Description

Sodium Hydrogen 4-Aminonaphthalene-2,7-Disulphonate is a high-purity, water-soluble aromatic intermediate characterized by its aminonaphthalene core and dual sulphonate groups. This compound is valued for its role as a critical building block in the synthesis of complex dyes and pigments, offering excellent coupling properties and solubility. It is primarily required by manufacturers in the colorant industry for producing vibrant, lightfast azo dyes, as well as by research institutions developing advanced organic materials and fluorescent markers.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key diazo component in the manufacture of acid dyes, direct dyes, and reactive dyes for textiles, leather, and paper.
• Fluorescent Whitening Agent (FWA) Synthesis: Used in the production of optical brighteners for detergents, plastics, and paper products.
• Specialty Chemical Synthesis: Acts as a precursor for sulfonated naphthalene derivatives used in concrete plasticizers, dispersants, and other functional polymers.
• Biochemical Research & Staining: Employed in laboratory settings for the development of histological stains and fluorescent probes.
• Photographic Chemicals: Can be utilized in the formulation of certain color photographic chemicals and sensitizers.

Basic Information

Product Name	Sodium Hydrogen 4-Aminonaphthalene-2,7-Disulphonate
CAS No.	69966-61-6
Molecular Formula	C₁₀H₈NNaO₇S₂
Molecular Weight	349.29 g/mol
Synonyms	4-Amino-2,7-naphthalenedisulfonic Acid Monosodium Salt; 2,7-Naphthalenedisulfonic Acid, 4-Amino-, Monosodium Salt; 4-Amino-2,7-naphthalenedisulfonate Sodium Salt; 4-Aminonaphthalene-2,7-disulphonic Acid Sodium Salt; Sodium 4-Amino-2,7-naphthalenedisulfonate; 4-Amino-2,7-NDSA Sodium Salt; 1-Amino-4,8-naphthalenedisulfonic Acid Sodium Salt (alternative numbering); Acid Red 337 Intermediate
EINECS	Contact for details

Quality Control

Our production of Sodium Hydrogen 4-Aminonaphthalene-2,7-Disulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and high chemical purity. Every lot is analyzed against rigorous in-house specifications, which typically include identity confirmation, assay (purity), and control of key impurities. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance and regulatory compliance 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). 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%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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