Description

Fluorescent Brightening Agent 37 is a high-performance stilbene derivative optical brightener widely used to enhance the whiteness and brightness of various substrates. This agent is critical for manufacturers seeking to achieve superior visual appeal and color correction in their finished products. It is an essential component for industries including paper production, textile finishing, detergent formulation, and polymer processing, where optical properties directly impact market competitiveness.

Application

• Primary brightening agent for wood pulp and recycled fiber in the paper and pulp industry.
• Key additive in laundry detergents and fabric softeners for textile care and whitening.
• Surface treatment and masterbatch additive for plastics and synthetic fibers like polyester and nylon.
• Coating formulations for high-quality printing and writing papers to improve print contrast and opacity.
• Brightening agent in soaps and personal care products where a clean, white appearance is desired.
• Processing aid in the textile industry for yarns, threads, and finished fabrics.

Basic Information

Product Name	Fluorescent Brightening Agent 37
CAS No.	61725-17-5
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	FBA 37; Optical Brightener 37; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid; Tinopal UNPA-GX; Blankophor BBH; Fluorescent Whitening Agent 37; Stilbene Brightener 37; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[(4-morpholinyl)-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid]
EINECS	Contact for details

Quality Control

Our Fluorescent Brightening Agent 37 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent performance, including assay, hue, and solubility profiles. A Certificate of Analysis (COA) documenting purity, physical properties, and performance characteristics is provided with each shipment to guarantee it meets your specific application 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. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

Specification

Item	Specification
Appearance	Yellowish-green powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Moisture Content	≤ 2.0%
Ash Content	≤ 0.5%
pH (1% Solution)	7.0 - 9.0
Whiteness Degree	Standard sample comparison
Solubility in Water	Good

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