Description

5-Amino-4-Hydroxy-3-[(1-Sulpho-2-Naphthyl)Azo]Naphthalene-2,7-Disulphonic Acid is a high-purity, polyfunctional azo dye intermediate of significant commercial importance. Its complex molecular structure, featuring multiple sulphonic acid groups and an azo linkage, makes it a critical precursor for synthesizing high-value, water-soluble dyes and pigments. This compound is essential for manufacturers in the colorant industry seeking to produce vibrant, stable, and application-specific dyes for textiles, inks, and specialty coatings.

Application

• Primary intermediate for the synthesis of acid dyes and direct dyes used in textile coloration, particularly for nylon, silk, and wool.
• Key building block in the production of reactive dyes, offering excellent wash-fastness on cellulosic fibers like cotton.
• Used in the manufacture of pigments and lake colors for inks, including printing inks and writing inks.
• Employed in the synthesis of specialty dyes for leather, paper, and food colorants (where specific purity grades are met).
• Acts as a chromogenic agent or complexing ligand in analytical chemistry and research applications.
• Potential use in the development of functional dyes for non-textile applications such as lasers, optical data storage, and solar cells.

Basic Information

Product Name	5-Amino-4-Hydroxy-3-[(1-Sulpho-2-Naphthyl)Azo]Naphthalene-2,7-Disulphonic Acid
CAS No.	65237-05-0
Molecular Formula	C₂₀H₁₄N₄O₁₀S₃
Molecular Weight	566.54 g/mol
Synonyms	5-Amino-4-hydroxy-3-[(1-sulfo-2-naphthalenyl)azo]-2,7-naphthalenedisulfonic acid; C.I. Acid Black 107 Intermediate; 1-Naphthalenesulfonic acid, 5-amino-4-hydroxy-3-[(1-sulfo-2-naphthalenyl)azo]-, 2,7-disulfo derivative; Azo Dye Intermediate 65237-05-0; 3-[(1-Sulfo-2-naphthyl)azo]-5-amino-4-hydroxy-2,7-naphthalenedisulfonic acid; 65237-05-0 (CAS); Acid Black 107 Precursor
EINECS	Contact for details

Quality Control

Our production of 5-Amino-4-Hydroxy-3-[(1-Sulpho-2-Naphthyl)Azo]Naphthalene-2,7-Disulphonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) detailing assay, impurity profile, and physical characteristics are provided with each shipment and are available upon request.

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. Keep away from incompatible materials such as strong acids and organic solvents.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (Typical 97-99%)
Moisture (KF Titration)	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Sulfated Ash	≤ 0.5%

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