... Keymark ,SRCC Vacuum tube with heat pipe consists of two glass tubes outer tube and inner tube Outer tube is made of ... Low heat reflection properties: < 0.86% Main types of vacuum tube: 47 x 1, 500, 58 x 1, 800, 70 ... 58 x 1, 800mm Three target vacuum tube Absorptive coating property structure of vacuum tube: Cu/SS-ALN(H)/SS- ... of pressure collector Pressure bearing: 0.6Mpa Vacuum Tube with Heat Pipe