Does anyone know what material the white plastic railings placed on the edge of Tianjin green space are made of? Better be specific!

It's probably PVC. Because the white fences and guardrails in China are basically PVC plastic. Simple identification method: the appearance is very close to the white door and window profile, so it must be PVC. If you can get the sample and burn it with a small fire, such as flame retardant and irritating gas, it will prove to be PVC plastic.