Potassium and cuprous iodides are used as heat stabilising agents in the manufacturing of Nylon. A main use of nylon fibers is in the manufacturing of tires, where heat resistance of the polymer is essential. For example, the tires of a light vehicle while driving can easily reach a temperature near 120°C.


The iodide and the cuprous ions inserted within the nylon polymer net prevent the cracking of the chemical chains. On average, the use of potassium and cuprous iodides allows stabilization up to 170°C.