SIS - Poly Ether Ether Ketone (PEEK) Tubing

Its strength and inertness make PEEK (poly ether ether ketone) the obvious substitute for stainless steel when biocompatibility is an issue. SIS offers two types of PEEK tubing: Solid color coded tubing. Natural tan tubing with a color coded stripe. The striped material is recommended for maximum chemical resistance and biocompatibility, as the dye used for the stripe never comes in contact with the fluid stream. PEEK is very chemically resistant and can withstand halide salts and buffers of high ionic strength which can degrade stainless steel. PEEK does not contribute metal ions or provide protein binding sites the way stainless steel can. Certain organic solvents including methylene chloride, DMSO and THF will cause PEEK to swell and will result in lower burst pressure. Concentrated nitric and sulfuric acids will attack the polymer, although 30% nitric acid may be used for passivating.