INCI name Hydrated Silica
CAS number 10279-57-9, 112926-00-8, and 7631-86-9
Hydrated Silica, a form of silicon dioxide, is widely used in personal care and cosmetic products. Known for its gentle abrasive properties, it effectively exfoliates the skin by removing dead cells. Additionally, Hydrated Silica acts as a thickening and viscosity-controlling agent, enhancing the texture and feel of various formulations. Its chemical formula is H₁₀O₃Si.
Purpose
Hydrated Silica is a multifunctional ingredient in personal care products. It acts as an abrasive for gentle exfoliation, an absorbent to control excess oil, and a cleansing agent to remove dirt and buildup. Additionally, its viscosity-controlling properties enhance product texture and stability.
Origin
Hydrated Silica is a mineral-based compound produced by reacting silicon dioxide with water under high pressure and temperature. It appears as a fine, white, odorless powder. Although derived from silicon, it is not the same as silicone, as its chemical properties change during the manufacturing process.
| Feature | Description |
|---|---|
| Name | Hydrated Silica |
| Type | thickener, opacifier, and absorbent |
| Source | Derived from silica (silicon dioxide) |
| PH | 7.0 |
| Solubility | Insoluble in water and most solvents |
| Physical state | Powder |
| Color | White |
| Odor | Odorless |
| Melting Point | 1610°C |
| Concentration | Varies by application |
Mild Abrasive Action
Hydrated silica provides gentle exfoliation without causing microdamage, making it ideal for toothpaste to remove plaque and surface stains. It is also used in facial scrubs for soft, polished skin, offering an effective yet non-irritating exfoliation method.
Oil Absorption & Sebum Control
This ingredient effectively absorbs excess oils, preventing greasiness in cosmetic formulations such as face powders, foundations, and mattifying creams. It helps control shine, making products last longer while keeping the skin fresh and matte throughout the day.
Moisture Regulation
Hydrated silica acts as a moisture stabilizer by absorbing and releasing water as needed, helping maintain product consistency in varying environmental conditions. This property is especially useful in creams, powders, and gels, ensuring they remain effective and stable over time.
Enhanced Product Stability
By preventing ingredient separation, this improves the uniformity and suspension of active components in emulsions. It ensures long-lasting product performance, making formulations more reliable and preventing unwanted texture changes.
Whitening & Polishing Effect
In oral care products, hydrated silica gently polishes teeth and removes stains without damaging enamel. It is a key ingredient in whitening toothpaste and other dental care formulations, offering an effective and safe way to enhance dental aesthetics.
Transparency & Opacity Control
This ingredient modifies the visual properties of cosmetic and skincare products by either enhancing transparency for a clear gel effect or increasing opacity for a richer, creamier appearance. It allows formulators to create a wide range of textures and finishes.
Non-Toxic & Biocompatible
Being chemically inert and non-irritating, this is safe for use in food, pharmaceuticals, and personal care products. It does not cause harm to the skin or internal tissues, making it a trusted ingredient in many formulations.
Lightweight Bulking Agent
Hydrated silica increases volume in formulations without adding significant weight, making it ideal for loose powders, pressed powders, and lightweight creams. It contributes to a luxurious feel without making the product heavy or greasy.
Flow Enhancement & Anti-Caking
By preventing powder-based products from clumping or hardening, hydrated silica ensures smooth and even application. This makes it valuable in setting powders, dry shampoos, and even food applications like spice blends, where flow consistency is essential.
Thermal Stability & Heat Resistance
Hydrated silica remains stable under high temperatures, making it suitable for heat-processed formulations such as baked cosmetics, high-temperature manufacturing processes, and some pharmaceutical applications. Its resilience ensures that products maintain their intended performance even under varying temperature conditions.
Applications of Hydrated Silica in Skincare and Cosmetics
Exfoliants and Scrubs
Hydrated silica is commonly used in facial and body scrubs as a gentle exfoliating agent. Its fine particles help remove dead skin cells and impurities without causing irritation, making it suitable for sensitive skin.
Mattifying and Oil-Control Products
Due to its oil-absorbing properties, this is often included in mattifying creams, primers, and setting powders. It helps control excess sebum, reducing shine and extending the wear time of makeup.
Toothpaste and Oral Care
A key ingredient in whitening toothpaste,this provides a mild abrasive effect that removes surface stains without damaging enamel. It also enhances the texture of toothpaste, ensuring smooth application and effective cleaning.
Foundations and BB Creams
In liquid and powder foundations,this improves texture and spreadability while controlling oil production. It creates a lightweight, silky finish that keeps makeup looking fresh throughout the day.
Sunscreens and Moisturizers
Hydrated silica is added to sunscreens and moisturizers to improve their consistency and help absorb excess oils. It ensures a smooth, non-greasy application, enhancing user comfort.
Loose and Pressed Powders
Used in setting powders, compact powders, and finishing powders, this prevents clumping and caking. It improves product flow and ensures an even, natural-looking application.
Serums and Gel-Based Formulations
In serums and gel-based skincare, hydrated silica acts as a thickener and stabilizer, helping maintain the product’s viscosity and ensuring even distribution of active ingredients.
Deodorants and Antiperspirants
Hydrated silica absorbs moisture, making it a key ingredient in deodorants and antiperspirants to keep the skin dry, fresh, and prevent excessive sweating.
Hair Care Products
Hydrated silica is used in dry shampoos to absorb oil and refresh hair between washes. It enhances the effectiveness of volumizing hair products by providing lightweight lift and texture.