UV-1577, as the ultraviolet absorber, works as the UV absorber in acrylate, PVC, PS, PE, etc. Appearance: Light yellow powderPurity (by HPLC): 99.0% minMelting Point: 147-149 Deg CVolatile: 0.1% maxColor of solution at 450nm: 87.0% min 500nm: 98.0% minColor of solution (250 Deg. C) at 450nm: 80.0% min 500nm: 90.0% min UV absorber 1577