Material of glass: Borosilicate Glass 3.3

Material of coating: AL-N/AL

Vacuum(pa):P≤5×10-3                                                                                                                                                Absorptance(%)≥90 
Emittance (%)  ≤9

 Heat-loss coefficient ≤0.85W/(M2℃)

Pressure-endure ability: 0.6MPa

Bearing hailstone ability: hailstone ? 25mm