The present invention relates to an aqueous sizing composition for mineral or organic fibers which comprises: - from 40% to 95% by weight of furanic resin, and - from 5% to 60% by weight of at least one sugar reducing agent and / or at least one non-reducing sugar, relative to the total dry weight of the composition, said sizing composition having a dry matter content of between 0.5% and 50% by weight. a process for manufacturing insulation products based on mineral or organic fibers linked by a binder using the aforementioned sizing composition, as well as the insulating products obtained by such a process.
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