three-high vacuum tube

Product Name: Three-highs vacuum tube
Model Number: THVT
Place of Origin: China
Structure: All glass concentric dual tube structure
Glass material: Borosilicate glass
Outer tube diameter and thickness: 58+/-0.7mm/1.6mm
Inner tube diameter and thickness: 47+/-0.7mm/1.6mm
Length of tube: 1800(+/-5mm)
Construction: Graded AL-N/AL selective absorption coating
Heat-absorbing rate: More than 92%
Emission of heat: Less than 8% (80degree)
Vacuum degree: Less than 0.005Pa
Solar radiance exposure: Less than 2.8MJ/M2
Calories absorption: 9.1MJ/M2
Average heat loss: Less than 8.6W/(M3. K)
Pressure-endure ability: 1Mpa
Bearing hailstone ability: 25mm in diameter
Lifespan: 15years