Description

4-Aminonaphthalene-1,7-Disulfonic Acid is a key aromatic sulfonic acid derivative and an important intermediate in the synthesis of complex organic dyes and pigments. Its value lies in its bifunctional structure, which allows for versatile coupling and derivatization reactions essential for producing high-performance colorants. This compound is primarily needed by manufacturers in the dye and pigment industry, as well as by research institutions developing advanced materials and specialty chemicals.

Application

• Primary intermediate in the synthesis of azo dyes and pigments, particularly for textiles and leather.
• Key building block for producing acid dyes used on nylon, silk, and wool fibers.
• Precursor in the manufacture of reactive dyes for cotton and other cellulosic materials.
• Used in research and development of fluorescent whitening agents (optical brighteners).
• Intermediate for specialty pigments used in inks, coatings, and plastics.
• Starting material in organic synthesis for pharmaceutical intermediates and fine chemicals.
• Potential use in the development of corrosion inhibitors and functional polymer additives.

Basic Information

Product Name	4-Aminonaphthalene-1,7-Disulfonic Acid
CAS No.	85-74-5
Molecular Formula	C₁₀H₉NO₆S₂
Molecular Weight	303.31 g/mol
Synonyms	1,7-Naphthalenedisulfonic acid, 4-amino-; 4-Amino-1,7-naphthalenedisulfonic acid; 4-Amino-1,7-NDSA; 1,7-Cleve's acid; 4-Amino-1,7-NDA; 4-Amino-1,7-naphthylenedisulfonic acid; 4-Amino-1,7-dihydroxynaphthalene-1,7-disulfonic acid (tautomer); Cleve's 1,7-Acid
EINECS	201-627-5

Quality Control

Our 4-Aminonaphthalene-1,7-Disulfonic Acid is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise chemical and physical specifications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided and available upon request to support your quality assurance protocols.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Off-white to light brown powder or crystals
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	≤ 0.5%
Solubility	Soluble in alkaline aqueous solutions

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