Many formulators and users may observe that certain silicone emulsifiers solidify, thicken, separate, or become cloudy when exposed to low temperatures. This is generally a change in physical state rather than a sign of degradation or product failure. In most cases—provided there is no noticeable off-odor, abnormal color, irreversible clumping, or persistent, long-term phase separation—the product can be restored to its original state by bringing it back to room temperature and stirring it thoroughly.
In personal care formulations, silicone emulsifiers primarily serve to stabilize the integration of the silicone oil phase and the aqueous phase, while enhancing spreadability, skin feel, and overall system uniformity. While an increase in viscosity at low temperatures may temporarily affect dispersion rates, ease of incorporation, or initial sensory characteristics, it typically does not alter the molecular structure of the emulsifier. The factors that truly dictate the degree of integration are the specific type of silicone oil used, the composition of the aqueous phase, the HLB (Hydrophilic-Lipophilic Balance) match of the emulsifier, the order of addition, the intensity of shear during mixing, and storage temperatures.
Therefore, it is recommended to allow the material to warm to 20–30°C before use; if necessary, apply gentle heat while stirring slowly. When incorporating the emulsifier into a formulation, avoid adding it all at once while the other phases are cold—consider pre-mixing or adding it in stages instead. If, after warming and stirring, the product continues to show persistent phase separation, noticeable graininess, or reduced stability, you should re-evaluate the compatibility of the formulation or consider switching to an emulsification system better suited for low-temperature storage.