Tricalcium silicate

Tricalcium silicate is an anticaking agent, used to keep table salt and powdered products flowing.

Where it is and isn’t permitted

Status of Tricalcium silicate by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationPermitted21 CFR 182.2906retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFANot listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.

What it is made from

Produced by fusing lime with silica. It is also the principal compound of Portland cement.

  • Vegan
  • Vegetarian
InChIKey
BCAARMUWIRURQS-UHFFFAOYSA-N
PubChem
CID 25523

Every name it appears under

17 recorded names. A label may use any of them.

CAS registry number

  • 12168-85-3

As it appears in regulation

  • Tricalcium silicate

Other names

  • alite
  • Biodentine
  • C3S (Cement component)
  • Ca3SiO5
  • Calcium orthosilicate--(oxido)calcium (2/1/1)
  • Calcium oxide silicate (Ca3O(SiO4))
  • Calcium silicate (Ca3SiO5)
  • Calcium silicon oxide (Ca3SiO5)
  • dicalcium;oxocalcium;silicate
  • HSDB 880
  • Natural alite
  • Silicic acid (H6SiO5), calcium salt (1:3)
  • Silicic acid (H6SiO5), tricalcium salt
  • TRICALCIUM SILICATE
  • Tricalcium silicon pentaoxide

Hazard reference values

No reference value for this substance in the sources we hold.

Evidence and how bodies read it

Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.

Sources for this page

  • ecfr retrieved 2026-09-07

Full licence terms and publisher details on Sources. How this page is built and updated: Method.

Machine-readable:/api/v1/additives/tricalcium-silicate.json