Clay facial masks: physicochemical stability at different storage temperatures

Clay-based products have gained attention in cosmetic and personal care sectors due to unique properties like adsorption and plasticity. Prior research has explored general physicochemical traits of clay dispersions. However, specific stability aspects of clay mask formulations remain unresolved. No prior work had resolved how temperature affects clay mask stability. This gap motivated a focused study on storage conditions. Existing knowledge includes clay particle behavior in liquid media. But uncertainty remains about long-term stability under varied temperatures. The need for clarity on storage protocols is evident. This study addresses that need with a targeted experimental approach.

This study aimed to evaluate how temperature influences the physicochemical stability of clay facial mask formulations. The specific problem involves determining optimal storage conditions for such products. Motivation stems from the lack of clarity on stability under different temperatures. The goal is to identify temperature thresholds that maintain product quality. Formulations were tested under controlled thermal conditions. The focus was on viscosity and visual homogeneity changes. The study also sought to assess color, odor, and pH stability. These parameters help define product shelf life and usability.

The study employed centrifuge testing and thermal treatment protocols. Formulations were stored at temperatures ranging from -5.0°C to 45.0°C. The duration of thermal treatment was 15 days. Apparent viscosity was measured to assess formulation consistency. Visual aspect and homogeneity were evaluated to detect phase separation. Color, odor, and pH were monitored as secondary stability indicators. The experimental design included multiple temperature conditions. Results were compared across all tested temperature ranges.

Temperature variation significantly impacted apparent viscosity and visual homogeneity. Centrifuge testing revealed changes in formulation consistency. Homogeneity was most affected at extreme temperatures. Color, odor, and pH remained stable across all conditions. No significant changes were observed in secondary parameters. The highest temperature (45°C) caused the greatest viscosity shift. Lowest temperature (-5°C) also induced noticeable changes. These findings suggest temperature sensitivity in clay mask formulations.

The authors concluded that temperature affects clay mask stability through viscosity and homogeneity changes. Color, odor, and pH remained unaffected by thermal treatment. These findings suggest that storage conditions must consider temperature sensitivity. The study provides data to guide formulation storage protocols. No prior work had resolved this specific stability aspect. The results support the need for controlled storage environments. No essential role was assigned to any single parameter. The authors propose that optimal storage minimizes temperature fluctuations.