PEEK (polyetheretherketone) union connectors are widely used in High-Performance Liquid Chromatography (HPLC) and Gas Chromatography-Mass Spectrometry (GC-MS) systems to provide reliable and leak-free connections between various fluidic components. These connectors are available in different types, each with its unique design and features. Let's explore some of the common types of PEEK union connectors used in HPLC and GC-MS applications:
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Ferrule Type Union Connectors: Ferrule type union connectors are one of the most widely used types in chromatography systems. They consist of a PEEK body and one or two ferrules, which are usually made of stainless steel or PEEK. The ferrules provide a compression seal when tightened around the tubing, ensuring a secure connection and preventing leakage. Ferrule type connectors offer easy installation and removal, making them convenient for routine maintenance and column changes. They are compatible with different tubing materials, such as PEEK, stainless steel, and fused silica capillary tubing.
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Finger Tight Type Union Connectors: Finger tight type union connectors are designed for 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 any tools. These connectors are particularly useful in situations where rapid column changes or system modifications are required. Finger tight type connectors provide a reliable and leak-free seal when properly tightened and are compatible with various tubing materials.
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Tee Type Union Connectors: Tee type union connectors, as the name suggests, have a T-shaped design. They enable the connection of three tubing lines at a single junction point. Tee connectors are commonly used in applications where multiple lines need to be merged or split, such as sample introduction systems or parallel column configurations. The PEEK body of the connector typically has multiple ports for tubing insertion, and each port is sealed using ferrules or other compression fittings.
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Cross Type Union Connectors: Cross type union connectors are similar to tee connectors but with an additional port, resulting in a cross-shaped configuration. They allow the connection of four tubing lines at a central point. Cross connectors are useful in applications that require complex fluid routing or the combination of multiple sample streams. The PEEK body of the connector has four ports for tubing insertion, and each port is sealed using ferrules or compression fittings.
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Capillary Union Connectors: Capillary union connectors are specifically designed for use with capillary tubing, which has a small inner diameter (ID). These connectors are used in applications that require high-resolution separations or low-flow rates, such as nano-LC or capillary electrophoresis. Capillary union connectors provide a secure and leak-free connection for capillary tubing, ensuring precise and accurate sample handling.
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Union to Threaded Fitting Connectors: Union to threaded fitting connectors are used to connect PEEK tubing to threaded ports or fittings, such as detectors, pumps, or injectors that have male threads. These connectors typically have a PEEK body with a compression-style union on one end and a threaded connection on the other end. They provide a reliable and leak-free connection between PEEK tubing and threaded components, allowing for seamless integration into the chromatography system.
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Union to Compression Fitting Connectors: Union to compression fitting connectors offer a transition between PEEK tubing and compression-style fittings. Compression fittings are commonly used with stainless steel tubing, and these connectors allow for the connection of PEEK tubing to such fittings. They typically have a PEEK body with a compression-style union on one end and a compression fitting on the other end. Union to compression fitting connectors ensure a tight and secure connection between PEEK tubing and compression fittings, providing compatibility between different tubing materials.
It is important to note that while PEEK union connectors provide excellent sealing and compatibility with various tubing materials, it is crucial to select the appropriate type of connector based on the specific application, tubing size, and system requirements. Manufacturers and suppliers offer a wide range of PEEK union connectors to accommodate the diverse needs of HPLC and GC-MS systems, enabling scientists and technicians to achieve reliable and efficient fluidic connections.