Description

Dipotassium 4,4'-Bis[(4-Hydroxyphenyl)Azo]Stilbene-2,2'-Disulphonate is a high-purity, water-soluble organic dye salt belonging to the class of disulfonated azo compounds. This compound is valued for its strong and stable color properties, making it a critical component in specialized industrial applications where precise coloration is required. It is primarily sought by manufacturers in the textile, paper, and specialty chemical industries for its performance as a functional dye or intermediate.

Application

• Textile Dyeing and Printing: Used as a direct or reactive dye for coloring natural and synthetic fibers, particularly where bright, lightfast shades are needed.
• Paper Coloring: Employed in the production of specialty papers, including decorative and security papers, to impart consistent and vibrant hues.
• Functional Dye Intermediate: Serves as a key precursor or intermediate in the synthesis of more complex dyes, pigments, and optical brighteners.
• Liquid Crystal Displays (LCDs): Potential application as a dichroic dye in guest-host LCD systems due to its azo-stilbene structure.
• Biological Staining: Used in research and diagnostic applications as a histological stain for microscopic analysis.
• Ink Formulation: Incorporated into specialty inks for non-impact printing, security marking, and packaging.

Basic Information

Product Name	Dipotassium 4,4'-Bis[(4-Hydroxyphenyl)Azo]Stilbene-2,2'-Disulphonate
CAS No.	75508-33-7
Molecular Formula	C32H20K2N4O10S2
Molecular Weight	762.84 g/mol
Synonyms	Direct Yellow 11 (Dipotassium Salt); C.I. 40000; 4,4'-Bis[(4-hydroxyphenyl)azo]stilbene-2,2'-disulfonic acid dipotassium salt; Dipotassium 4,4'-[1,2-ethenediylbis[(2-sulfo-4,1-phenylene)azo]]bis[phenol]; Azo Stilbene Yellow; Solvent Yellow 82 (related); Stilbene Yellow; Bright Yellow 2G
EINECS	Contact for details

Quality Control

Our production of Dipotassium 4,4'-Bis[(4-Hydroxyphenyl)Azo]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure consistency in purity, color strength, and solubility. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with each shipment to guarantee compliance with your technical requirements.

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 kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
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.