Description

Fluorescent Brightener 205 is a high-performance stilbene-based optical brightening agent (OBA) designed to enhance the whiteness and brightness of various substrates. This compound is critical for manufacturers seeking to achieve superior visual appeal and perceived quality in their finished products. It is an essential additive for industries including plastics, synthetic fibers, detergents, and paper, where brilliant whiteness is a key market differentiator.

Application

• Primary use as a brightening agent for synthetic fibers like polyester, nylon, and acetate during melt spinning or in spin finishes.
• Incorporation into thermoplastics and engineering plastics (e.g., PVC, ABS, PS) to correct yellowness and impart a clean, blue-white appearance.
• Formulation into household and industrial laundry detergents and fabric softeners to provide a whitening effect on textiles.
• Application in the paper and pulp industry to improve the brightness of high-quality writing, printing, and packaging papers.
• Use in coatings, inks, and adhesives where optical brightening is required for premium finishes.
• Potential use in advanced material applications requiring fluorescence, such as security printing or optical sensors.

Basic Information

Product Name	Fluorescent Brightener 205
CAS No.	61951-69-7
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	Fluorescent Brightener ER-I; Tinopal CBS-X; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid]; 4,4'-Bis[[4-[bis(2-hydroxyethyl)amino]-6-anilino-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid; Blankophor ER; Optical Brightener 205; OBA 205; FBA 205
EINECS	263-360-5

Quality Control

Our Fluorescent Brightener 205 is manufactured under a strict quality management system. Every batch is tested to ensure consistent performance in key parameters such as brightening strength, hue, and solubility. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing purity and physical specifications. Our production adheres to ISO 9001 standards, ensuring reliability for your critical industrial processes.

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 sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Brightening Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 2.0%
Ash Content	≤ 0.5%
Solubility (in water)	Clear, faint yellow solution
pH (1% aqueous solution)	7.0 - 9.0

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