Description

Fluorescent Brightener 135 is a high-performance stilbene-based optical brightening agent (OBA) designed to impart a brilliant white appearance to materials. Its core value lies in its exceptional whitening and brightening efficacy, compensating for the natural yellowish tint of substrates by absorbing ultraviolet light and re-emitting it as visible blue light. This product is essential for manufacturers in the plastics, synthetic fibers, and detergent industries seeking to enhance the visual appeal and perceived cleanliness of their products. Consistent quality and batch-to-batch uniformity ensure reliable performance in demanding industrial applications.

Application

• Primary whitening agent for a wide range of thermoplastics including PVC, polyethylene (PE), polypropylene (PP), and polystyrene (PS).
• Critical component in the production of synthetic fibers such as polyester, nylon, and acrylics to achieve a bright, white base or to neutralize yellowing.
• Formulation of high-efficiency laundry detergents and fabric softeners to make white fabrics appear brighter and colors more vivid.
• Brightening of paper and paperboard to achieve high levels of whiteness and opacity in printing and packaging grades.
• Use in coatings, inks, and paints to improve brightness and visual quality of finished surfaces.
• Application in adhesives and sealants where a clean, white appearance is required for the final product.

Basic Information

Product Name	Fluorescent Brightener 135
CAS No.	1041-00-5
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 135; Tinopal OB; Blankophor BSU; Hostalux EBB
EINECS	213-879-6

Quality Control

Every batch of Fluorescent Brightener 135 is manufactured and tested under a strict quality management system. We ensure compliance with relevant industry standards and specifications for optical brighteners. Key parameters including purity, hue, and thermal stability are rigorously verified using advanced analytical techniques such as HPLC and spectrophotometry. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and consistent performance for our global B2B clients.

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). Keep away from heat sources and incompatible materials. The product is light-sensitive; prolonged exposure to direct light should be avoided to maintain optimal efficacy.

Specification

Item	Specification
Appearance	Yellowish-green powder or crystals
Identification (IR)	Conforms to standard
Purity (HPLC)	≥ 99.0%
Melting Point	358 - 362 °C
Loss on Drying	≤ 0.5%
Ash Content	≤ 0.2%
Absorption Max (λmax)	374 nm (in DMF)
Fluorescence Emission	430 nm (typical)

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