Description

4,4'-Bis[[2,5-Dimethyl-4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Stilbene-2,2'-Disulphonic Acid is a high-purity, water-soluble anionic dye belonging to the disulfonated stilbene azo chemical class. This compound is valued for its strong and vibrant color properties, excellent substantivity, and good light and wash fastness in various substrates. It is primarily sought after by manufacturers in the textile, paper, leather, and specialty ink industries for dyeing and coloring applications. Our supply ensures consistent quality and reliable performance for industrial-scale production processes.

Application

• Textile Dyeing: Used for dyeing cotton, wool, silk, and nylon fibers, providing bright and durable shades.
• Paper Coloring: Employed in the production of colored papers, tissues, and paperboard where high color strength is required.
• Leather Finishing: Applied in the dyeing of leather goods to achieve consistent and vibrant colors.
• Ink Formulation: Serves as a colorant in the manufacture of specialty inks, including inks for ballpoint pens and markers.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its specific affinity.
• Liquid Detergent & Soap Coloring: Used to add color to household and industrial cleaning products.

Basic Information

Product Name	4,4'-Bis[[2,5-Dimethyl-4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Stilbene-2,2'-Disulphonic Acid
CAS No.	85959-57-5
Molecular Formula	C46H38N8O10S4
Molecular Weight	999.10 g/mol
Synonyms	Direct Yellow 11; C.I. 40000; Stilbene Yellow; 4,4'-Bis[(2,5-dimethyl-4-[(4-sulfophenyl)azo]phenyl)azo]-2,2'-stilbenedisulfonic Acid; Direct Fast Yellow 11; Amanil Fast Yellow 2G; Atul Direct Fast Yellow 2G; Pyrazol Fast Yellow FG
EINECS	Contact for details

Quality Control

Our production of 4,4'-Bis[[2,5-Dimethyl-4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Stilbene-2,2'-Disulphonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure compliance with industry specifications for color strength, purity, and impurity profiles. Certificates of Analysis (COA) documenting key parameters such as assay, shade, solubility, and heavy metal content are available upon request to support your quality assurance and regulatory 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). Keep away from incompatible materials and heat sources. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Orange to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 5% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1%
Heavy Metals (as Pb)	≤ 20 ppm
Ash Content	≤ 1.0%

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