Description

3-[(1,5-Dihydroxy-2-Naphthyl)Azo]-4-Hydroxybenzenesulphonic Acid is a specialized azo dye intermediate and analytical reagent known for its distinct chromophoric properties. This compound is valued for its ability to form stable, colored complexes, making it a critical component in the synthesis of high-performance dyes and pigments. It serves the needs of manufacturers in the dyestuff, textile, and analytical chemistry sectors, where precise color development and chemical reactivity are paramount.

Application

• Primary Intermediate for the synthesis of specific azo dyes and pigments used in textiles and inks.
• Complexometric Indicator in analytical chemistry for the titration of metal ions.
• Research & Development reagent in organic synthesis and photochemical studies.
• Specialty Chemical for creating colorants with specific light-fastness and solubility properties.
• Potential use in the formulation of pH indicators and biological stains.

Basic Information

Product Name	3-[(1,5-Dihydroxy-2-Naphthyl)Azo]-4-Hydroxybenzenesulphonic Acid
CAS No.	25747-07-3
Molecular Formula	C17H12N2O7S
Molecular Weight	388.35 g/mol
Synonyms	3-[(1,5-Dihydroxy-2-naphthyl)azo]-4-hydroxybenzenesulfonic acid; 4-Hydroxy-3-[(1,5-dihydroxy-2-naphthyl)azo]benzenesulfonic acid; 1,5-Dihydroxy-2-(2-hydroxy-5-sulfophenylazo)naphthalene; Acid Dye Intermediate; Azo Dye Precursor; C.I. 15685; Benzenesulfonic acid, 3-[(1,5-dihydroxy-2-naphthalenyl)azo]-4-hydroxy-
EINECS	Contact for details

Quality Control

Our production of 3-[(1,5-Dihydroxy-2-Naphthyl)Azo]-4-Hydroxybenzenesulphonic Acid adheres to stringent quality protocols to ensure batch-to-batch consistency and high purity. The material is characterized and tested against established in-house specifications. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with every shipment to support your quality assurance and regulatory needs.

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 nature, the container must be kept tightly sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown 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.