It is important to select the right type of FEP shrink tubing to match your own requirements and applications. This kind of tubing is available with different shrink ratios, which influence the recovered size once it has been shrunk. You will find it is available with a 1.6 to 1 heat shrink ratio and a 1.3 to 1 heat shrink ratio in a variety of sizes. For example, a piece of tubing in AWG size 10 with a 1.3 to 1 ratio has a minimum expanded inner diameter of 0.141 inches and a recovered inner diameter of 0.112 inches, with a recovered wall of 0.010 +/- 0.002 inches. Tubing typically comes standard in 4 foot sections, but may be ordered in custom lengths.
In order to correctly cause FEP tubing to shrink, you need to apply the right amount of temperature using an approved heat gun. The minimum shrink temperature is approximately 400 to 420 degrees Fahrenheit. Most heat guns on the market today are able to achieve this level, as well as higher temperatures, in case you also work with PTFE shrink tubing. Just remember to apply the heat evenly for the best results, by slowing moving the gun back and forth over the section where the tubing is being applied.
You are able to remove shrink tubing in the event you make a mistake or the tubing does not fully shrink as desired. You can use a sharp box cutter or razor blade and carefully make an incision through the tubing. However, do not apply too much pressure, or you might end up cutting through the wire or cable underneath the tubing.