Production of polyurethane slab-stock foam - comprises mixing first and second chemical components, foaming the resultant mixture using carbon di:oxide and water and adding a metered quantity

A process for the continuous production of polyurethane slab-stock foam comprises a first isocyanate-based chemical component and a second chemical component. The second chemical component contains active terminal hydrogen atoms which react with the first chemical component. The components are mixed in metered quantities. The resulting mixture is frothed and foamed using carbon dioxide and water in the mixture, in order to provide a total expansion index related to a required density and hardness of the foam. The first component is an MDI-based chemical component and in that the quantity of carbon dioxide is 1-10% in relation to the second chemical component. A metered quantity of formulation water is added up to reach a total expansion index corresponding to a required density of the foam. Also claimed is a modular plant for the continuous slab-stock production of polyurethane material.