Copper iodide and potassium iodide are a synergistic stabilisation package used at low loadings to prevent thermal oxidation of polyamide compounds. Upon exposure to high temperatures, hydroperoxide groups are generated which can cause polymer chain breakage if converted into a free radical. The reducing nature of iodide ions and the catalytic effect of copper work to decompose these hydroperoxide groups, avoiding the generation of free radicals. This ensures long-term stability of polyamide compounds for automotive applications.