A PEEK™ compound, using the material’s outstanding combination of strength, dimensional stability and inertness, is the material of choice for a scientific instrument application.
Rheodyne, Inc. Cotati, California, makes syringe loading sample injector valves. These are used for commercial high performance liquid chromatography (HPLC), a system that analyzes chemical compounds.
RTP 2201 (a modified/reinforced PEEK™) is used in the “stator” component of the sample injector valve. The part has six threaded tubing ports, allowing connection to other components of the HPLC system.
Conventional stators use stainless steel. With an inert PEEK™ stator, the sample fluid stream does not contact metal, so no metal ions contaminate the sample stream. The RTP compound provides reliable dimensional stability, critical to this application.
PEEK™ is also used for nut and ferrule fittings used to connect tubing to ports. These parts are subject to high pressure during injection of samples. The material and the design of the fittings ensure reliability at high pressure. The stator is approximately 1 3/8 inch in diameter and 1/2 inch thick.