Technical parameter
external pipe diameter and thickness		φ=47±0.7mm &=1.6mm φ=58±0.7mm &=1.6mm φ=70±0.7mm &=2.0mm
internal pipe diameter and thickness		φ=37±0.7mm &=1.6mm φ=47±0.7mm &=1.6mm φ=58±0.7mm &=1.6mm
pipe length		800mm, 1200mm, 1500mm, 1600mm, 1800mm,1900mm, 2000mm, 2100mm
Vacuum tightness		P≤5.0×10-3 Pa
Average heat loss coefficient		ULT=0.4~0.6W(m2.oC)