Synthetic resin generally obtained from the condensation of epichlorohydrine with biphenyl, belonging to the category of thermosetting compositions and characterized by the presence of epoxy groups in the structure. The epoxy resins find ample use as adhesives and consolidants, presenting highly cohesive properties in combination with extremely varied materials (glass, metals, ceramics, cements, etc.). In general, they also have optimum thermal and mechanical properties, as well as chemical inertia. In restoration, they are utilized only in cases in which the need of reversibility is not considered a priority, given that the addition established is insoluble and infusible. Largely used in architectural restoration, they find various limitations in the restoration of paintings, as in some operations of the structural re-consolidation of the wooden support and for local interventions on the textile support. They are usually commercialized in two phases (resins and hardeners). Commercial names are: Araldite, Epikote, Epon, etc.