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Silica silylate
Water-repelling fumed silica used in texturising powders, sprays and pastes for grip, a dry feel and oil absorption.
What it is
Silica silylate is fumed silica that has been surface-treated with silyl groups so it repels water. The safety panel lists its functions as anticaking, bulking, binding, suspension and viscosity-increasing agent, and as an occlusive emollient (Becker 2013). In hair it appears in texture "dust" powders and sprays. See styling products explained.
How it works
Fine hydrophobic particles add friction and bulk between hairs and take up oil, which gives lift and a matte look. No hair measurements were found.
What the studies show
- A safety review of silylates found them safe as used when formulated and delivered so they are not irritating or sensitising to the respiratory tract (Becker 2013).
- A 2025 amended review of synthetic amorphous silica found it safe as used when formulated to be non-irritating (Burnett 2025).
- Hair benefit has no study behind it.
How it's used in studies
Not applicable.
Side effects and safety
The main concern is inhaling fine powder or spray. Keep puffers away from your face and avoid enclosed spaces. It can leave a gritty, dull residue.
Bottom line
Harmless for most people in finished products, and useful in texture powders for fine, flat hair. We are moderately confident about safety. Performance claims are manufacturer-level.
Studies 2
Becker LC et al. Safety assessment of silylates and surface-modified siloxysilicates. Int J Toxicol. 2013
Result: Safe as used when formulated and delivered so as not to irritate or sensitise the respiratory tract.
Read the study ↗Burnett CL et al. Amended Safety Assessment of Synthetically Manufactured Amorphous Silica and Hydrated Silica as Used in Cosmetics. Int J Toxicol. 2025
Result: Safe as used when formulated to be non-irritating.
Read the study ↗Related
- KaolinA soft white clay used in matte clays, pastes and dry shampoos to soak up oil and give a dry, textured finish.
- BentoniteA swelling clay used in clay masks and some matte styling products as an absorbent and thickener; "bentonite washes" are untested for hair.
- Styling products explainedStyling products come down to how much hold and how much shine you want; there are almost no head-to-head trials, so this page combines formulation knowledge with the few things that have been measured.