Description

Fluorescent Brightener 28 is a high-performance 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 cleanliness in their finished products. It is extensively utilized across the plastics, synthetic fibers, coatings, and detergent industries to counteract yellowing and impart a brilliant blue-white fluorescence. Our supply ensures consistent quality and performance for demanding industrial applications.

Application

• Plastics and Polymers: Primary whitening agent for PVC, polyolefins (PP, PE), ABS, and engineering plastics to improve aesthetic quality.
• Synthetic Fibers: Key additive in the spin finish or masterbatch for polyester, nylon, and acrylic fibers to enhance brightness.
• Detergents and Laundry Care: Formulation component in laundry detergents, fabric softeners, and soaps to make white fabrics appear brighter and colors more vivid.
• Coatings and Inks: Used in paints, varnishes, and printing inks to increase opacity and whiteness.
• Paper Manufacturing: Applied in coating formulations for high-quality paper and board to achieve a higher degree of whiteness.
• Advanced Materials: Potential use in specialty applications such as security printing and optical materials due to its fluorescent properties.

Basic Information

Product Name	Fluorescent Brightener 28
CAS No.	95508-20-6
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	Fluorescent Brightener OB; 2,2'-(1,2-Ethenediyl)bis[5-[4-(4-morpholinyl)-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid disodium salt; Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-[[4-(4-morpholinyl)-6-(phenylamino)-1,3,5-triazin-2-yl]amino]-, disodium salt; OB; FBA OB; Optical Brightener OB; 4,4'-Bis(2-sulfostyryl)biphenyl (common misnomer, often associated); Tinopal OB
EINECS	Contact for details

Quality Control

Our Fluorescent Brightener 28 is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and spectrophotometry for strength and hue, to ensure it meets precise industry specifications. A comprehensive Certificate of Analysis (COA) documenting identity, purity, and physical properties is provided with each shipment to guarantee consistency and support your quality assurance protocols.

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	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Brightness (457 nm)	≥ 100% (vs. Std.)
Moisture Content	≤ 1.0%
Ash Content	≤ 0.5%
Solubility (in DMF)	Clear solution

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