Product specialty:
Apply for two layers 3.3 high borosilicon glass tube
The two layers glass tube, with same axis is vacuumized between them, the vacuum degree can reach 5x10-2Pa.
Coated with AL/N/AL selective absorbing coating material
High absorbing efficiency: The vacuum magnetic -control sputtering selective absorptive coatings on the heat-collecting plates has a high absorption coefficient of more than 93%, and the emission coefficient around 6%.
Long life: The life span can reach 15 years.
High practicability: Able to endure impact of hail less than 25mm in diameter with high heat efficiency throughout the year.

Technical data table:
Model type Φ47x1.5m Φ58x1.8m
Outside-tube diameter Φ47 Φ58
Inner-tube diameter Φ37 Φ47
Wall thickness 1.5mm 1.5mm
Length 1.5mm 1.8mm
Outside-tube diaphaneity 0.92 0.92