Coating material: AL-N/Al,sputtering Glass thermal expansion coefficient: 0.0000033/oCGlass tube thickness:1.6mm±0.2Glass material:Borosilicate Glass 3.3Absorption ratio(AM1.5):>0.93Emittance Ratio(80oC)<0.062Stagnation Parameter:Y≥242m²oC/kWStagnation Temperature:240oCAverage Heat loss coefficient:Ult=0.79W/m²oCHail resistance:OK for hailstone sized under 25mm in diameterSolar radiance exposure:H<2.64MJ/m²Vacuum Pressure:P<0.049PaContainer Loading:4800pcs/20',400ctn/40'Packing: 24pcs/ctn

All-Glass Evacuated Solar Collector Tube