1.Very strong UV Absorpivity in the ultraviolet region (especially in 240-340nm) 2 .Very low vapor pressure ,prevents product from loss during processing . 3.No effect on the odor of the resins. 4.Very good compatibility with thermoplastic polymers owing to its octoxy substituent group, thus ensuring homogeneous distribution during processing. 5.High purity, no adverse effects due to impurties. 6.Very high heat resisitance,without significant degradation or volatility at proper extrusion temperature.