The efficacy of preservatives, which are used for microbiological stabilization of cosmetic products before opening the original packaging and for the period of use by the end user, is required to be tested. Through this test (Challenge Test), in which the preservative efficacy is examined, it is determined whether your product is protected by the preservatives, which you have used, against any microbiological contamination and deterioration that may be experienced before opening the original package of the product and during its use by the end consumer.

The Challenge Test is based on an artificial contamination formed on the samples under laboratory conditions and the digital data obtained from this contamination.

The result of this test is determined by evaluating the number of microorganisms in the contents of the artificially contaminated product logarithmically at specific time intervals (such as 2nd, 7th, 14th and 28th days).

The process is started by inoculating the microorganisms of Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli, Candida albicans and Aspergillus brasiliensis (Aspergillus niger) and the number of microorganisms according to reference methods under laboratory conditions.

Pseudomonas aeruginosa ATCC®9027

Staphylococcus aureus ATCC®6538

Escherichia coli ATCC®8739

Candida albicans ATCC®10231

Aspergillus brasiliensis (A. niger) ATCC®16404 Our laboratory performs the Challenge Test analysis in accordance with European Pharmacopoeia 5.1.3 or ISO 11930 standards upon request of the customer.

Please contact us for your further test requirements.