Description

Fluorescent Brightener 185 is a high-performance stilbene-based optical brightening agent (OBA) designed to impart a brilliant white appearance to various substrates. Its core value lies in its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, effectively masking yellowing and enhancing perceived whiteness and brightness. This product is essential for manufacturers in the plastics, synthetic fibers, coatings, and detergent industries seeking to improve the aesthetic appeal and marketability of their finished products.

Application

• Plastics and Polymers: Widely used in the whitening and brightening of PVC, polyolefins (PP, PE), ABS, and engineering plastics for applications in household appliances, packaging, and automotive parts.
• Synthetic Fibers: Effective for the mass pigmentation and spin-dyeing of polyester, nylon, and acetate fibers to achieve high whiteness grades in textiles and non-wovens.
• Coatings and Inks: Incorporated into paints, lacquers, and printing inks to enhance opacity and create optically brightened white finishes.
• Detergent and Soap: Used as a key additive in laundry detergents and fabric softeners to provide a whitening effect on textiles during washing.
• Paper and Pulp: Applied in the production of high-quality white paper, board, and tissue to improve brightness where chlorine-free bleaching is used.
• Photographic Industry: Utilized in certain photographic materials and papers to improve image contrast and background whiteness.

Basic Information

Item	Detail
Product Name	Fluorescent Brightener 185
CAS No.	2866-43-5
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole; Fluorescent Brightener OB-1; 4,4'-Bis(2-benzoxazolyl)stilbene; BBS; FBA 185; Tinopal OB; Blankophor ER; Hostalux EBB
EINECS	220-685-7

Quality Control

Our Fluorescent Brightener 185 is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent performance, including purity assay, spectral identification, and application performance tests. A Certificate of Analysis (COA) detailing specific results for key parameters is provided with each shipment to guarantee compliance with your technical requirements.

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). Keep away from heat sources and incompatible materials. Under these conditions, the product remains stable for extended periods.

Specification

Item	Specification
Appearance	Light yellow to greenish-yellow powder
Identification (IR)	Conforms to standard
Purity (HPLC)	≥ 99.0%
Melting Point	358 - 362 °C
Loss on Drying	≤ 0.5%
Ash Content	≤ 0.3%
Absorbance (Ethanol)	Within specified range
Fluorescence Intensity	≥ 98% of reference standard

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