Description

Disodium 4,4'-Bis[(4-Hydroxy-2-Methylphenyl)Azo]Stilbene-2,2'-Disulphonate is a high-purity, synthetic organic compound belonging to the class of azo dyes and optical brightening agents. Its primary value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, making it a critical component for enhancing whiteness and brightness in various materials. This product is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to improve the visual appeal and perceived quality of their finished goods.

Application

• Optical Brightening Agent (OBA) for Paper and Pulp: Incorporated into coatings and mass to achieve high whiteness and brightness in premium printing, writing, and packaging papers.
• Textile and Fabric Brightener: Used in the finishing process for cotton, nylon, and other fibers to counteract yellowing and impart a brilliant white appearance.
• Detergent and Laundry Care Formulations: A key ingredient in laundry detergents, fabric softeners, and soaps to make white fabrics appear cleaner and brighter after washing.
• Plastics and Polymer Additive: Added to polymers like PVC, polyolefins, and styrenics to improve whiteness, mask inherent yellowness, and enhance color vibrancy in final plastic products.
• Cosmetics and Personal Care: Employed in certain cosmetic formulations, such as shampoos and conditioners, to provide a visual brightening effect.
• Advanced Material Research: Utilized in research settings for developing fluorescent sensors, imaging agents, and other functional materials due to its photophysical properties.

Basic Information

Item	Details
Product Name	Disodium 4,4'-Bis[(4-Hydroxy-2-Methylphenyl)Azo]Stilbene-2,2'-Disulphonate
CAS No.	50814-29-4
Molecular Formula	C34H26N4Na2O8S2
Molecular Weight	728.68 g/mol
Synonyms	Disodium 4,4'-bis(2-methyl-4-hydroxyphenylazo)stilbene-2,2'-disulfonate; Fluorescent Brightener 351; Tinopal CBS-X; Blankophor BSU; Paper Brightener CBS; 4,4'-Bis[(4-hydroxy-2-methylphenyl)azo]-2,2'-stilbenedisulfonic Acid Disodium Salt; Stilbene Brightener; Optical Brightener CBS
EINECS	256-705-1

Quality Control

Our production of Disodium 4,4'-Bis[(4-Hydroxy-2-Methylphenyl)Azo]Stilbene-2,2'-Disulphonate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for strength and shade, and checks for residual solvents and heavy metals. We provide Certificates of Analysis (COA) with each shipment to ensure 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 room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and light-sensitive; prolonged exposure to moisture or direct light should be avoided to maintain product integrity and performance.

Specification

Item	Specification
Appearance	Yellowish to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Brightness (Fluorescence)	≥ 100% (vs. Standard)
Moisture Content	≤ 5.0%
Ash Content (Sulfated)	≤ 0.5%
pH (1% Solution)	7.0 - 9.0
Heavy Metals (as Pb)	≤ 20 ppm

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