Medical Heat Shrink Tubing Technical Information

Medical Heat Shrink Tubing Specifications

expand all
Diameters0.006"–0.020" (standard tolerance ± 0.001", typical)

0.021"–1.250" (standard tolerance ± 5%, typical)
Wall Thickness0.0001"–0.0005" (standard tolerance ± 0.0001", typical)

0.0006"–0.004" (standard tolerance ± 20%, typical)
LengthStandard: 50" (127 cm) minimum

Custom Cutting:

  • Maximum straight length: 96"
    • Longer lengths possible for some sizes
  • Minimum: 0.020" or less
Colors

Standard:

  • Optically clear
  • Black
  • White
  • Yellow
  • Blue (transparent)
  • Blue (opaque)
  • Gray
  • Dark green
  • Green (opaque)
  • Green (transparent)
  • Orange (transparent)
  • Orange (opaque)
  • Purple (transparent)
  • Purple (opaque)
  • Copper

Custom colors also available

Temperature RangeLong-term use (cryogenic):
-196°C (-320.8°F)–135°C (275°F)

Short-term use: Up to 200°C (392°F)

Melting point: 235°C (455°F)
Shrinkage/Sizing
  • Tight fit is best: 15% gap or less
  • PET should be sized no larger than 15% above the maximum diameter of your part
  • Target ratio is 1.1:1
Electrical PropertiesPET medical heat shrink tubing has one of the highest dielectric strengths of any thermoplastic material

Dielectric strength: > 4,000 V/mil
Dielectric constant: 3.3
Dissipation factor: 0.0025
Volume resistivity: 1018 Ohm-cm
Surface resistivity: 1014 Ohm/square
Sterilization
  • Ethylene oxide
  • Gamma radiation
  • Autoclaving (repeat autoclaving not recommended)
BiocompatibilityBiocompatible (ISO 10993)
PrintingCan be printed using conventional techniques

‘Drawing Down’ Medical Heat Shrink Tubing

The ability to "draw down" PET medical heat shrink tubing allows you to reduce tube diameter by up to 70% while maintaining a high-strength, thin-wall heat shrink tube.

  • PET medical heat shrink tubing ratios are different from those of other tubing:
    • Tight fit is best: 15% gap or less
    • PET should be sized no larger than 15% above the maximum diameter of your part
    • Target ratio is 1.1:1
  • Shrinking temperature:
    • Approximately 70°C (158°F)–190°C (374°F)
    • Typical shrinking temperature recommended for most applications: 150°C (302°F)

Controlling Shrinkage

Unrestricted, PET medical heat shrink tubing will shrink both radially and axially. In most cases, the best overall performance comes with minimal shrinkage (less than 15%–20%), except when the tube drawing process is used as described below, or unless you restrict axial shrinkage.

You can restrict axial shrinkage by holding the ends of the heat shrink tube during the heating process to prevent the tube from shrinking in length. This will result in a heat shrink tube with radial shrinkage up to 50% or more, depending on temperature.

Tube Drawing for High Radial Shrinkage

Use the tube drawing process to achieve very high radial shrinkage (up to 50% or more). Simply apply axial tension, stretching the heat shrink tube while you’re heating it. You can reduce the diameter by more than 50% at temperatures below 100°C (212°F); with even greater diameter reductions at higher temperatures, up to about 190°C (374°F).

For more information about proper sizing, visit the Medical Heat Shrink Tubing Online Store and select a tubing item, or contact us.

Watch and Learn: PET Medical Heat Shrink Tubing Video Tutorials

  • Achieving Optimal Shrinkage with PET Heat Shrink Tubing
  • Using PET Heat Shrink Tubing for Catheter Tipping
  • Using PET Heat Shrink Tubing for Precision Tube Joining
  • Using PET Heat Shrink Tubing for Stiffness & Rigidity
  • How to Remove PET Heat Shrink Tubing with No Residue
NEED READY-TO-GO COMPONENTS, RIGHT NOW?ONLINE STORE
NEW TIPS FOR USING PET HEAT SHRINK TUBINGWATCH VIDEO
GOT A QUESTION, AN IDEA, A CHALLENGE?CONTACT US