'''3:1 ratio:''' These tubes shrink to one third of their original size when heat is applied
== Types of Heat Shrink Tubes <ref>https://www.engineersedge.com/instrumentation/shrink-tubing-review.htm</ref> ==
[[File:HeatShrink.png|thumb|Image reproduced from [https://commons.wikimedia.org/wiki/File:Heat-shrink_tubing.jpg here]]]
=== Elastomeric Tubes ===
They These tubes maintain high flexibility even at low temperatures and . They also meet stringent international specifications. Their operating temperature range is -75 to 150 °C, which is sufficiently wide. A common shrink ratio is 2:1.
=== Fluorinated Ethylene Propylene (FEP) ===
It is a versatile electrical insulator and is inert to most chemicals and solvents. Additionally, it is highly very resistant to extreme levels of heat, cold, and ultraviolet radiation, thereby making it an excellent material for heat-shrink tubing applications.
=== Polyolefin Tubes ===
The These, as mentioned above, are most commonly used heat shrinktubes and have maximum use for temperatures from -55 to 135 °C, and are used by the military, aerospace and railway industries. They are flexible and fast-shrinking, and manufactured in a wide range of colors (including clear), which can be used for color-coding wires. Polyolefin tubing shrinks at 143°C. Polyolefin heat-shrink tubing typically shrinks 2:1 diametrically, but there are high-grade polyolefin heat-shrink is tubes also available with a 3:1 ratio. Polyolefin Interestingly, polyolefin tubing may withstand survive being touched with a soldering iron.
== References ==