What are the differences between cork stoppers and glass stoppers?

Learn the main differences between cork and glass stoppers for half wine bottles:

• Material

- Cork stoppers are made from the bark of the cork oak, a Mediterranean tree.
- Glass stoppers are molded from sand and other minerals melted at high temperatures.

• Oxygen permeability

- Cork allows for slow and controlled micro-oxygenation, essential for the aging of wines for laying down.
- Glass stoppers create an airtight seal that prevents any oxygenation of the wine.

• Adaptability

- The cork adapts perfectly to the shape of the neck, creating an airtight seal.
- Glass stoppers have a standard shape that does not fit the neck as well.

• Risk of cork taste

- About 5 to 10% of cork-sealed wines are affected by cork taint, caused by a chemical compound called TCA.
- Glass stoppers do not interact with the wine and do not present any risk of off-taste.

• Cost

- Cork stoppers are more expensive than glass stoppers.

• Branding

- Cork is traditionally associated with great wines for laying down and confers an image of prestige.
- Glass stoppers are more neutral in terms of image.

In summary, cork remains the preferred choice for wines for aging thanks to its micro-oxygenation qualities, but it carries a risk of cork taint. Glass stoppers provide an airtight seal but do not allow aging.