BOOU Silane Impregnating Agent (silane penetrating sealer / silane water repellent) is a high-performance, surface-applied, non-film-forming waterproofing system based on alkylalkoxysilane technology, designed for long-term durability protection of reinforced concrete structures. The active silane molecules penetrate deeply into the concrete substrate (≥3mm), react with internal hydroxyl groups to form a dense, hydrophobic silicone resin network that blocks the ingress of water, chloride ions, carbon dioxide, sulfate, and other corrosive media from within — without altering the concrete surface appearance or reducing breathability.