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This refers to leak-proof barriers, commonly made from polypropylene, used in products to prevent leakage. It is a structural component, not an active skincare ingredient.
No specific concern data available
Safety summary
Polypropylene used in barriers is generally inert and safe for its intended purpose, with no direct skincare concerns.
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.