How do cosmetics bottles protect the product from air exposure?

Cosmetics bottles are designed with various features to protect the product from air exposure, which can lead to oxidation and spoilage.

Here are some common methods used:

1. Air-tight Seals: Many cosmetic containers have airtight seals that prevent air from entering the bottle. This helps to keep the contents stable and prolongs shelf life.
2. Pumps and Dispensers: Airless pump bottles are designed to minimize air exposure. They use a vacuum mechanism to dispense the product without allowing air to enter the container.
3. Opaque Materials: Some cosmetics are packaged in opaque or dark-colored bottles to block light and reduce the risk of oxidation caused by UV exposure.
4. Foil or Seal Liners: Many bottles come with foil seals or liners that provide an additional barrier to air before the product is first used.
5. Minimalistic Design: Some designs minimize the opening size to reduce the amount of air that can enter when the product is dispensed.
6. Preservatives: While not a physical barrier, many cosmetics contain preservatives that help protect the product from degradation caused by air exposure.

These features collectively help maintain the integrity and effectiveness of cosmetic products.