Silica and water, often combined to form hydrated silica, serve multiple roles in cosmetic formulations, influencing texture, stability, and overall product performance. The silica component, a form of silicon dioxide (SiO2), exists in various forms, including amorphous and crystalline structures, with hydrated silica representing an amorphous form containing water molecules within its structure [1]. Water is a well-known moisturizing agent, essential for skin hydration [2].

The production of water and silica, meaning hydrated silica, usually involves a sol-gel process or precipitation method. In the sol-gel method, silicon alkoxides undergo hydrolysis and condensation in an aqueous solution, yielding a silica gel, which is then dried and milled to the desired particle size [3]. The precipitation method involves reacting sodium silicate with a mineral acid, resulting in the precipitation of silica particles from the solution which are then washed, dried, and processed.

Hydrated silica offers several benefits in cosmetic applications related to its absorptive and texturizing properties. As an absorbent, it can control oil and moisture, reducing shine and greasiness in skincare products [4]. Regarding texture, it acts as a thickening agent, stabilizer, and suspending agent, impacting the feel and consistency of creams, lotions, and powders. It also functions as a mild abrasive in toothpastes and scrubs [5].

Water and silica find use in a wide array of cosmetic products. In skincare, they are found in moisturizers, serums, and cleansers, where silica enhances the product's texture and absorption, and water provides hydration. In color cosmetics, they improve the adherence and longevity of foundations, powders, and eyeshadows [6]. Moreover, they appear in oral care products like toothpaste where silica functions as a cleaning and polishing agent [5].

Water and silica are generally packaged in airtight containers, such as bags, drums, or bottles, depending on whether they are in powder or liquid form to prevent contamination and maintain product integrity. Transportation should comply with relevant regulations regarding the shipping of chemical substances, ensuring that products are protected from moisture, extreme temperatures, and physical damage during transit [7].

Citations:
[1] Iler, R. K. (1979). The Chemistry of Silica: Solubility, Polymerization, Colloid and Surface Properties, and Biochemistry. Wiley-Interscience.
[2] Lodén, M. (2012). Dry Skin and Moisturizers: Chemistry and Function. CRC Press.
[3] Brinker, C. J., & Scherer, G. W. (1990). Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing. Academic Press.
[4] Draelos, Z. D. (2010). Cosmetic Dermatology: Products and Procedures. John Wiley & Sons.
[5] Ten Cate, J. M. (2018). Oral Microbiology; Textbook of Oral Microbiology. John Wiley & Sons.
[6] Schlossman, M. L. (2009). The Chemistry and Manufacture of Cosmetics. Allured Publishing Corporation.
[7] European Chemicals Agency. (2007). Guidance on Information Requirements and Chemical Safety Assessment: Chapter R.7a: Endpoint Specific Guidance. ECHA.

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