Description

Disodium 3-Aminonaphthalene-2,7-Disulphonate is a high-purity, water-soluble aromatic intermediate of significant industrial importance. This compound serves as a critical building block in the synthesis of dyes, pigments, and optical brighteners, valued for its ability to introduce sulfonic acid groups and an amino functionality into complex molecules. It is essential for manufacturers in the textile, paper, plastics, and specialty chemical industries seeking to develop products with enhanced color fastness, solubility, and performance characteristics.

Application

• Dye and Pigment Intermediate: A key precursor for the synthesis of acid dyes, direct dyes, and reactive dyes used in textile coloring.
• Optical Brightener Production: Used in the manufacture of fluorescent whitening agents (FWAs) for paper, detergents, and plastics.
• Specialty Chemical Synthesis: Serves as a versatile intermediate for creating sulfonated aromatic compounds with specific functional properties.
• Research & Development: Employed in organic synthesis laboratories for developing new chromophores and functional materials.
• Analytical Reagent: Can be used as a standard or reagent in specific analytical and biochemical applications.

Basic Information

Product Name	Disodium 3-Aminonaphthalene-2,7-Disulphonate
CAS No.	135-50-2
Molecular Formula	C10H7NNa2O6S2
Molecular Weight	363.27 g/mol
Synonyms	3-Amino-2,7-naphthalenedisulfonic acid disodium salt; 2,7-Naphthalenedisulfonic acid, 3-amino-, disodium salt; Disodium 3-amino-2,7-naphthalenedisulfonate; 3-Amino-2,7-NDSA disodium salt; Acid Yellow 42 intermediate; C.I. 56290; 2,7-Acid; 3-Amino-2,7-naphthalenedisulphonic acid sodium salt
EINECS	205-201-7

Quality Control

Our Disodium 3-Aminonaphthalene-2,7-Disulphonate is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for use in sensitive synthesis processes. A detailed Certificate of Analysis (COA) is provided with each shipment, guaranteeing traceability, consistency, and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The material is hygroscopic; ensure containers are kept sealed to prevent moisture absorption.

Specification

Item	Specification
Appearance	Yellowish to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content	≤ 2.0%
Solubility (in Water)	Clear, complete solution
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%

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