Sunscreens are more effective than ever, but today’s ultra-high SPF systems can be a challenge to preserve. This is particularly true when using modern, non-traditional preservation methods. Many modern preservation systems are more oil-soluble than traditional systems, making them less effective in formulas with high, polar oil phases; like sunscreens. sensiva® PA 40 is the perfect solution for these difficult-to-preserve systems. A blend of natural, nature-identical and gentle synthetic materials, sensiva® PA 40 has proven effective in formulas where other similar preservative blends have failed.