Cosmetic Stability Testing

The purpose of Cosmetic Stability Testing is to demonstrate that cosmetic products maintain their physical, chemical, and microbiological quality, as well as their intended functionality, throughout their declared shelf life when stored under appropriate conditions.

During stability studies, products are evaluated at predetermined time intervals for color, odor, appearance, pH, weight change, viscosity, microbiological quality, and, where applicable, antimicrobial preservative efficacy and packaging performance in accordance with internationally recognized test methods, including the European Pharmacopoeia. In addition to product performance, packaging integrity—such as breakage, cracking, and leak resistance—is also assessed, as packaging plays a critical role in maintaining product quality.

Stability studies may be performed under real-time or accelerated storage conditions. Accelerated stability testing is typically conducted in controlled climate chambers at temperatures of 40°C, 45°C, and 55°C, allowing manufacturers to evaluate long-term product performance within a shorter testing period.

Stability Testing Parameters

• Aerobic Mesophilic Bacterial Count
• Yeast and Mold Count
• Detection of Candida albicans
• Detection of Escherichia coli
• Detection of Pseudomonas aeruginosa
• Detection of Staphylococcus aureus
• Packaging Evaluation
• Weight Change Assessment
• Color, Odor, and Appearance Evaluation
• pH Determination
• Density Determination