Description

2,7-Naphthalenedisulfonic Acid, 6-Amino-4-Hydroxy-3-7-Sulfo-4-(4-Sulfophenyl)Azo-1-Naphthalenylazo-, Tetralithium Salt is a high-purity, multi-sulfonated azo dye intermediate. This compound is valued for its excellent water solubility and strong chromophoric properties, making it a critical building block for creating vivid and stable colorants. It is primarily sought after by manufacturers in the textile, ink, and specialty dye industries for producing high-performance pigments and dyes. The product is supplied with a CAS number of 106028-58-4.

Application

• Textile Dyeing: As a key intermediate for synthesizing reactive and direct dyes for cotton, wool, and nylon.
• Inkjet Inks: Used in the formulation of high-quality, water-based inks requiring excellent color strength and stability.
• Paper Coloring: Employed in the production of dyes for specialty papers and packaging materials.
• Liquid Crystal Display (LCD) Color Filters: Serves as a precursor for dyes used in electronic display applications.
• Biological Staining: Potential use as an intermediate for histological stains and indicators in analytical chemistry.
• Functional Dyes: Research and development of dyes for solar cells, sensors, and other advanced material applications.

Basic Information

Product Name	2,7-Naphthalenedisulfonic Acid, 6-Amino-4-Hydroxy-3-7-Sulfo-4-(4-Sulfophenyl)Azo-1-Naphthalenylazo-, Tetralithium Salt
CAS No.	106028-58-4
Molecular Formula	C₂₆H₁₄Li₄N₄O₁₄S₄
Molecular Weight	~798.4 g/mol (Contact for details)
Synonyms	Tetralithium 6-amino-4-hydroxy-3-[(E)-2-(4-sulfonatophenyl)diazen-1-yl]-7-sulfonato-2-naphthalenesulfonate; C.I. Acid Black 210; Acid Black 210, lithium salt; 6-Amino-4-hydroxy-3-[(E)-2-(4-sulfophenyl)diazenyl]-7-sulfo-2-naphthalenesulfonic acid tetralithium salt; Reactive Black 5 related intermediate; Multi-sulfonated azo dye intermediate; Tetralithium naphthalene azo dye salt.
EINECS	Contact for details

Quality Control

Our 2,7-Naphthalenedisulfonic Acid derivative is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity, color strength, and chemical identity. Standard specifications are verified via HPLC, UV-Vis spectroscopy, and titration methods. Certificates of Analysis (COA) detailing batch-specific results are available upon request 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); ensure the container is sealed after each use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	± 5% of standard
Water Content (KF)	≤ 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm

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