Features:
1) Typical Size: ¦µ47x1, 500mm / ¦µ58x1, 800mm / ¦µ70x2, 000mm
2) External tube diameter: ¦µ47+/-0.7mm, ¦µ58+/-0.7mm, ¦µ70+/-0.7mm
3) Internal tube diameter: ¦µ37+/-0.7mm, ¦µ47+/-0.7mm, ¦µ58+/-0.7mm
4) Thickness: 1.5mm+/-0.1mm, 1.7mm+/-0.1mm, 2.0mm+/-0.1mm
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: ¡Ü0.7W/(m²×ºC)
11) Pressure-endure ability: 1Mpa
12) Bearing hailstone ability: 25mm
13) Lifespan: 15 years
14) Widely used for solar water heater and solar collector project
15) Packing: export carton