It is made by increase the ratio of wall thickness to outside diameter, and adjust the mechanical properties to get the features obtaining ultra-high pressure resistance. Ultra-high Pressure : 0.1 0.37 , Work Pressure :10000 ~ 20000 Psi Required Pressure :10000 ~ 60000 Psi ¨ Nuclear electric tubes,Small diameters tubes,capillary tubes,thin wall tubes,high temperature alloy tubes,refractory metal seamless tubes OD: 2.5mm ~ 16mm ± 0.03 WT: 0.15mm ~ 1mm ± 0.03 For specific od,wt,length,tolerance and roughness can be negotiated by details requriements.