Description

4,4'-Bis[[4-[Bis(2-Hydroxyethyl)Amino]-6-(m-Sulphoanilino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid CAS NO 5131-70-4 is a high-performance fluorescent whitening agent (FWA) belonging to the triazinylaminostilbene disulfonate class. Its primary value lies in its exceptional ability to absorb UV light and re-emit it as visible blue light, effectively compensating for yellowish tints and enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to achieve superior optical brightening effects in their products.

Application

• Textile Finishing: As a key optical brightener for cotton, viscose, nylon, and wool, providing brilliant white shades and high lightfastness.
• Detergent and Soap Formulation: Incorporated into laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" appearance to laundered fabrics.
• Paper Manufacturing: Used in the coating and sizing of high-quality writing, printing, and packaging papers to improve brightness and opacity.
• Plastics and Synthetic Fibers: Applied in the mass coloration of polymers like PVC, polyolefins, and polyester to correct yellowness and enhance visual appeal.
• Advanced Coatings: Employed in formulations for paints, varnishes, and inks where optical brightening is required.
• Personal Care Products: Used in select cosmetic and personal care formulations to enhance the brightness of substrates.

Basic Information

Item	Details
Product Name	4,4'-Bis[[4-[Bis(2-Hydroxyethyl)Amino]-6-(m-Sulphoanilino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid
CAS No.	5131-70-4
Molecular Formula	C46H50N14O14S4
Molecular Weight	1151.2 g/mol
Synonyms	Fluorescent Brightener 220; Tinopal CBS-X; Blankophor BSU; 4,4'-Bis[(4-anilino-6-bis(2-hydroxyethyl)amino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid; Stilbene Brightener 220; FWA 220; Optical Brightener OB-1; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[bis(2-hydroxyethyl)amino]-6-[(3-sulfophenyl)amino]-1,3,5-triazin-2-yl]amino]benzenesulfonic acid]
EINECS	225-881-1

Quality Control

Our production of 4,4'-Bis[[4-[Bis(2-Hydroxyethyl)Amino]-6-(m-Sulphoanilino)-1,3,5-Triazin-2-Yl]Amino]Stilbene-2,2'-Disulphonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and assay, spectrophotometry for strength and shade, and checks for insolubles and heavy metals. Certificates of Analysis (COA) documenting full specifications are provided to ensure compliance with your application requirements and industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent moisture absorption and caking. 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%
pH (1% Solution)	7.0 - 9.0
Ash Content	≤ 0.5%
Fluorescent Strength	100 ± 5% (vs. Standard)
Solubility in Water	Clear, yellow solution

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