Description

4,4'-[(2-Methyl-5-Sodiosulfo-1,3-Phenylene)Bis[Azo(2,6-Diamino-5-Methyl-3,1-Phenylene)Azo]]Bis[Naphthalene-1-Sulfonic Acid Sodium] Salt is a high-purity, water-soluble azo dye intermediate known for its complex polyazo structure and excellent chromophore properties. This compound is valued for its ability to impart strong, vibrant colors and its reactivity in synthesizing specialized dyes and pigments. It is primarily sought by manufacturers in the textile, leather, and specialty ink industries for producing high-performance colorants with good fastness properties.

Application

• Textile Dyeing: A key intermediate for synthesizing direct, acid, and reactive dyes for coloring cotton, wool, silk, and nylon fibers.
• Leather Finishing: Used in the production of dyes for achieving deep, uniform shades on leather goods.
• Paper Coloring: Employed in the manufacture of dyes for specialty papers and packaging materials.
• Ink Formulation: Serves as a precursor for pigments and dyes used in inks for printing and packaging.
• Biological Staining: Potential use as an intermediate for histochemical stains and indicators in laboratory settings.
• Research & Development: Utilized in chemical research for developing new polymeric dyes and functional colorants.

Basic Information

Product Name	4,4'-[(2-Methyl-5-Sodiosulfo-1,3-Phenylene)Bis[Azo(2,6-Diamino-5-Methyl-3,1-Phenylene)Azo]]Bis[Naphthalene-1-Sulfonic Acid Sodium] Salt
CAS No.	6428-28-0
Molecular Formula	C46H38N10Na4O14S4
Molecular Weight	~1190.1 g/mol (Contact for exact details)
Synonyms	Direct Black 19 (Parent Dye); C.I. 35255; 4,4'-[2-Methyl-5-sulfo-1,3-phenylene)bis[azo(2,6-diamino-5-methyl-3,1-phenylene)azo]]bis[1-naphthalenesulfonic acid], tetrasodium salt; Tetrasodium 4,4'-[2-methyl-5-sulfonato-1,3-phenylene)bis[azo(2,6-diamino-5-methyl-3,1-phenylene)azo]]di(naphthalene-1-sulfonate); Polyazo dye intermediate; Azo dye precursor 6428-28-0
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed using advanced techniques like HPLC and spectrophotometry to confirm identity and strength. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with every shipment to support your quality assurance processes.

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 tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Solubility (Water)	Freely soluble
Heavy Metals (as Pb)	Max. 20 ppm
Related Substances (HPLC)	Individual impurity: Max. 1.0% Total impurities: Max. 5.0%

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