Polyetheretherketone or PEEK tubing comes in many different colors and dimensions and is used for LC systems.
Blue: OD 1/16 inch ID 0.010 inch (0.25 mm) Phenomenex Part Number: AT0-1107
Yellow: OD 1/16 inch ID 0.007 inch (0.175 mm) Phenomenex Part Number: AT0-1260
Red: OD 1/16 inch ID 0.005 inch (0.125 mm) Phenomenex Part Number: AT0-1259
These tubings are pressure tested up to 7000 psi and can be used at pressures of 5000 psi and 100C for continuous use. They are chemically inert to virtually all HPLC solvents and also biocompatible. Only running solvents of 100% Methylene chloride, THF, concentrated nitric or sulfuric acid will affect the PEEK tubing.
Other dimensions and colors that you may encounter on an LC are:
Natural:OD 1/16 inch ID 0.015 inch (0.40 mm)
Orange: OD 1/16 inch ID 0.020 inch (0.50 mm)
Green: OD 1/16 inch ID 0.030 inch (0.76 mm) rated only to max of 1000 psi
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