Fluorinated Ethylene Propylene (FEP) heat shrink tubing is renowned for its excellent chemical resistance, optical clarity, and electrical insulation properties. It's widely used across various industries, including medical, aerospace, and electronics. However, due to its unique characteristics, shrinking FEP tubing requires specific techniques to ensure optimal results.​

Understanding FEP Heat Shrink Tubing

FEP heat shrink tubing is supplied in an expanded state and, upon the application of heat, contracts to conform tightly around the desired component. This process provides a protective, insulating, and sealing layer.​

Key Properties:

• Lower Shrink Temperature: FEP begins to shrink at approximately 110°C (230°F
• Shrink Ratios: Commonly available in 1.3:1 to 1.6:1 ratios, indicating the degree of diameter reduction upon shrinking.​
• Chemical Resistance: Inert to most chemicals, making it ideal for harsh environments.​
• Electrical Insulation: Excellent dielectric properties suitable for insulating electrical components.​
• Excellent resistance to UV: Offers strong protection against ultraviolet radiation, making it suitable for prolonged outdoor use.
• Sterilisation Properties: Can withstand common sterilisation methods, making it ideal for medical and laboratory applications.

Step-by-Step Guide to Shrinking FEP Tubing

1. Preparation

• Select the Appropriate Size: Choose a tubing size that, when shrunk, will fit snugly over the component.​ We recommend that the recovered ID of the sleeving is smaller than the diameter of the part to be covered.  This ensures a tight fit.
• Cut to Length: Measure and cut the tubing to the desired length, Adtech’s FEP heat shrink longitudinal (typically around 5-10%).​
• Clean the Component: Ensure the component is free from contaminants to promote adhesion and prevent imperfections.​

2. Heating Process

• Equipment: Use a heat gun capable of reaching temperatures above 110°C (230°F
• Application:
  • Positioning: Slide the tubing over the component, ensuring even coverage.​
  • Heating: Apply heat evenly, starting from one end and moving to the other. Rotate the component to ensure uniform shrinkage.​
  • Observation: The tubing will become clear and tightly conform to the component as it shrinks.​

3. Cooling and Inspection

• Cooling: Allow the assembly to cool naturally.​
• Inspection: Check for uniform shrinkage, absence of air bubbles, and proper adhesion.​

Safety Considerations

• Ventilation: Ensure adequate ventilation during the heating process, as FEP can emit fumes at high temperatures.​
• Protective Equipment: Wear heat-resistant gloves and safety glasses to protect against burns and fumes.​

Applications of FEP Heat Shrink Tubing

• Medical Devices: Insulating and protecting surgical instruments and catheters.​
• Aerospace: Shielding wires and components from extreme temperatures and chemicals.​
• Electronics: Providing insulation and strain relief for connectors and terminals.​

Conclusion

Shrinking FEP heat shrink tubing requires careful attention to temperature and technique. By following the outlined steps and safety precautions, you can achieve a secure and protective fit for your components. For specialised applications or further assistance, consult with experts or refer to manufacturer guidelines.

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