Thermoplastic moulding compositions of A. 65 to 95% by weight polyvinyl chloride or vinyl chloride copolymer having K-values of 50 to 80, B. 2 to 25% by weight of a chlorinated polyolefin or of a chlorinated olefin copolymer with a chlorine content of 20 to 80% by weight, C. 3 to 30% by weight of a graft polymer produced by grafting styrene or styrene and acrylonitrile and optionally copolymerizable monomers onto an EPDM rubber as graft base.
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