Stability and compatibility test

The primary objective of conducting stability testing is to indicate the relative stability level of a product under the various conditions that it can be subjected to from the moment it is manufactured until the end of its validity.

The purpose of the test is to evaluate whether the product will meet the prescribed physical, chemical and microbiological quality standards, its functionality, safety and aesthetics over a period of time during handling, transport and storage under appropriate conditions.

Based on the stability test results we also assign the shelf life or the period after opening to the product.

The type of packaging also affects the stability of the product as it protects the product from the external environment.

On the other hand, potential leaching of substances of the packaging into the product have to be evaluated. That’s why compatibility between the packaging and its content has to be investigated, in order to ensure that no quality problems are inducted by the type of packaging material used.

Cosmetics stability test can be performed in real time or it can be accelerated. The time that it takes to complete the test and the conditions under which it is performed can vary, as can the parameters that are monitored during the stability and compatibiltiy test. However, accelerated stability tests normally include keeping the samples at elevated temperatures (37, 40 or 45 degrees) during a period of 3 months. Additionally, CE.way also tests the stability in a refrigerator and performs freeze thaw test, which is usually used to predict stability of the product during transport. If transparent packaging is used, we would also test the stability of the product when exposed to sun light.

CE.way offers a range of different cosmetics stability tests and we help you choose the right one based on the type of your product and its desired shelf life. During the stability test we monitor:

    • Various physical and chemical specifications of the product (such as pH, viscosity and density)
    • Organoleptic properties of the product
    • Microbiological specifications (Candida albicans, Pseudomonas aeruginosa, Staphylococcus aureus, Mold and yeast)
    • Packaging compatibility

If you want to find out more, please check our blog on the stability and compatibility test.