Description

4-Aminonaphthalene-1,5-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble aromatic intermediate essential for the synthesis of complex dyes and pigments. Its primary value lies in its dual sulfonic acid groups and amino functionality, which enable the creation of vivid, colorfast azo dyes. This compound is a critical raw material for manufacturers in the dye and pigment industry, as well as for research institutions developing advanced organic materials and fluorescent markers.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key coupling component in the production of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Fluorescent Whitening Agents (FWAs): Used in the synthesis of optical brighteners for detergents, plastics, and paper products.
• Specialty Chemical Synthesis: Acts as a building block for more complex sulfonated aromatic compounds used in various organic syntheses.
• Research & Development: Employed in academic and industrial R&D for developing novel dyes, sensors, and functional organic molecules.
• Analytical Reagents: Can be utilized in the preparation of reagents for chemical analysis and detection.

Basic Information

Product Name	4-Aminonaphthalene-1,5-Disulphonic Acid, Sodium Salt
CAS No.	83732-82-5
Molecular Formula	C10H7NNa2O6S2
Molecular Weight	371.27 g/mol
Synonyms	1,5-Naphthalenedisulfonic acid, 4-amino-, disodium salt; 4-Amino-1,5-naphthalenedisulfonic acid disodium salt; Disodium 4-aminonaphthalene-1,5-disulfonate; 1-Amino-4,8-naphthalenedisulfonic acid disodium salt; Aminonaphthalenedisulfonic acid sodium salt; Acid Red 337 intermediate
EINECS	Contact for details

Quality Control

Our 4-Aminonaphthalene-1,5-Disulphonic Acid, Sodium Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for industrial dye synthesis. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment to guarantee batch-to-batch consistency 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). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Off-white to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Solubility (1% in Water)	Clear to slightly hazy solution

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