Stability Analysis
We perform stability tests on cosmetic and biocidal products in our laboratory.
For cosmetic products, under the scope of the "Guideline on Stability and Use after Opening of Cosmetic Products" prepared by the Turkish Medicines and Medical Devices Agency;
Accelerated Stability Test
It refers to stability/durability studies carried out under forced conditions compared to normal storage conditions to accelerate the chemical and physical deterioration of cosmetic products.
Long-Term Stability Test
It refers to stability studies where the physical and microbiological properties of the cosmetic product are evaluated, covering the predicted shelf life period.
Open Container Stability Test
These are the tests that determine the period of use of the product after opening, by keeping the product at the storage temperature declared by the manufacturer for a certain period. For open package stability tests, the product is stored in climate chambers at the storage temperature value specified on the label, with the packaging opened, and physical and microbiological properties are evaluated at periods from the production date.
Freeze-Thaw Stability Test
It allows the detection of phase separations occurring in cosmetic products. It is tested at -20°C for 24 hours in three cycles.
The following changes in the following parameters are generally monitored in stability tests:
- Physical Parameters (pH, Density, Viscosity)
- Packaging Compatibility
- Sensory Changes (Odor, Color, Appearance)
- Determination of Microbial Load
- Evaluation of Antimicrobial Protective Efficacy (Challenge Test)
For biocidal products,
the stability of biocidal products can be determined by 3 different test methods: short-term stability, long-term stability, and open container stability tests.
In stability test procedures, the acceptable tolerance limit value is accepted as maximum ± 10% over the starting value. Before and after storage in stability studies, the active substance content and relevant physical and chemical properties of the biocidal product are determined. An evaluation of observation on packaging appearance and weight changes is also made.
Accelerated Stability Test
In biocidal products, the environmental temperatures and duration information of accelerated stability test procedures are specified under the "Regulation on the Working Principles and Procedures of Biocidal Product Analysis Laboratories." Visual changes, pH value, and changes depending on the determination of the active substance amount are controlled in the test results.
Long-Term Stability Tests
In long-term stability tests conducted for biocidal products, the products are tested at 25°C for the period specified on the product label. Visual changes, pH value, and changes depending on the determination of the active substance amount are taken into account in the verification of the test procedures.
Open Container Stability Test
Open container stability is tested for the specified period on the product label at 25°C for biocidal products. Visual changes, pH value, and changes depending on the determination of the active substance amount are taken into account in the test procedures after opening the container."
