Transparent Borosilicate Glass Vacuum tubes consists of two glass tubes outer tube and inner tube Outer tube is made of extremely strong transparent borosilicate glass and adopted magnetism control Inner tube is made of borosilicate glass 3.3Absorptive coating property:AL/AL-ALN(H)/AL-ALN(L)/ALN Expansion Coefficient:3.3 x 10-6Hardness:7Excellent solar heat absorption Intercept efficiency: > 93% Low heat reflection properties: < 0.86% Main types of vacuum tube: 47 x 1,500, 58 x 1,800, 70 x 2,000 and 70 x 2,100mm Stagnation temperature: 180 to 190 degrees Celsius Heat insulating time: 72 to 80 hours Hail resistance: 25mm
vacuum tube
