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In tanneries, only approx. one-third of the total mass of raw hides and skins is converted to finished leather, while two-thirds become either dissolved or solid waste. As part of the natural materials category, usually considered waste, leather fibers introduced into cement mortar panels play a fundamental role in construction due to both insulation properties and mechanical strength. Waste is introduced as a powder or filler or as aggregates in the concrete mix, with energy, economic and environmental benefits. ...