Optical brightener OB1 (OBA 393)   
C.I.: 393   
CAS NO. 1533-45-5   
Appearance: Bright yellowish green crystal powder   
Purity: 99.1 % min   
Melting point: 359℃   
Usage: A good whitening agent for plastics and polyester their products under high temperature.   
Package: 25KG fiber drums with PE liner.   
Counter of Eastobright OB-1 (Eastman).