Features:
1) Outer tube diameter: 47 / 58mm
2) Inner tube diameter: 37 / 47mm
3) Glass thickness: 1.6mm
4) Length: 1.5 / 1.8m
5) Material: borosilicate glass 3.3
6) Absorptive coating: graded Al-N / Al
7) Vacuum: <5 x 10 - 3Pa
8) Absorptance: >92% (AM1.5)
9) Emittance: <8% (80°C)
10) Thermal expansion: 3.3 x 10 - 6°C
11) Stagnation temperature: > 200°C
12) Heat loss: <0.8W/m²
13) Maximum strength: 0.8MPa
14) Hailstone resistance: up to 25mm in diameter
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