Plasticized polymeric compositions based on vinyl chloride polymers and particularly useful as sheathings for electric cables and for similar applications are disclosed. The compositions contain very small amounts, from 0.05 to 3.0 parts, preferably from 0.05 to 1.0 part by weight of SiO2, very small amounts, from 0.0005 to 1.0 preferably from 0.001 to 0.5 part by weight of a phenol-type antioxidant, and optionally but not necessarily small amounts, from 0.5 to 4.0 parts, preferably from 0.05 to 2.0 parts, by weight of oxides and/or hydroxides of magnesium, aluminum, zinc and alkaline earth metals.
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