... technology,blue sputtering membrane,absorption≥97%,emission(100°c)<3%.4.Header pipe:Red copper tube(TP2)DN22x0.8,copper ... charater:momentary efficiency can reach 0.87,heat loss coefficient 4.5W(m.k).10.Advanced Germany blue sputtering membrane, ... panel soldering,assembly line process such advantage adopted to prove flat collector higher quality and production capacity than traditional technics.11 ...