Holds Its Own: AS plastic has good resistance to water, alcohols, dilute acids, dilute alkalis, and oils. This is crucial for housing a wide range of cosmetic formulations without the risk of the container degrading, cracking, or becoming cloudy.
Barrier Properties: It provides a reasonable barrier against moisture and gases, helping to preserve the integrity and shelf life of the product inside (though for highly sensitive formulations, an additional inner liner might be used).