Description

2-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Nitrobenzenesulphonic Acid CAS NO 25926-45-8 is a specialized azo dye intermediate characterized by its complex aromatic structure. This compound is valued for its ability to impart specific color properties and act as a key building block in the synthesis of high-performance dyes and pigments. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries seeking to produce vivid and stable colorants.

Application

This azo compound serves as a critical intermediate in various colorant manufacturing processes. Its primary and related applications include:

• Dye and Pigment Synthesis: As a key precursor for manufacturing azo dyes and organic pigments, particularly for shades of orange, red, and brown.
• Textile Industry: Used in the production of dyes for coloring natural and synthetic fibers, including cotton, wool, and nylon.
• Ink Formulation: Employed in the manufacture of colorants for printing inks, including those for packaging and publications.
• Leather Coloring: Acts as an intermediate for dyes used in the leather tanning and finishing industry.
• Paper Coloring: Utilized in the synthesis of dyes for specialty paper products.
• Research & Development: Serves as a standard or reagent in chemical research for developing new chromophores and studying azo chemistry.
• Specialty Coatings: Used in the development of colorants for industrial and artistic paints and coatings.

Basic Information

Product Name	2-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Nitrobenzenesulphonic Acid
CAS No.	25926-45-8
Molecular Formula	C₁₇H₁₁N₃O₇S
Molecular Weight	401.35 g/mol
Synonyms	5-Nitro-2-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]benzenesulfonic acid; Benzenesulfonic acid, 2-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]-5-nitro-; C.I. 15865; Acid Orange 20 intermediate; 1-Naphthol-2-azo-5-nitrosalicylenesulfonic acid; 3-[(2-Hydroxy-1-naphthyl)azo]-5-nitro-2-hydroxybenzenesulfonic acid; 2-Hydroxy-3-(2-hydroxy-1-naphthylazo)-5-nitrobenzenesulfonic acid
EINECS	Contact for details

Quality Control

Our 2-Hydroxy-3-[(2-Hydroxy-1-Naphthyl)Azo]-5-Nitrobenzenesulphonic Acid is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency, purity, and compliance with customer specifications. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical characteristics are 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 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, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%
Solubility	Soluble in alkaline aqueous solutions

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