solar power collector tube(Certification:ISO9001-2

solar vacuum tube,glass evacuated tube,solar power collector tube 1.Vacuum Tube 1).External pipe diameter :47mm/58mm/70mm Internal pipe diameter:37mm/47mm/58mm 2).Thickness:1.6mm/2.0mm 3).Length:1500mm/1600mm/1700mm/1800mm/1900mm/2000mm/2100mm 4).Material:high borosilicate 3.3 glass.5).Pass The Quality Supervision and Inspection2.HuaLi Solar Collector Features 1).Highly efficient absorber ,daily average efficiency over 50%2).Can be used all years round in the climate 3).Low heat loss 4).Stable coating plating technology 5).High heat resistanceand high cold resistance.(Certification:ISO9001-2000)