1.certificates:solar keymark,CE,SRCC,SGS,CCC 2.competitive price and good quality 3.Material:High borosilicate 3.3 glass.

Specification of triple target solar evacuated  tube:

The marerial of glass tube: hard borosilicate :3.3

The thickness of inner and outer tube of:1.6mm

Absorption coefficient: more than 93%

Absorptive coating :high efficient heat absorptive selective sputtering coating:

 SS-C/CU and AL-N/AL

Emission coefficient: less than 10%(8%)

Evacuated : less than  5*10-3pa

Stagnation temperature   220 degree Celsius

Hail resistance    25mm

Freezing resistance   -35 degree Celsius

solar vacuum tube