Raw or simply prepared natural cork represents the earliest stage of commercial processing — bark stripped from cork oak trees with minimal further treatment — and is the primary input for the entire downstream cork supply chain, from wine stoppers to thermal insulation panels. The material's cellular structure, which gives it compressibility and impermeability, is highly sensitive to handling and moisture during transit, making packaging and container humidity control critical logistics considerations. Because cork oak bark is harvested on roughly nine-year cycles, supply availability is inherently seasonal and tied to harvest-year conditions in producing regions.

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