Features:
1) Typical Size: Φ47x1, 500mm / Φ58x1, 800mm / Φ70x2, 000mm
2) External tube diameter: Φ470.7mm, Φ580.7mm, Φ700.7mm
3) Internal tube diameter: Φ370.7mm, Φ470.7mm, Φ580.7mm
4) Thickness: 1.5mm0.1mm, 1.7mm0.1mm, 2.0mm0.1mm
5) Tube length: from 1.2m to 2.1m
6) Glass material: borosilicate glass 3.3
7) Absorbing coating properties: AL-N/AL or Al N/Al N-SS/Cu selective absorbing coating
8) Absorptance: 0.92
9) Emittance: 0.07
10) Heat loss coefficient: ≤0.70W/(m²x℃)
11) Pressure-endure ability: 1Mpa
12) Bearing hailstone ability: 25mm
13) Lifespan: 15 years
14) Widely used for solar water heater
15) Packing: export carton