1.glass tube material: borosilicate glass 3.3 ,use LINO vacuum tube.
2.absorptive coating: graded AL-N-AL selective absorption.
3.vacuum degree: P<5* 10-3 PA
4.thermal expansion: 3.3*10-6/0C
5.insolation temperature: >2000C
6.absorptance: >93%
7.emissivity: <8%
8.resist cold: -350C
9.resist hailstone: diameter 25mm
10.resist wind: 30m/s
11.start-up temperature: <250C
12.life time: 15 years
13.unit tube weight: 1.3 kg for 47*1500 , 2.2 kg for 58*1800 .
14.copper pipe thickness: 0.7mm
15.glass thickness: 1.6mm
16.Package:carton
17.Head tube: copper.
18.Material of connect box: SUS304-2B stainless steel.
19.Heat Preservation Layer: Rock wool with 30mm thickness.
20.Material of supporter: stainless steal profile bar ,with 1.2mm thickness.