Features:
1) Apply for two layer 3.3 high borosilicate glass tube
2) The two layers glass tube, with the same axis is vacuumized between them, the
vacuum degree can reach 0.05pa
3) Coated with AL/N/AL selective absorbing coating material
4) High absorbing efficiency: the vacuum magnetic control sputtering selective
absorbing coating has high absorption coefficient of more than 93%, and the
emission coefficient around 6%
5) Long life: 15 years
6) High practicability: able to endure impact of hail less than 25mm in diameter with
high heat efficiency throughout the year
Packing: carton with foam
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