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vacuum tube
Product Detailed
It has excellent performance, high quality ,reasonable price, long service life ,approved by CE,SRCC solarkeymark,ISO2008,EN1297
Thefeatures of the tubes
| Length | 1500mm | 1800mm |
| Outer tube diameter | 47mm | 58mm |
| Inner tube diameter | 37mm | 47mm |
| Weight | 1.3kg | 2.2kg |
| Glass thickness | 1.6mm | 1.6mm |
| Material | Borosilicate Glass 3.3 | Borosilicate Glass 3.3 |
| Absorptive coating | Graded A1/N/A1 | Graded A1/N/A1 |
| Vacuum degree | P<5*10 -3 Pa | P<5*10 -3 Pa |
| Thermal expansion | 3.3*10 -6 /°C | 3.3*10 -6 /°C |
| Insolation Temperature | >200°C | >200°C |
| Absorptance | >93% | >93% |
| Emittance | <8% | <8% |
| Heat loss | <0.8W/(m2°C) | <0.8W/(m2°C) |
| Maximum strength | 0.8Mpa | 0.8Mpa |
| Resist cold | -35 °C | -35 °C |
| Resist hailstone | Ø 25mm | Ø 25mm |
| Resist wind | 30m/s | 30m/s |
| Start-up temperature | <=25°C | <=25°C |
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