Description

4-4'-Bis[[4-Anilino-6-[(2-Carbamoylethyl)(2-Hydroxyethyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid is a high-performance, fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene disulfonate class. This compound is engineered to deliver exceptional optical brightening effects by absorbing ultraviolet light and re-emitting it as visible blue light, thereby enhancing the perceived whiteness and brightness of substrates. It is a critical raw material for manufacturers in the detergent, paper, textile, and plastics industries seeking to improve product aesthetics and market appeal. Its specific molecular structure provides excellent substantivity and stability under various application conditions.

Application

This fluorescent whitening agent is designed for a wide range of industrial applications where superior whitening and brightening are required:

• Laundry Detergents & Fabric Softeners: Primary use as an optical brightener to compensate for yellowing and make white fabrics appear brilliantly white and colored fabrics more vivid.
• Paper & Pulp Manufacturing: Used in coating formulations and mass coloration to achieve high brightness grades in printing, writing, and specialty papers.
• Textile & Fiber Treatment: Applied in finishing baths for cotton, nylon, and other fibers to impart a permanent whitening effect and improve color quality.
• Plastics & Synthetic Polymers: Incorporated into polymers like PVC, polyolefins, and styrenics to mask inherent yellowness and enhance the brightness of finished plastic products.
• Soaps & Personal Care Cleansers: Utilized in bar soaps and certain cleansing formulations to improve visual appeal.
• Advanced Coatings & Inks: Employed in specific coating systems where optical brightness is a key performance parameter.

Basic Information

Item	Detail
Product Name	4-4'-Bis[[4-Anilino-6-[(2-Carbamoylethyl)(2-Hydroxyethyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid
CAS No.	66085-71-0
Molecular Formula	C52H56N16O12S2
Molecular Weight	1161.22 g/mol
Synonyms	Fluorescent Brightener 220; FWA 220; Tinopal CBS-X; Stilbene triazine fluorescent whitening agent; 4,4'-Bis{[4-anilino-6-[N-(2-carbamoylethyl)-N-(2-hydroxyethyl)amino]-1,3,5-triazin-2-yl]amino}stilbene-2,2'-disulfonic acid; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[[2-(2-hydroxyethoxy)ethyl]amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid]; Optical Brightener OB-1 (industry-specific); Blankophor CBS (trade name variant)
EINECS	Contact for details

Quality Control

Our production of 4-4'-Bis[[4-Anilino-6-[(2-Carbamoylethyl)(2-Hydroxyethyl)Amino]-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent performance, including purity (assay), chromaticity, strength, and solubility checks. We provide full traceability and Certificates of Analysis (COA) are available upon request, detailing all relevant specifications 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). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Light yellow to yellowish-green powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Ash Content	≤ 0.5%
pH (1% Aqueous Dispersion)	6.0 - 8.0
Whiteness Degree (Standard Fabric)	Meets reference standard
Solubility in Water	Partially soluble, forms a colloidal dispersion

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