Description

7-Amino-4-Hydroxy-3-[(7-Sulfo-1-Naphtyl)Azo]-2-Naphthalenesulfonic Acid is a high-purity, water-soluble azo dye intermediate essential for producing vibrant and stable synthetic colors. Its value lies in its ability to form strong covalent bonds with various substrates, resulting in dyes with excellent lightfastness and wash resistance. This compound is a critical raw material for manufacturers in the textile, leather, ink, and specialty chemical industries seeking to develop high-performance colorants.

Application

• Textile Dyeing: Primary intermediate for synthesizing acid dyes and direct dyes used on wool, silk, nylon, and cellulose fibers.
• Leather Coloring: Key component in the production of dyes for imparting deep, uniform color to leather goods.
• Ink Manufacturing: Used in the formulation of industrial inks, including those for packaging and specialty printing, due to its color strength.
• Paper Dyeing: Employed in the production of dyes for coloring paper and paperboard.
• Biological Staining: Potential use as a precursor for histological stains in laboratory settings.
• Research & Development: Serves as a building block for novel chromophores and functional dyes in academic and industrial R&D.

Basic Information

Item	Details
Product Name	7-Amino-4-Hydroxy-3-[(7-Sulfo-1-Naphtyl)Azo]-2-Naphthalenesulfonic Acid
CAS No.	75627-26-8
Molecular Formula	C₂₀H₁₄N₄O₈S₂
Molecular Weight	502.48 g/mol
Synonyms	Acid Black 210; C.I. 28440; 7-Amino-4-hydroxy-2-naphthalenesulfonic acid-3-azo-7'-sulfo-1'-naphthalene; 1-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[(7-sulfo-1-naphthalenyl)azo]-; 7-Amino-4-hydroxy-3-(7-sulfo-1-naphthylazo)-2-naphthalenesulfonic acid; 3-[(7-Sulfo-1-naphthyl)azo]-7-amino-4-hydroxy-2-naphthalenesulfonic acid
EINECS	Contact for details

Quality Control

Our production of 7-Amino-4-Hydroxy-3-[(7-Sulfo-1-Naphtyl)Azo]-2-Naphthalenesulfonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and meet precise customer specifications. A Certificate of Analysis (COA) detailing all relevant parameters is provided with each shipment.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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