Description

4,4'-Bis(5-Methyl-2-Benzoxazolyl)Stilbene is a high-performance fluorescent whitening agent (FWA) and optical brightener belonging to the stilbene-bisbenzoxazole class. This compound is valued for its exceptional ability to absorb ultraviolet light and re-emit it as visible blue light, thereby enhancing the perceived whiteness and brightness of materials. It is a critical additive for manufacturers in the plastics, synthetic fibers, coatings, and detergent industries seeking to improve the aesthetic appeal of their products.

Application

• Plastics and Polymers: Primary application as an optical brightener for polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), and engineering plastics to counteract yellowing and improve visual quality.
• Synthetic Fibers: Used in the spin-finish or masterbatch for polyester, nylon, and acrylic fibers to achieve brilliant whites and bright colors in textiles and non-wovens.
• Coatings and Inks: Incorporated into paints, lacquers, and printing inks to increase whiteness and opacity, especially in white and light-colored formulations.
• Detergents and Laundry Care: Functions as a key fluorescent whitening agent in premium laundry detergents and fabric softeners to make white fabrics appear brighter and colors more vivid.
• Paper and Pulp: Applied in high-quality paper manufacturing to enhance brightness, particularly for premium writing, printing, and packaging papers.
• Advanced Materials: Investigated for use in organic light-emitting diodes (OLEDs) and as a fluorescent probe or marker in analytical chemistry due to its photostable fluorescence.

Basic Information

Product Name	4,4'-Bis(5-Methyl-2-Benzoxazolyl)Stilbene
CAS No.	2397-00-4
Molecular Formula	C30H22N2O2
Molecular Weight	442.51 g/mol
Synonyms	Bisbenzoxazolylstilbene; 2,2'-(1,2-Ethenediyl)bis[5-methylbenzoxazole]; 4,4'-Distyrylbisbenzoxazole; Fluorescent Brightener 393; FWA 393; OB-1; CBS 127; 2,2'-(1,2-Ethenediyl)bis(5-methyl-1,3-benzoxazole); Optical Brightener OB-1
EINECS	219-253-6

Quality Control

Our production of 4,4'-Bis(5-Methyl-2-Benzoxazolyl)Stilbene adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed against comprehensive specifications, including purity (assay), melting point, absorbance, and fluorescence intensity. Certificates of Analysis (COA) detailing all test results are provided with every shipment. Our quality system supports compliance with relevant global standards for industrial and specialty chemical manufacturing.

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 / 59-77°F). Keep away from heat sources and incompatible materials. For long-term storage, consider an inert atmosphere to preserve optimal performance.

Specification

Item	Specification
Appearance	Yellow to pale yellow crystalline powder
Identification (IR)	Conforms to structure
Melting Point	≥ 355 °C
Assay (HPLC)	≥ 99.0%
Absorbance (Ethanol)	λmax 365 - 375 nm
Fluorescence Intensity	≥ 95% (vs. Standard)
Loss on Drying	≤ 0.5%
Ash Content	≤ 0.1%

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