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GREENVEIL

  • beauty
  • cleaning

Sodium sesquicarbonate dihydrate

CAS 6106-20-3

Also registered as 2 other CAS numbers

15243-87-5 · 183437-63-0

Concern score

Not assessed — no hazard data yet.

Sodium sesquicarbonate dihydrate in plain language

What it is

On cosmetic ingredient lists it appears as “Trona”.

Also known as Trona · Carbonic acid--sodium--water (2/3/2) · Carbonic acid, sodium salt (2:3)​, dihydrate · Carbonic acid, sodium salt, hydrate (2:3:1) · Snowfine · Sodium carbonate (Na3(HCO3)(CO3)) dihydrate

Show all 8 names

Sodium carbonate (Na3H(CO3)2) dihydrate · Sodium sesquicarbonate (Na2CO3.NaHCO3.2H2O)

What it does

Used in cosmetics as an antioxidant and a skin protectant. Trona is a mineral consisting chiefly of Na3(CO3)(HCO3)·2(H2O).

  • Antioxidant
  • Skin protecting
  • Humectant
Is it a concern?
We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. Sodium sesquicarbonate dihydrate appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Cleaning
  • EUCosIngActiveTrona is a mineral consisting chiefly of Na3(CO3)(HCO3)·2(H2O)
    • Trona is a mineral consisting chiefly of Na3(CO3)(HCO3)·2(H2O)Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 4 composition records across product categories including Cleaning products and household care. EPA CPDat classifies this chemical for functional uses including Antioxidant, Humectant.
    • EPA CPDat observed this chemical in 4 composition records across product categories including Cleaning products and household care. EPA CPDat classifies this chemical for functional uses including Antioxidant, Humectant.Source →

Expert safety opinions

No expert opinion on file for Sodium sesquicarbonate dihydrate. 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 Sodium sesquicarbonate dihydrate yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

3 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EPA Chemical and Products Database

    exposure · updated 2019-12-20

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

Suitability

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

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.

Where it has been recorded

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

Source records

4

Named organisations

2

Cleaning products and household care

Typical roles

AntioxidantSkin protectingHumectant
See products using Sodium sesquicarbonate dihydrate →