Description

4-Aminonaphthalene-2,6-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble aromatic intermediate of significant commercial importance. Its core value lies in its dual sulphonic acid groups and primary amine functionality, making it a versatile building block for the synthesis of complex dyes and pigments. This compound is essential for manufacturers in the colorant industry seeking to produce vivid, stable, and high-performance azo dyes and optical brighteners.

Application

• Primary Intermediate for Azo Dyes: Serves as a critical diazo component or coupling agent in the production of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Optical Brightener Synthesis: Used in the manufacture of stilbene-based optical brightening agents (OBAs) for paper, detergents, and textiles.
• Specialty Pigment Manufacturing: Acts as a key precursor for creating high-value, complex organic pigments with enhanced color strength and weatherfastness.
• Chemical Research & Development: Employed as a model compound or starting material in organic synthesis for pharmaceuticals and agrochemical research.
• Liquid Crystal Dye Production: Utilized in the synthesis of dyes for electronic displays and other advanced material applications.

Basic Information

Product Name	4-Aminonaphthalene-2,6-Disulphonic Acid, Sodium Salt
CAS No.	83929-50-4
Molecular Formula	C10H7NNa2O6S2
Molecular Weight	371.27 g/mol
Synonyms	2,6-Naphthalenedisulfonic acid, 4-amino-, disodium salt; 4-Amino-2,6-naphthalenedisulfonic acid disodium salt; 2,6-Disulfo-4-naphthylamine sodium salt; 4-Amino-2,6-NDSA disodium salt; Acid Yellow 1 intermediate; C.I. 10316; 1-Naphthylamine-4,8-disulfonic acid (isomeric form); Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our 4-Aminonaphthalene-2,6-Disulphonic Acid, Sodium Salt is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with industry specifications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical characteristics is provided with every shipment.

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 sealed to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Off-white to light beige powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%

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