Hello, the advertising light box panel of Guangzhou Metro is made of PC light diffuser, which belongs to a kind of PC board. The raw material is PC (polycarbonate). Polycarbonate (PC) is a polymer with carbonate groups in its molecular chain. Because of its special structure, polycarbonate has become the fastest-growing general engineering plastic among the five engineering plastics.

From the end of 20 15 to the beginning of 20 16, the advertising light box panels of Guangzhou Metro were basically replaced with new ones, and all of them used "Yuemei" brand PC light diffusers. Guangzhou Yuemei, a cooperative manufacturer of PC boards, is a professional manufacturer of PC boards, located near Guangzhou Baiyun Airport, and Yuemei is one of the top ten PC board brands in China.

If necessary, you can search and contact the manufacturer yourself to find out. I hope it will help you and be adopted. Thank you!