Description

4-Aminonaphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble aromatic intermediate essential for the synthesis of specialized dyes and pigments. Its value lies in its dual sulphonic acid groups, which provide excellent solubility and binding sites for creating vivid, colorfast azo dyes and fluorescent markers. This compound is primarily needed by manufacturers in the dye and pigment, specialty chemical, and research and development sectors seeking reliable, high-quality intermediates for advanced colorant production.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of acid dyes, direct dyes, and reactive dyes used for textiles, leather, and paper.
• Fluorescent Dye Synthesis: Used in the production of naphthalimide-based fluorescent dyes and markers for biological staining and analytical applications.
• Pigment Manufacturing: Serves as a precursor for high-performance organic pigments requiring specific solubility and hue properties.
• Chemical Research: Employed as a standard or reagent in organic synthesis and photochemical studies due to its defined structure.
• Specialty Additives: Potential use in the formulation of optical brighteners or functional additives for polymers and coatings.

Basic Information

Product Name	4-Aminonaphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	83929-51-5
Molecular Formula	C₁₀H₇NNa₂O₆S₂
Molecular Weight	371.27 g/mol
Synonyms	2,7-Naphthalenedisulfonic acid, 4-amino-, disodium salt; 4-Amino-2,7-naphthalenedisulfonic acid disodium salt; 2,7-Disulfo-4-naphthylamine sodium salt; Acid Yellow 7 intermediate; C.I. 56205; 4-Amino-2,7-NDSA disodium salt; 1-Naphthylamine-4,8-disulfonic acid (related isomer); Contact for EINECS details.

Quality Control

Our 4-Aminonaphthalene-2,7-Disulphonic Acid, Sodium Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye intermediate applications. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and consistency.

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 when not in use to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Light beige to grayish powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, complete solution

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