Three target all-glass vacuum tube

Advantages: high pressure withstanding ability high absorption efficiency low heat loss stable and ageing-resistant coating anti-freezing workability in tough weather 10 years warranty ISO9001:2008 certified Technical Specification Structure:Two concentric borosilicate glass Material: High Borosilicate 3.3 glass Glass thickness: 1.6mm Specification length:47*1800mm,58*1800mm Absorptance: 0.93-0.96(AM1.5) Emittance: 0.04 0.06(80oC±5oC) Vacuum degree: P≤5.0×10-3 (Pa) Stagnation temperature: 260 300oC Solar irradiation for obtaining a preset water temperature: H=3.7-4.2MJ(58mm) H=2.9-3.2MJ(47mm)