optical brightening agent             

1.Properties:
Appearnace:bright yellow crystalline powder                        
Melting point:357-359°C
Solubility:Insoluble in water,but soluble in high boiling point organic solvents such as phenyl-chloride.
Structure:a compound of diphenylethylene bisbenzoxazole type                                                

2.Applications:                                                                                                                                                                                                         FWA OB-1 is especially suitable for shaping various kinds of plastics and their products under high temperature.It has an extra ideal whitening effect on polyester-cotton blend fabric.It can be used for whitening polyester melt.This whitening agent is similar to Whitex SNK,Uvitex ERT and Eastobrite OB-1 made in foreign country.               

3.Directions for use and dosage:                                      
The dosage should be 0.01-0.05% on weight of plastic or polyester granules.Mix the materials thoroughly before shaping of the plastic products or drawin-spinning of polyester fibers.     

5.Packaging            
Packaged in cardboard boxes,25kg or 50kg each,Stored in dry and ventilated place.