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Double coating evacuated tube
Double coating evacuated tube is made of high borosilicate glass 3.3,which can with stand the hail resistance of steel ball (diameter 30mm) from the height of 450mm.
It is well known that raw material,coating material and vacuum degree are the three dominate factors which can estimate quality of the tube.Alll the evacuated process of our solar vacuum tube last more than 3 hours to ensure the excellent vacuum degree.
The coating of this tube is SS-C/Cu,which can not only guarantee high absoptivity of the tube,but it can also make sure that the life span of this tube could reach to 15 years or even longer.
Double coating solar evacuated tube