in various spectrophotometric and colorimetric analytical methods.
• Chemical Synthesis: Serves as a building block for more complex organic molecules in pharmaceutical and specialty chemical research.
• Biological Staining: Potential application in histological stains and biological assays due to its color properties.
• Ink Formulation: Can be utilized in the production of specialized inks requiring specific color characteristics.
• Laboratory Research: Employed in academic and industrial R&D for studying azo compound chemistry and photochemical properties.

Basic Information

Product Name	4'-Hydroxyazobenzene-4-Sulphonic Acid
CAS No.	2918-83-4
Molecular Formula	C₁₂H₁₀N₂O₄S
Molecular Weight	278.29 g/mol
Synonyms	4-Hydroxyazobenzene-4'-sulfonic Acid; 4-(4-Sulfophenylazo)phenol; p-Hydroxyazobenzene-p'-sulfonic Acid; Azobenzene-4,4'-disulfonic acid, hydroxy derivative; C.I. 14270; Acid Orange 12 intermediate; Phenol, 4-[(4-sulfophenyl)azo]-
EINECS	220-851-5

Quality Control

Our 4'-Hydroxyazobenzene-4-Sulphonic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards for industrial and laboratory use. A Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee consistent quality and traceability.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at 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 brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
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.