Specifications: Configuration: *Solar selective absorbing coating, Technology---Graded AI-N/AI selective surface, sputtering *Solar absorptance---0.88~0.94 *Emittance (80篊)---0.08~0.04 *Vacuum Jacket Pressure---*Typical stagnation temperature--->260篊 *Impact resistance---Withstand hailstone of 25 mm in diameter *Strength (Pressure tested)---0.6MPa Vacuum tube specs: