? From January to October 2020, our company has provided fluorescence ultraviolet UVA340 accelerated aging test service for 82 products for 18 customers free of charge, with a total test time of more than 80000 hours. At the same time, Yunnan Anning Natural Exposure Plant has provided natural exposure test for 10 customers, of which three customers have been exposed for more than 2 years. Through the comparison between the accelerated aging test in our laboratory and the natural exposure test in Yunnan, we have provided valuable anti-aging data support for customers' products in outdoor use and the reliability test of anti-aging masterbatch performance with our company. Thank all customers for their trust and support to our company.