The present application relates to a curable composition and use thereof. The curable composition of the present application is applied to products that generate heat during a driving or maintaining process, and thus can be provided as a curable composition that can be used as a material capable of treating the heat. The curable composition of the present application is applied to a product in which a plurality of elements that generate heat are integrated, and thus, heat generated from the elements can be efficiently treated while uniformly maintaining the temperature of the product. In addition, the curable composition of the present application is applied to the product as described above, whereby, even when abnormal heat generation, explosion or ignition occurs in any one of the plurality of elements, the influence of such heat generation, explosion or ignition on other adjacent elements can be prevented or minimized. The curable composition of the present application can also stably perform the above-described functions over a long period of time.