The present invention relates to a method of manufacturing a panel or a mat, comprising: the formation of a liquid mixture with solids comprising inorganic fibers and cellulose fibers,? the formation of a sheet from the mixture on at least one foraminous element, preferably a moving foraminous element,? extracting water from the water table; and? drying the web to produce a product, characterized in that the pH of the liquid mixture comprising inorganic fibers and cellulose fibers is in the pH range from 2 to 6, and in that the cellulose fibers have an index of Schopper-Riegler ≥ 50 according to ISO standard 5267.
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