Description

Disodium 4,4'-Bis[[4-(3-Chloro-2-Hydroxypropoxy)Phenyl]Azo]Stilbene-2,2'-Disulphonate is a high-purity, synthetic organic compound belonging to the stilbene azo dye class, identified by CAS No. 85136-26-1. It is engineered to deliver consistent, vibrant coloration and excellent performance in demanding industrial applications. This product is essential for manufacturers in the textile, paper, and specialty chemical industries seeking reliable and high-quality dye intermediates.

Application

• Textile Dyeing and Printing: Primarily used as a key intermediate for producing bright, wash-fast fluorescent whitening agents (FWAs) and optical brighteners for synthetic fibers like polyester and nylon.
• Paper Manufacturing: Employed in the production of high-brightness papers, including specialty and decorative papers, to enhance whiteness and optical appearance.
• Detergent and Soap Formulation: Incorporated into premium laundry detergents and cleaning products as a whitening agent to impart a visual impression of cleanliness and brightness on fabrics.
• Plastics and Polymer Industry: Used as a colorant and brightening additive in certain plastics and coatings to improve aesthetic qualities.
• Research and Development: Serves as a critical reference standard and building block in chemical R&D for developing new dyes and functional materials.
• Specialty Inks: Potential application in the formulation of specialty inks requiring specific fluorescent or color properties.

Basic Information

Item	Detail
Product Name	Disodium 4,4'-Bis[[4-(3-Chloro-2-Hydroxypropoxy)Phenyl]Azo]Stilbene-2,2'-Disulphonate
CAS No.	85136-26-1
Molecular Formula	C38H32Cl2N4Na2O14S2
Molecular Weight	933.68 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; 4,4'-Bis[[4-(3-chloro-2-hydroxypropoxy)phenyl]azo]stilbene-2,2'-disulfonic acid disodium salt; Disodium 4,4'-bis(4-(3-chloro-2-hydroxypropoxy)phenyl)azostilbene-2,2'-disulfonate; FBA 220; CBS-X; Optical Brightener 220; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[(3-chloro-2-hydroxypropoxy)phenyl]azo]benzenesulfonic acid] disodium salt
EINECS	Contact for details

Quality Control

Our Disodium 4,4'-Bis[[4-(3-Chloro-2-Hydroxypropoxy)Phenyl]Azo]Stilbene-2,2'-Disulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for industrial use. Certificates of Analysis (COA) documenting batch-specific results are available upon request to support your quality assurance protocols.

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 to prevent absorption of atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to orange-yellow powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Ash Content	≤ 0.5%
Solubility (in water)	Clear, yellow solution

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