PEEK shows outstanding resilience to numerous organic and inorganic compounds. Most of the solvents used in high-performance liquid chromatography (HPLC) are compatible with PEEK. Concentrated nitric and sulphuric acids are the only solvents that can attack PEEK (Properties of PEEK, polyetheretherketone, n.d.). However, it is possible for PEEK tubing passivating a system to endure 20 to 30% nitric acid.
Other chemicals such as dimethyl sulfoxide (DMSO), methylene chloride, and tetrahydrofuran (THF) can cause puffiness in PEEK. At temperatures of 200Â oC, PEEK has high-quality resistance to chemicals such as sodium hydroxide solution, liquid ammonia, sulphur dioxide gas, carbon monoxide gas, methane, 50 % ethylene glycol, and phosphoric acid (Properties of PEEK, polyetheretherketone, n.d.). At low temperatures of 20Â oC, PEEK displays superior resistance to chemicals such as acetic acid, acetaldehyde, anhydrous ammonia, aromatic hydrocarbons, boric acid, calcium hydroxide, and cyclohexanone among many others (Properties of PEEK, polyetheretherketone,Â n.d.). However, it is not recommended to use PEEK at 20Â oC in chemical solutions containing bromine, aqua regia, liquid chlorine, 100% nitric acid, phenols, and sulphuric acid (Properties of PEEK, polyetheretherketone, n.d.).
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