Heavy metal-free stabilizer composition for halogenated polymers

A halogen-containing polymer comprising an isocyanurate-based stabilizer composition which is free from heavy metals, said isocyanurate-based stabilizer composition comprising, as main components, at least one isocyanurate, at least one dihydropyridine and at least one perchlorate salt, wherein the amount present of the isocyanurate is 0.5 to 1.2 phr (parts per hundred of resin), the amount present of the dihydropyridine is 0.1 to 0.5 phr and the amount present of the perchlorate salt is 0.05 to 0.20 phr, and wherein the amount present of any other stabilizing component that may be present is in each case smaller than that of each of the main components.