Sunscreen and active formulas are vulnerable to oxidation, causing color shifts, separation, or loss of SPF effectiveness. Packaging is essential for safeguarding cosmetic and pharmaceutical formulations against environmental stressors such as oxygen, moisture, and UV exposure. Five-layer flexible tube structures provide advanced barrier protection, making them ideal for sensitive products like sunscreen, oral care pastes, and high-performance skincare. EVOH (Ethylene Vinyl Alcohol) adds a central barrier layer that protects your formula throughout its shelf life.