PEEK has been very successfully applied in the analytical testing instrument industry, solving many technical challenges; high-performance plastic parts such as PEEK fittings, PEEK chromatography column plugs, PEEK blade rings, PEEK two-way connectors, PEEK three-way connectors, PEEK luer connectors, PEEK digestion vessels, PEEK mixing tees, PEEK tubes, PEEK wall-penetrating two-way connectors, PEEK panel-mount connectors, PEEK high-pressure pump heads, PEEK biochip connectors, PEEK four-way connectors, PEEK valve heads, PEEK rotors, PEEK stators, and other PEEK external thread two-way connectors, machined from PEEK and its modified composite materials, can replace parts made from traditional materials like copper alloys, stainless steel, and ordinary engineering plastics. They meet the stringent technical requirements of analytical testing instruments for parts that are high-temperature resistant, corrosion-resistant, self-lubricating, high-strength, high-precision, and dimensionally stable, thereby reducing usage costs and enhancing the accuracy of equipment testing.