FEP/PTFE or PTFE.

• Chemically inert inner FEP PTFE tube carries the mobile phases
• Non-wetted outer wall is made from a translucent, flexible polymer with extremely low gas permeability
• Cuts regassing rates to negligible levels while preserving PTFE’s excellent chemical resistance, transparency and handling properties
• Bends easily to fit your system’s layout and cuts easily with a razor blade or plastic tubing cutter
• Translucent wall lets you see the tubing’s interior for fast, simple troubleshooting
• NO-OX fitting connects in seconds

Even if you thoroughly degas your mobile phase by helium sparging, vacuum filtration, sonication or in-line vacuum degassing, the mobile phase will not stay degassed if PTFE tubing is used to deliver it to the pump. That’s because PTFE is gas-permeable and allows ambient gases, such as oxygen, to diffuse through the tubing wall and into the mobile phase. The amount of ambient gas that enters the mobile phase depends on the tubing dimensions and mobile phase flowrate, but no matter how well you have degassed, some oxygen will re-enter the mobile phase on its way to the pump, possibly detracting from system performance. NO-OX tubing solves this problem with a unique double-wall design that eliminates regassing.