PEEK is used for a variety of different HPLC parts and accessories. PEEK is a good choice because it is relatively inexpensive, resilient to most chemicals, and does not interact with peptides and proteins. PEEK tubing is flexible and easy to fit, PEEK fittings will not damage equipment and end fittings when overtightened. Chemical compatibility PEEK is not suitable for concentrated nitric or sulfuric.
PEEK is suitable for most solvents and salts.
A complete listing of chemical compatibility is available. When using tubing at higher temperatures, the maximum pressure can be less than at room temperature. Biocompatibility PEEK is a general name for a series of polymers. Typically, higher molecular weight PEEK is used in fittings, lower in tubing. There are two ways to keep the curve shape in hte tubing.