Barrier
How well packaging resists the passage of oxygen, moisture, light or aroma.
Barrier is not one property. A structure can be excellent against moisture and poor against oxygen. Which barrier matters depends on what is inside and how long it needs to hold: an oxygen-sensitive food puree and a hygroscopic powder need different answers.
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What packaging is used for viscous products?
Pastes, purees and heavy liquids are decided by how you get them out, not how you get them in.
LearnHow do powders move inside a manufacturing plant?
The packaging usually follows the handling method, the dust behaviour and the batch size.
TermLiner
A bag or insert placed inside a container so the container never touches the product.
TermPrimary packaging
The layer in contact with the product.
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Educational content. Not engineering or regulatory advice — confirm ratings and specifications with your supplier and the applicable regulations.