Compatibility: Specific types of plastic (like PP - Polypropylene and PET - Polyethylene Terephthalate) are chemically inert and will not react with most cosmetic formulations, preserving the cream's stability and efficacy.
Good Barrier Properties: Plastics provide a good barrier against moisture loss, preventing the cream from drying out.
Modern plastic jars often come with user-friendly features that are difficult or expensive to achieve with other materials:
Wide Mouths: Easy to scoop out product.
Secure Lids: Prevent leaks and spills.
Stackable: For easy storage.