Nanoclay (montmorillonite nanoparticles) on your skin: a safety profile
Moderate risk(People-specific data is limited; this page draws from human adult context.) Used in food packaging as gas barrier (reduces O₂ permeation 50-80%). Migration from packaging to food is primary exposure route. Unmodified nanoclay has low oral toxicity (LD50 >5000 mg/kg). Organomodified forms (quaternary ammonium surfactants) may release cytotoxic modifiers. EFSA concluded migration is below threshold of concern for unmodified forms.
What is nanoclay (montmorillonite nanoparticles)?
The IUPAC name is dialuminum;tetrakis(dioxosilane);tris(oxygen(2-));hydrate.
Also known as: Wilkonite, Alum bentonite, Bentonite magma, Colloidal clay.
- IUPAC name
- dialuminum;tetrakis(dioxosilane);tris(oxygen(2-));hydrate
- CAS number
- 1318-93-0
- Molecular formula
- Al2H2O12Si4
- Molecular weight
- 360.31 g/mol
- SMILES
- O.[O-2].[O-2].[O-2].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.[Al+3].[Al+3]
- PubChem CID
- 71586775
Risk for people
Moderate riskUsed in food packaging as gas barrier (reduces O₂ permeation 50-80%). Migration from packaging to food is primary exposure route. Unmodified nanoclay has low oral toxicity (LD50 >5000 mg/kg). Organomodified forms (quaternary ammonium surfactants) may release cytotoxic modifiers. EFSA concluded migration is below threshold of concern for unmodified forms.
Regulatory consensus
2 regulatory and scientific bodies have classified Nanoclay (montmorillonite nanoparticles). The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| EFSA | 2020 | Positive list for food contact materials (unmodified, migration <0.05 mg/kg food) | |
| FDA | 2017 | No objection for food contact (FCN 1056, 1536) — specific nanoclay formulations |
Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.
Where you encounter nanoclay (montmorillonite nanoparticles)
- Food Packaging
- Industrial
- Cosmetics
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Nanoclay (montmorillonite nanoparticles):
-
Micro-scale talc or mica fillers
Trade-offs: Lower aspect ratio → less barrier improvement per unit loading. Higher loading required (30-40% vs 3-5% nanoclay).Relative cost: 0.3×
-
Cellulose nanofibers
Trade-offs: Moisture-sensitive. Requires surface modification for non-polar polymers. Biodegradable (pro or con depending on application).Relative cost: 5-10×
Frequently asked questions
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Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →