... Solar Vacuum Tube performance and specification:Single Target magnetron sputtering plating 1. Single target tubeSingle-target vacuum tube performance and specification:Tube ... 58±0.7mm; Glass thickness 1.6±0.15mm Tube length1200mm,1500mm,1600mm,1800mm,1900mm,2000mm,2100mm etcAbsorption coatingpropertyCoating ... Hail resistanceØ25 mmPressure-endure1MPa All glass vacuum tube for solar water heater