Optical brightener KSN is a benzoxazole compound, and its appearance is a yellow crystalline powder with a melting point of 271℃, insoluble in water, odorless, and stable in performance. Optical brightener KSN is often used in high grade plastics that require extremely high whiteness.

Product Cate:Optical Brightening Agent For Plastic

Product Name:Optical Brightening Agent KSN

Chemical Name:4.4-bis(5-methyl-2-benzoxoazol)-ethylene

CAS No.:5242-49-9

C.I. No.:368

Molecular Formula:C30H22N2O2 


1. being highly whiteness with small usage. 

2. multipurpose used for whitening of polyester fiber and plastic. 

3. having a good compatibility and good fastness to light and sublimation. Can be used for high temperature process.

Treating ProcessOverlay plastic:0.5-2g/100kg 

Polyester fiber:10-20g

Package20kg cardboard drum

Technical IndexAppearance: greenish yellow powder 

Melting process: 300~320°C 

Ash content:≤0.5% 


Volatile content:≤0.5% 

Fineness(300 mesh):100% 


Optical brightener KSN mainly be used in whitening of polyester, polyamide, polyacrylonitrile fiber, the plastic film and all plastic pressing process. Can suitable for synthesizing high polymer including polymeric process.