Hydrated Silica

What is Hydrated Silica?

Hydrated silica consists of amorphous silicon dioxide particles with incorporated water, formed by reacting sodium silicate with acids to create a fine, lightweight precipitate. This mineral-derived ingredient appears as a white, fluffy powder with high porosity and surface area. In cosmetics, it features prominently in exfoliating scrubs, facial cleansers, toothpastes, powders, and emulsions. It works through physical mechanisms: larger particles provide mild abrasion to polish the skin surface, while its absorbent structure soaks up oils and moisture for a drier feel; it also stabilizes formulas by thickening, opacifying, and preventing clumping, enhancing overall product performance, spread, and visual appeal without altering the skin's natural barrier.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Abrasive
Provides gentle mechanical exfoliation and polishing, helping remove surface dead skin cells and improve smoothness and slip in scrubs and cleansers.
Absorbent
Absorbs water and/or sebum to reduce greasiness and shine, improve dry touch, and help keep powders and emulsions feeling lighter on skin.
Anticaking agent
Prevents powders from clumping by reducing moisture pickup and improving flow, keeping loose and pressed powders uniform during storage and use.
Bulking agent
Increases mass/volume to build structure and improve handling, commonly used to adjust feel, spread, and cost-in-use without acting as a primary active.
Opacifying agent
Makes a formula less transparent to create a creamy, opaque look; can also help visually mask suspended particles and improve aesthetic uniformity.
Oral care agent
Supports oral hygiene performance (cleaning, freshening, plaque control, sensitivity support) in toothpaste, mouthwash, and related products.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Delivers mild mechanical exfoliation to refine skin texture and boost smoothness.

Controls shine by absorbing excess sebum, promoting a matte finish.

Enhances formula stability, flow, and application in powders and cleansers.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Those with oily skin desiring reduced greasiness and shine.
People with very sensitive skin prone to irritation from particulates.
Users seeking gentle physical exfoliants in daily routines.
Those avoiding physical exfoliants due to compromised barriers.
Individuals using matte or powder cosmetics for improved wear.
Individuals with rare silica sensitivities or respiratory concerns.

Safety Notes

  • Considered safe for cosmetic use across concentrations by regulatory panels.
  • Non-comedogenic with low hazard rating from skin safety databases.

Frequently Asked Questions about Hydrated Silica

What makes hydrated silica different from regular silica?

It contains bound water for higher absorbency and softer texture in formulations.

Is hydrated silica safe for facial scrubs?

Yes, it provides gentle abrasion suitable for most skin types when used as directed.

Does it clog pores?

No, it has a comedogenic rating of 0 and absorbs oils to prevent buildup.