... technology that the connection with aluminium fan among heat pipe reduces the heat transfer system of thermal. resistance, ... 15 years. StructureAll-Glass Double Tube Co-Axial StructureGlass MaterialHigh Borosilicate 3.3 GlassExternal Pipe Diameter & Thicknessdia.=47±0 ... .5mm &=1.6mm,dia.=58±0.5mm &=1.6mm, Pipe Length1500mm, 1600mm, 1700mm, 1800mm, 1900mm, 2000mmAbsorptive Coating PropertyStructureCu ...