We produce at presentF47, F58, F70 pipe diameters. The lengthes are 1.2m,1.5m,1.6m,1.7m,1.8m,2.0m, and 2.1m, AI--N/AI alternative absorption coating, the whole glass double tubes coaxial structure vacuum solar collecting superconductive hot tubes. Our products enjoy a high reputation both at home and abroad. Features: 1) Structure: all glass coaxial dual tube 2) Material: high borosilicate glass 3.3 3) Interferential coating: copper, aluminum nitride 4) Capabilities: a) Fast thermal collecting efficiency b) High heat resistance c) High cold resistance 5) Lift time: 15 years