Structure

All glass coaxial double-layer tubes

Material of glass

Borosilicate Glass 3.3

Material of coating

Graded Al-N/Al selective surface, sputtering

Outer tube diameter

& thickness

?=47±0.7mm， &=1.6 ± 0.15 mm

?=58±0.7mm， &=1.8 ± 0.15 mm

Inner tube diameter

& thickness

?=37±0.7mm ，&=1.6 ± 0.15 mm
?=47±0.7mm ，&=1.6 ± 0.15 mm

Length of tube

1500（±5mm）,1800（±5mm） 

Vacuum

P≤5×10 -3 pa

Absorptance

≥0.90

Emittance(100℃)

≤ 0.09

Heat-loss coefficient

≤0.85W/(M 2 ℃)

Pressure-endure ability

1MPa

Bearing hailstone ability

hailstone diameter Ф 25mm

Useful time

15years