Korkprop

A cork stopper is a stopper made from natural cork and is used as a seal on whisky bottles. Natural cork comes from the bark of the cork oak tree (Quercus suber) and provides a tight, elastic and light seal, while allowing a controlled exchange of air. The cork stopper has been the dominant solution in the spirits industry for decades.

Materials and construction

• Material: Natural cork, often in its natural form or in agglomerated cork blended with binders.

• Structure: porous and compressible, which provides a tight seal upon insertion and the ability to rebound after pressure.

• Variations: Natural cork stopper, agglomerated cork (composed of cork particles) and synthetic stoppers as alternatives.

Function and maturation

• Tightness and air exchange: The stopper creates a tight seal and allows controlled oxygen ingress, which can affect the storage and maturation of whisky.

• Cork taint: The risk of cork contamination (TCA) can give unwanted odors and flavors.

• Flavor influence: To a lesser extent, the cork's own components can become noticeable with longer storage or insufficient sealing.

Variations

• Natural cork stopper

• Agglomerated cork (composed of cork particles)

• Synthetic stoppers as alternatives

Care and storage precautions

• The condition of the cork is crucial: dry or damaged stoppers can lose tightness and allow leaks.

• Storage at appropriate temperatures and conditions is recommended in accordance with the manufacturer's instructions.

Environment and sustainability

• Cork is a sustainable, renewable material, harvested without felling the tree.