A study by the Chalmers University of Technology in Sweden, concluded that rigid PVC does not degrade in landfill (28). PVC-U will remain inert in landfill, and there is no evidence to suggest that PVC-U would be a source of any toxic substances under landfill conditions.

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28. Hjertberg, T. "Degradation of PVC in Landfills - a theoretical evaluation", Chalmers University of Technology, Sweden 1995.