Why can WPC doors can flame retardant?

Since the WPC door is manufactured under high temperature and high pressure environment, it will not support combustion when it encounters fire, and has good flame retardancy and other characteristics. It should be noted that flame retardant does not mean that it can be used as a fire door. In case of fire or other situations, the WPC door is easy to soften when encountering high temperature, so it cannot be directly used for fire doors.