In the realm of high-performance liquid chromatography (HPLC) and other analytical techniques, the choice of tubing can significantly impact the accuracy and reliability of results. Polyether ether ketone (PEEK) tubing has emerged as a preferred material, offering a blend of mechanical strength and chemical resistance. This article delves into the advantages of PEEK tubing, particularly the 1/16” outer diameter (OD) variant, and provides guidance on selecting the appropriate inner diameter (ID) for various applications.
The Importance of Tubing Selection in Analytical Applications
Selecting the right tubing is crucial in analytical setups. It ensures:
• Chemical Compatibility: Prevents reactions between the tubing material and solvents or samples.
• Pressure Resistance: Withstands the operational pressures of the system without deformation.
• Dimensional Accuracy: Maintains consistent flow rates and minimizes dead volumes.
Advantages of PEEK Tubing
PEEK tubing stands out due to its:
• High Mechanical Strength: Capable of withstanding pressures up to 400 bar, making it suitable for high-pressure applications.
• Chemical Resistance: Inert to most solvents, reducing the risk of contamination and ensuring the integrity of analytical results.
• Thermal Stability: With a melting point of 350°C, PEEK tubing remains stable under elevated temperatures.
• Biocompatibility: Suitable for applications involving biological samples, ensuring no adverse interactions.
Understanding 1/16” OD PEEK Tubing
The 1/16” OD is a standard size in HPLC systems, compatible with most fittings and connectors. This standardization simplifies system integration and maintenance. The choice of inner diameter (ID) is pivotal, as it influences flow rates and system pressure.
Selecting the Appropriate Inner Diameter
PEEK tubing is available in various IDs, each catering to specific flow requirements:
• 0.13 mm ID (Red): Ideal for low-flow applications where precise control is essential.
• 0.18 mm ID (Natural): Suitable for moderate flow rates, balancing pressure and flow.
• 0.25 mm ID (Blue): Commonly used in standard HPLC applications.
• 0.50 mm ID (Yellow): Supports higher flow rates, suitable for preparative chromatography.
• 0.75 mm ID (Green): Used in applications requiring substantial flow without significant pressure buildup.
• 1.0 mm ID (Grey): Ideal for very high flow applications, minimizing backpressure.
When selecting the ID, consider the viscosity of your solvents, desired flow rates, and system pressure limits.
Best Practices for Using PEEK Tubing
To maximize the benefits of PEEK tubing:
• Avoid Certain Solvents: PEEK is incompatible with concentrated sulfuric and nitric acids. Additionally, solvents like DMSO, dichloromethane, and THF can cause tubing expansion. Exercise caution when using these solvents.
• Proper Cutting Techniques: Use appropriate tubing cutters to ensure clean, perpendicular cuts, maintaining a proper seal and flow consistency.
• Regular Inspection: Periodically check for signs of wear, such as surface cracks or discoloration, to prevent potential system failures.
Conclusion
PEEK tubing, especially the 1/16” OD variant, offers a reliable and versatile solution for various analytical applications. Its unique combination of strength, chemical resistance, and thermal stability makes it a valuable component in any laboratory setting. By selecting the appropriate inner diameter and adhering to best practices, laboratories can enhance their analytical performance and ensure consistent, accurate results.
For high-quality PEEK tubing solutions tailored to your laboratory needs, contact Chromasir today. Our experts are ready to assist you in optimizing your analytical workflows.
Post time: Mar-07-2025