Double Desk And Chair,Double School Desk,Double Table Chair,Double School Table AU-PINY FURNITURE CO., LTD , https://www.au-piny.comThis standard specifies an artificial climate aging test method that uses fluorescent ultraviolet lamps and condensation devices to simulate natural weather such as solar ultraviolet light, temperature, and condensate. This standard applies to the weather resistance test of vulcanized rubber exposed to alternating conditions of ultraviolet light and condensation. Beijing Hengtai Fengke Test Equipment Co., Ltd. http: //