... Manufacturer Product name : Three-high Solar Vacuun TubeCharcater feature:It apply the technology of Three-target Magnetron Sputtering ,it ... , Φ58-1800mm, Φ58-2000mm, Φ58-2100mm.Outer tube diametre:Φ47±0.7mm; thickness: δ=1.6mm Φ58± ... Gold purpleVacuum degree: P≤4.2×10-3(Pa)Solar absorption efficiency: α=0.90-0.93(AM1.5 ... time: Within 2 weeks after paymentPayment : TT Three-target Solar Vacuum Tube