... 40g/cm3)8. Back PlateGalvanized plate, or aluminum plate, 0.5mm9.Surface Dimension(mm) :2000 *1000 *80 , ... 3+) ,enhance stability and absorbing rateCollecting heat by freeze-proof medium is more safeThermal efficiency decay ... commercial, buildings, hotels, hospitals, swimming pools 2.About Factory CapabilityWe supply the following collectors: ... hot selling split flat plate solar water heater collector