Sodium Silicate

Sodium silicate is an inorganic salt formed from sodium cations and silica. It exists as a clear, viscous solution (sometimes called waterglass) and is used in cosmetic formulations as a stabilising and pH-regulating agent. The ingredient appears in fewer than 1% of skincare products, typically at low concentrations.In skincare, sodium silicate functions primarily as a buffering agent, helping to maintain the pH stability of a formulation. It also serves as an anticorrosive ingredient, protecting the integrity of the product and its packaging over time.

Sodium silicate acts as a buffering agent, meaning it resists changes in pH when acids or bases are introduced to a formula. This is particularly important in skincare, where pH directly affects the skin's barrier and the performance of active ingredients. By stabilising pH, the ingredient helps ensure that products remain effective and gentle throughout their use.The ingredient also provides anticorrosive properties, creating a protective barrier that prevents the active ingredients or packaging materials from breaking down prematurely.

Sodium silicate is a behind-the-scenes ingredient that requires no special usage guidance. It is incorporated by formulators at the manufacturing stage to ensure the product remains stable and pH-balanced throughout its shelf life. Simply use your skincare product as directed by the brand.

Sodium silicate is generally regarded as safe in cosmetic formulations at typical concentrations. No specific skin irritation or sensitisation concerns have been identified at the levels used in skincare products.