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Nov 11, 2025 - Cosmetics
Theimportanceofpreservationchallengeforthemicrobiologicalshelf-lifeandstabilityofcosmetics
The microbiological stability is a crucial factor for the shelf life and safety of cosmetic products. It describes a product's ability to protect itself from microbial contaminants like bacteria, fungi, and yeasts. Insufficient microbiological stability can promote the growth of harmful microorganisms and lead to skin irritation or infections. To minimize this risk, preservatives are used in the cosmetics industry. The microbiological stability is tested by the preservative efficacy test (PET). The method according to ISO 11930 is predominantly used.
The PET helps to verify the effectiveness of preservation systems and ensure that a product remains microbiologically safe even after prolonged use. Microbiological stability is of great importance, especially for natural cosmetics.
In the context of creating safety reports according to Regulation (EC) No. 1223/2009, the results of a PET are regulatory required for all cosmetics. Exceptions apply for so-called microbiologically low-risk products, such as anhydrous products.
We conduct approximately 10,000 PET tests in our laboratory each year and look forward to your inquiry.
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