... a polyethylene core. 2,The outdoor aluminum compound is coated with polyvinylidene difluoride(PVDF) resin to withstand even the ... process,results in an effective barrier against corrosion,alkali,UV,sunlight,humidify,salf,tropical weather and freezing weather climates ... conditions. 7,Coating evenness and multiple colors:all our panels are finishsed with a continuous high precision rolling techniques ...