Cork is a natural, impermeable, buoyant, elastic, and fire-resistant material harvested from the bark of the cork oak tree (Quercus suber).

Key characteristics of cork:

• Natural and Renewable: Cork is a sustainable resource because it is harvested without killing the tree. The bark regenerates, allowing for repeated harvests.
• Impermeable: Cork is virtually impermeable to liquids and gases, making it ideal for bottle stoppers.
• Buoyant: Its buoyancy has made it useful in various applications, including fishing floats.
• Elastic: Cork can be compressed and return to its original shape, which is why it works well as a sealant.
• Fire-Resistant: Cork is naturally fire-resistant, providing a degree of safety in construction applications.

Cork is primarily used for:

• Bottle stoppers, especially for wine bottles. Source
• Flooring and wall coverings due to its insulation and acoustic properties. Source
• Insulation material in construction. Source
• Various industrial applications, including gaskets and friction materials. Source