solar vacuum tube

1.material :High-quality borosilicate glass. 2.assimilate the advanced 9 layers of spattering deposition of trivalent element technology, Inner coating of tubes consists of layers of copper, stainless steel and aluminium nitride .3.advanced filming technology .4. Through the interlayer, vacuum has a unique effect of thermo, with its temperature up to 380 degrees of idle sunning.5. high performance of absorptance ( more than 96% )and low reflection ratio( less than 0.056/20º C).6. size (Diax Length) : 47 x 1,500mm, 47 x 1,800mm , 58 x 1,800mm,58 x 2,100mm.