Sodium Magnesium Fluorosilicate

Sodium Magnesium Fluorosilicate is an inorganic double salt of sodium and magnesium with fluorosilicate anions. In cosmetics it functions mainly as an inert filler that adds bulk and a dry, soft-slip feel for mattified application, though published performance data are limited.
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Ingredient Snapshot

Overview
A mineral filler that adds bulk and a soft, mattifying finish.
Category
Tone/Texture
Type
Mineral

Ingredient Ratings

Overall Rating

Fair

Comedogenic Risk

None

Skin Benefits

It helps curb surface shine for a smoother, soft-focus look and can improve product glide during application, though evidence for its performance is modest, so results may vary.

Uses In Skincare & Cosmetics

It's often included in pressed powders, loose setting powders, and oil-control primers to refine finish, and used in matte foundations to improve payoff and wear.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

It's generally considered safe at typical cosmetic concentrations, but may cause minor eye or skin irritation in sensitive individuals. Avoid inhaling dust from loose powders; pressed or well-bound formats reduce exposure.

Is Sodium Magnesium Fluorosilicate a Good Ingredient?

It rates Fair because evidence for its mattifying and slip effects is limited and not strongly supported by clinical data, suggesting its role is mainly inert bulking rather than a proven treatment benefit. Some users may experience mild irritation, and loose powders can pose inhalation concerns.

Products with Sodium Magnesium Fluorosilicate

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