Choosing the Right Airless Packaging for High-Viscosity Formulas
Airless packaging is built with a sealed container and a movable base or piston. As the product is used, the piston rises and pushes the product toward the top—without allowing any air to get in. This system works well for all types of formulas, but it's especially useful for thick and heavy products.
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https://bresdel.com/blogs/1129....466/Choosing-the-Rig