Description

4,4'-Bis[4,6-Bis(Anilino)-1,3,5-Triazin-2-Yl]Aminostilbene-2,2'-Disulphonic Acid is a high-performance, sulfonated stilbene-triazine derivative that functions as a key optical brightening agent (OBA) or fluorescent whitening agent (FWA). Its primary value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby enhancing the perceived whiteness and brightness of materials. This compound is essential for manufacturers in the detergent, paper, textile, and plastics industries seeking to achieve superior product aesthetics and optical quality.

Application

• Detergent & Laundry Care Formulations: As a critical additive in laundry detergents, fabric softeners, and soaps to impart a brilliant white appearance to textiles.
• Paper Manufacturing & Coating: Used in the production of high-quality writing, printing, and specialty papers to increase brightness and opacity.
• Textile & Fiber Treatment: Applied in the finishing process of natural and synthetic fibers (cotton, polyester, nylon) to compensate for yellowish tints.
• Plastics & Polymer Industry: Incorporated into polymers, synthetic fibers, and coatings to improve visual appeal and counteract inherent yellowness.
• Advanced Material Synthesis: Serves as a functional intermediate or monomer in the development of specialty dyes, pigments, and light-emitting materials.

Basic Information

Product Name	4,4'-Bis[4,6-Bis(Anilino)-1,3,5-Triazin-2-Yl]Aminostilbene-2,2'-Disulphonic Acid
CAS No.	88-38-0
Molecular Formula	C44H34N12O6S2
Molecular Weight	891.0 g/mol
Synonyms	Fluorescent Brightener 71; Tinopal CBS-X; Stilbene Brightener 71; 4,4'-Bis[(4-anilino-6-anilino-s-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[(4-anilinophenyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid]; FWA 71; CBS-X; Optical Brightener OB-1 (related class).
EINECS	201-819-7

Quality Control

Our production of 4,4'-Bis[4,6-Bis(Anilino)-1,3,5-Triazin-2-Yl]Aminostilbene-2,2'-Disulphonic Acid adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for strength and hue, and checks for residual solvents and sulfonation efficiency. We provide a detailed Certificate of Analysis (COA) with each shipment, ensuring traceability and compliance with your specifications and relevant 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). This material is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance and handling properties.

Specification

Item	Specification
Appearance	Light yellow to yellowish powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Strength (Spectrophotometry)	100 ± 3% (vs. Standard)
Hue	Meets standard requirement
Moisture Content (KF)	≤ 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.