cooper coated solar vacuum tube/aluminum solar tubes

solar water heater vacuum tube:
1.High efficiency,high quality.
2.ensure operation in winter
3.15years' warranty for tube

we do business on the basis of honesty, responsibility!
Certificate: ISO9001-2000,CE, CCC.
High Efficiency Solar Vacuum Tube technology:

Material apply for high 3.3 borosilicate glass
Models Φ47/Φ58/Φ70
Structure all-glass-coaxial double-layer tubes
outer tube diameter 47±0.7mm &=1.6mm
58±0.7mm &=1.6mm
70±0.7mm &=2.0mm
inner tube diameter 37±0.7mm &=1.6mm
47±0.7mm &=1.6mm
58±0.7mm &=1.6mm
Length: 800/1200/1500/1600/1800/1900/2000/2100mm.
Absorptance 0.93~0.96
Emittance 0.04~0.06(80°C ±1.5°C)
Transmittance of outer tube 0.91
Stagnation temperature(height) 280~300°C
Pressure-endure 1Mpa
Stable advanced coating up to 420
Main Advantages of SG Collector Tubes:
1.No scaling
2.No blasting
3.water-tight
4.Anti aging
5.low temperature-resistant
6.high temperature-resistant
7.fast heat transfer
8.high heat conductivity
9.bearing pressure