... ,ISO,CE 3,Available in various size 4.5days delivery 5.OEM available 1, Vacuum tube is consists of two layer ... can resist impact from hail up to 25mm in diameter.5, The inner tube is also made of quartz sand, but ... -N/AlAl-N/AlAbsorptance(AM1.5)≥0.89≥0.89Emittance≤0.0880≤0.0880VacuumP≤5*10-3PaP≤5*10-3PaStagnation parameter≥230/KW ...