PTFE shrink tubing can be applied to a variety of metal materials in order to create a protective barrier. Because of the high temperatures required to shrink PTFE, it is worth your time to verify it properly works as desired, before fully utilizing it for your processes. For instance, you might be placing the shrink tubing around a piece of metal tubing that has fiber optic cabling running through the interior. While the metal could easily withstand being heated to around 650 degrees Fahrenheit, the fiber optic cable may not be able to withstand this amount of heat as it is transferred from the metal. In most cases, since fiber optic cable is made from glass, there should be no issues, as glass has a much higher melting point. However, you may still want to test a small section of the tubing, first, so you can ensure the fiber optic cable is not damaged and performs as required.
Measure and Cut Your PTFE Shrink Tubing to the Right Lengths
When working with PTFE shrink tubing, you will want to make sure you carefully measure and cut the tubing to the desired lengths. For some applications, you have to make sure the tubing has a slight overlap, in order to fully cover and seal the area where it is being applied. For instance, if you are making a repair to a wire harness, with a three inch crack in the protective coating, you would want to use a section of shrink tubing at least 3 ½ to 4 inches in length. This provides you with ¼ inch to ½ inch overlap on each side of the crack.