All glass vacuum tubes are the key component of solar collectors. The vacuum tube is similar to a conventional Dewar flash and consists of two borosilicate glass tubes with high chemical and thermal shock resistance. The outer side of the inner tube is coated with a sputtered solar selective surface. This coated inner tube is closed at one end and sealed at the other end to the outer tube. The annular space between the outer tube and inner tube is evacuated to virtually eliminate heat loss by conduction and convection.

All-Glass Evacuated SS-ALN Cermet Solar Collector Tubes are manufactured by using the interference absorption type of solar absorption layer, and the technology of “metallic-membrane plating”, such as SS and Al duplex metallic target sputter manufactured Cermet absorption layer etc. It also adopts new interference absorption type of super low emission ratio and selective absorption membrane layer with absorptance ration α=0.96，emission ratio: ε≤0.06. Absorption layer possesses special stainless steel aluminum nitride with high temperature resistant. It will not shed even the glass has melted; also with characters of anti-damping, ageing-resistance and dry collection resistance, low emission ratio, small thermal losses. It can still produce hot water when it is 300 below, and with longer life.