LC-SCF-1.5/2.0 Flat solar panel 1,high heating efficiency 2,easyly installation, energy-saves 3,competitive price LC-SCF-1.5/2.0 Flat solar panel Collector (1.5m2) Operation Pressure : 4BarTesting Pressure : 8BarCasting: Anodized AluminumInsulation material 40mm Glass wool layerGlazing: Normal float 4mmAbsorber coating: Aluminu-copper complex Ultrasonic welding selective oxidation (Black paint) ...