Description

C.I. Fluorescent Brightener 156 is a high-performance stilbene-based 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 products. It is primarily utilized by industries involved in the production of synthetic fibers, plastics, detergents, and paper, where optical enhancement is a key quality parameter.

Application

• Primary whitening agent for synthetic fibers, particularly polyamide (nylon) and polyester textiles.
• Brightening component in laundry detergents and fabric softeners for a "whiter-than-white" effect on fabrics.
• Optical brightener for plastics and polymers, including PVC, polyolefins, and engineering plastics.
• Enhancement of brightness and opacity in paper and paperboard production.
• Used in the formulation of coatings, inks, and paints to improve luminosity.
• Application in acrylic and other specialty resins for improved visual characteristics.

Basic Information

Product Name	C.I. Fluorescent Brightener 156
CAS No.	12224-20-3
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	850.98 g/mol
Synonyms	Fluorescent Brightener 156; Tinopal® CBS-X; Blankophor® P 167; 2,2'-(1,2-Ethenediyl)bis[5-[[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid] disodium salt; 4,4'-Bis[[4-[bis(2-hydroxyethyl)amino]-6-anilino-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid disodium salt; FBA 156; Optical Brightener OB-1
EINECS	235-418-6

Quality Control

Our C.I. Fluorescent Brightener 156 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent purity, performance, and compliance with industry specifications. A detailed Certificate of Analysis (COA) documenting key parameters such as assay, hue, and solubility is provided with each shipment to guarantee product integrity 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. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product efficacy.

Specification

Item	Specification
Appearance	Yellowish-green powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0%
Hue	Standardized against reference
Moisture Content	≤ 5.0%
Ash Content	≤ 0.5%
Solubility (in water)	Clear, faint yellow solution

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