solar vacuum tube

Features:1) Structure: all glass coaxial dual tubes2) Material: high borosilicate glass 3.33) Coating: Ss- C/CU high efficient selective absorptive coating and vacuum heat insulation could get higher heat and have high performance of absorptance and low reflection ratio and performing a strong heating ability. 4) Vacuum pressure: 5x 10-4 Pa.5) Usage life: 15 years.6) customized tube size is available.
solar vacuum tube