solar vacuum tubes

Vacuum tubes assimilate the advanced 12 layers of spattering deposition of trivalent elements, high borosilicate glass, gradual change of SS-AL/CU selective complex absorptive coating and these make vacuum tubes have high performance of absorptance and low reflection ratio. Through the interlayer, vacuum has a unique effect of thermo, with its temperature up to 380 degrees of idle sunning, performing a strong heating function.
Features:
1) Structure: all glass coaxial dual tube
2) Material: high borosilicate glass 3.3
3) Interferential coating: copper, aluminum nitride
4) Capabilities:
a) Fast thermal collecting efficiency
b) High heat resistance
c) High cold resistance
5) Life time: 15 year