http://www.sunecochina.com/solar/VacuumSolarTubes.htm
Chinese Supplier of High Quality of Solar Water Heater and Vacuum Tube
First Process: Automatic Cropping Process
Second Process: End Rounding and Exhaust Tube connecting Process
Third Process: Water Purifying, Tube Cleaning and Drying Process
Forth Process: Filming Process
Fifth Process: Sealing Process
Sixth Process: Vacuumizing Process
Seven Process: High-frequency and annealing process
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