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Magnesium hexafluorosilicate

CAS 12449-55-7 · 70/100 · High conf.

Also registered as 3 other CAS numbers

18972-56-0 · 1344-27-0 · 16949-65-8

Magnesium hexafluorosilicate chemical structure

Concern score

70/100High concern based on regulatory listings.
High confidence

Magnesium hexafluorosilicate in plain language

What it is

On cosmetic ingredient lists it appears as “Magnesium fluorosilicate”.

Also known as Magnesium fluorosilicate · Fluosilicate de magnesium · HEXAFLUOROSILICATE(2-) magnesium (1:1) · Magnesium fluosilicate · Magnesium silicofluoride · Magnesium hexafluoridosilicate(2-)

Show all 19 names

magnesium hexafluorosilicon(2-) · Caswell No. 532 · Ec 241-022-2 · Fluorosilicato de magnesio · Magnesium silicofluoride, (solid) · Magnesium hexafluorosilicate(2) · PC-075304 · Silico fluoruro de magnesio · Silicate(2-), hexafluoro-, magnesium · Silicate(2-), hexafluoro-, magnesium (1:1) · UN2853 · UNII-H37V80D2JS · magnesium salt hexafluorosilicate

What it does

Used in cosmetics as an antiplaque and an oral-care ingredient.

  • Antiplaque
  • Oral care
Is it a concern?
High concern: no hazard classifications on record. It is restricted in EU cosmetics.

Why it's flagged

Magnesium Fluorosilicate is restricted in cosmetic products under Annex III of the EU Cosmetics Regulation (EC) 1223/2009.

RestrictedEU EC — restricted

The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.

Regulation

Restrictions first, then routine listings from published regulatory sources.

  • EU Annex III — restricted
  • EU restricted in cosmetics

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUEC

    Annex III of EU Cosmetics Regulation (EC) 1223/2009: substances which cosmetic products must not contain except subject to the restrictions laid down. Product types: Oral products Maximum concentration: 0,15 % calculated as F. When mixed with other fluorine compounds permitted under this Annex, total F concentration must not exceed 0,15 % Conditions of use and warnings: Contains magnesium fluorosilicate For any toothpaste with compounds containing fluorine in a concentration of 0.1 to 0.15% calculated as F unless it is already labelled as contra-indicated for children (e.g. "for adult use only") the following labelling is obligatory: "Children of 6 years and younger: use a pea-sized amount for supervised brushing to minimise swallowing. In case of intake of…

    restricted
    View source →
  • EUCosIngActive2 entries
  • USEPAcommercial use observedEPA CPDat observed this chemical in 1 composition records across product categories including Raw materials. EPA CPDat classifies this chemical for functional uses including oral care, Pharmaceutical.
    • EPA CPDat observed this chemical in 1 composition records across product categories including Raw materials. EPA CPDat classifies this chemical for functional uses including oral care, Pharmaceutical.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for Magnesium hexafluorosilicate. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for Magnesium hexafluorosilicate yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

7 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →
  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2013-05-14

    Open →
  • EPA Chemical and Products Database

    exposure · updated 2020-02-13

    Open →
  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →
  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →
  • openFDA Substance

    registry · updated 2026-05-24

    Open →
  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

No fragrance-linked caution surfaced in the current profile.

Good fit

This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.

Where it has been recorded

How often EPA CPDat has listed Magnesium hexafluorosilicate in a product composition. These are source records, not Greenveil catalog products.

Source records

1

Named organisations

1

Raw materials

Typical roles

AntiplaqueOral care
See products using Magnesium hexafluorosilicate →