Optical Brightener OB-1

Chemical Name:


Formula C28H18N2O2  
MW      414
CAS# 1533-45-5

Synonym name:

Fluorescent Brightener 393 (FB 393 ) , C.I.393,  Fluorescent Brightener OB-1, Eastobrite OB-1


Appearance yellowish or greenish  powder, two color shades
Melting point 357-359℃
Solubility (g/100 g solution) at 20° C:
Acetone <0.1
Chloroform <0.1
Hexane <0.1
Methanol <0.1
Water <0.1


OB 1 has low volatility and excellent heat resistance which make the product ideal for use in fibers and in engineering plastics processed at high temperatures.

OB 1 has two colors shades, greenish and yellowish color shade.

>Recommended concentrations:0.005-0.2% depending on the application and degree of desired whiteness.

Handling and Safety: 

>FDA cleared for use in all polymers

>For additional handling and toxicological information, please consult us for Maternal Safety Date Sheet.


25kg per fiber drum with PE liner, 6*2 layer 12 drums per pallet, 5 CBM per ton, or according to customers’ requirements.


Eastobrite OB-1, Optical Brightener OB-1, CAS 1533-45-5, FBA 393 tds

Eastobrite OB-1, Optical Brightener OB-1, CAS 1533-45-5, FBA 393 msds

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