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PEEK is an acronym, which stands for polyetheretherketone. PEEK is a hard, yet slightly flexible polymer that is used in the manufacturing of many fittings and tubing commonly used in the HPLC industry. It has excellent chemical resistance to organic and inorganic liquids; only concentrated sulfuric acid and concentrated nitric acid will chemically attack it. PEEK tubing is not recommended for use with methylene chloride, DMSO, or THF due to a physical swelling effect. However, these chemicals do not adversely affect fittings, unions, or tees. Because of its broad range chemical resistance and ability to hold high pressures, it is an ideal product for nuts, ferrules, unions, and tubing. Please Note: The maximum recommended operating temperature for PEEK fittings is 150°C, and for tubing it is 100°C.