PEEK Tubing

Quick Look

  • 1/16” or 1/8” outside diameter available
  • Biocompatible, inert, and easily cut
  • Great for high-pressure applications
  • Maximum continuous use temp: 100 ºC

The importance of PEEK in modern instrumentation

PEEK (polyetheretherketone) polymer tubing is biocompatible, chemically inert to most solvents, and can be used to replace stainless steel tubing in most liquid analytical systems. Unlike stainless steel tubing, PEEK tubing is flexible and can be easily cut to the desired length. PEEK tubing has a very smooth inner surface that causes less turbulence than metal tubing of similar size, which contributes to better resolution of sample bands.

Of all the polymer tubing materials offered, PEEK is the least permeable to gas.

Capillary PEEK Tubing

  • 360 μm or 1/32″ outside diameter available
  • IDs as small as 25 μm (0.001″)

Capillary PEEK tubing offers all the benefits of larger sized PEEK tubing, while serving as an excellent alternative to more traditional fused silica and stainless steel capillary tubing. The capillary tubing can be coupled to many of the products in the Connectors category and Valves category.


Because the thru-hole of 25 µm ID PEEK tubing is very small, it is possible for some fittings to cause the ID to become occluded. Please use caution, especially with wrench-tightened fittings. For more information, please contact us.

What Size PEEK Tubing Should I Use?

  • It is usually safe to use 1/16″ OD x 0.010″ ID tubing throughout an analytical HPLC system. With a 0.010″ It is usually safe to use 1/16″ OD x 0.010″ ID tubing throughout an analytical HPLC system. With a 0.010″ ID, the pressure drop across most tubing lengths is negligible,and the ID is small enough to minimize band broadening.
  • High-pressure semi-prep LC systems will most likely use 1/8″ OD tubing. Use our 1/32″ OD tubing for the high-pressure flow path of some microbore HPLC systems.
  • Choose 360 µm OD tubing for most capillary systems.
  • PEEK tubing is also available by inch. Contact us as your local Distributor for pricing information.

Improve your chromatographic performance

An independent study conducted by a major pharmaceutical company indicated LC-MS chromatographic performance could be improved in some cases by switching the post-column transfer line from fused silica to PEEK polymer tubing. The switch dramatically reduced peak tailing and eliminated the degradation of peak symmetry as injection volume was reduced.


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