... 92-93.5% 2.Frame:6063TS Aluminium alloy Blue Sputtering Membrane Solar Flat Collector Product features1.Glass cover:3.2mm Low ... .1-1.5mm.3.Absorber:adapted Germany technology,blue sputtering membrane,absorption≥97%,emission(100°c)<3%.4.Header pipe:Red ... coefficient 4.5W(m.k).10.Advanced Germany blue sputtering membrane,integral panel soldering,assembly line process such advantage adopted to ...