PEEK (polyetheretherketone) connectors, tubing, and unions find extensive use in both Gas Chromatography-Mass Spectrometry (GC-MS) and High-Performance Liquid Chromatography (HPLC) systems due to their exceptional chemical resistance, temperature stability, and compatibility with a wide range of solvents and samples. Let's explore the different types and sizes of PEEK connectors, tubing, and unions commonly employed in GC-MS and HPLC applications.
Connectors:
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PEEK Ferrule Type Connectors: Ferrule type connectors are widely used in both GC-MS and HPLC systems. These connectors consist of a PEEK body and one or two ferrules, typically made of stainless steel or PEEK. The ferrules provide a compression seal when tightened around the tubing, ensuring a secure and leak-free connection. PEEK ferrule type connectors are available in various sizes, such as 1/16 inch and 1/8 inch, to match the corresponding tubing dimensions.
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PEEK Finger Tight Type Connectors: Finger tight type connectors offer a quick and tool-free assembly. They feature a unique finger-tightening mechanism that allows users to secure the connection by hand, without the need for additional tools. These connectors are particularly useful in applications that require frequent column changes or system modifications. PEEK finger tight type connectors are available in different sizes, accommodating various tubing dimensions.
Tubing:
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PEEK Tubing: PEEK tubing is widely utilized in GC-MS and HPLC systems due to its excellent chemical resistance, high-temperature stability, and low extractable properties. PEEK tubing is available in different sizes, including 1/32 inch, 1/16 inch, and 1/8 inch outer diameter (OD), catering to different flow rate requirements. The selection of tubing size depends on the specific application, system design, and desired flow characteristics.
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Fused Silica Capillary Tubing: Fused silica capillary tubing is predominantly used in GC-MS systems for capillary gas chromatography. It features a small inner diameter, typically ranging from 10 to 320 μm, allowing for high-resolution separations and low sample volumes. Fused silica capillary tubing is highly flexible and can be coated with a protective layer, such as polyimide, to enhance durability.
Unions:
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PEEK Ferrule Type Unions: Ferrule type unions with PEEK ferrules are commonly used in both GC-MS and HPLC systems. These unions ensure reliable and leak-free connections between tubing and various system components. PEEK ferrule type unions are available in different configurations, including straight unions, elbow unions, and tee unions, to accommodate different system designs and fluidic requirements.
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PEEK Finger Tight Type Unions: Finger tight type unions with PEEK construction offer convenient and tool-free assembly. These unions feature a finger-tightening mechanism that allows for quick and reliable connections without the need for additional tools. PEEK finger tight type unions are available in various sizes, ensuring compatibility with different tubing dimensions and system configurations.
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PEEK Tee Type Unions: Tee type unions enable the connection of three tubing lines at a single junction point. They are commonly used in applications where fluid merging or splitting is required, such as sample introduction systems or parallel column configurations. PEEK tee type unions come in different sizes to accommodate various tubing dimensions and flow rate requirements.
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PEEK Cross Type Unions: Cross type unions allow for the connection of four tubing lines at a central point. They feature a cross-shaped configuration and find application in complex fluid routing scenarios. PEEK cross type unions are available in different sizes, providing flexibility in system design and integration.
The choice of PEEK connectors, tubing, and unions in GC-MS and HPLC systems depends on several factors, including the specific analytical requirements, compatibility with solvents and samples, system pressure and temperature limits, and ease of installation and maintenance. Manufacturers and suppliers offer a wide range of PEEK-based components in different types and sizes to meet the diverse needs of chromatographic applications.