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58/1800 solar vacuum tube
Specifications:
Outer tube diameter: 58+/- 0.7mm
Outer tube thick: 1.6mm
Inner tube diameter: 47+/-0.7mm
Inner tube thick: 1.6mm
Tube length: 1810mm
Material: borosilicate glass 3.3
Coating structure: Cu/ALN-SS/ALN, three target
Absorption: 93%
Emission: 4%
Production flow: