The invention relates to mixtures, comprising (a) an oligomeric compound, comprising repeat units of the general formula (I) or acid-addition salts thereof and/or (b) a compound of the general formula (II) or acid-addition salts thereof and (c) at least one compound of the general formula (III) and (d) optionally further additives, and also to the use of these mixtures for the stabilization of non-living organic materials with respect to exposure to light, oxygen, and/or heat. The invention further relates to non-living organic materials, comprising at least one of these mixtures, and to articles produced therefrom. The invention further relates to a process for the stabilization of non-living organic materials, with respect to exposure to light, oxygen, and/or heat.