Magnesium silicate

E number E553aINS 553(i)CAS 1343-88-0

Used as an anticaking agent.

Magnesium silicate is an anticaking agent used in powdered foods, table salt and confectionery.

Where it is and isn’t permitted

Status of Magnesium 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 182.2437retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFAPermitted, with conditions

8 food categories

highest permitted level 15,000 mg/kg

Show every food category
  • 01.5.1 Milk powder and cream powder (plain) — GMP
  • 01.6.1 Unripened cheese — GMP
  • 01.6.2.1 Ripened cheese, includes rind — GMP
  • 01.8.2 Dried whey and whey products, excluding whey cheeses — 10,000 mg/kg
  • 11.1.2 Powdered sugar, powdered dextrose — 15,000 mg/kg
  • 12.1.1 Salt — GMP
  • 12.1.2 Salt substitutes — GMP
  • 12.2.1 Herbs and spices — GMP
CXS 192-1995 Table Three, INS 553(i)and 8 further provisionsretrieved 2026-09-07

What it is made from

Precipitated by reacting a magnesium salt with sodium silicate.

  • Vegan
  • Vegetarian
CAS registry number
1343-88-0
InChIKey
ZADYMNAVLSWLEQ-UHFFFAOYSA-N
PubChem
CID 72941442

Every name it appears under

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

E number

  • E553a

INS number

  • 553(i)

CAS registry number

  • 1343-88-0
  • 14987-04-3

As it appears in regulation

  • Magnesium silicate

Other names

  • Ambosol
  • Avibest
  • Britesorb
  • Britesorb 90
  • Britesorb No. 40
  • Caswell No. 533
  • Celkate T 21
  • Chooz
  • E 553a(i)
  • E 553a(ii)
  • EPA Pesticide Chemical Code 072601
  • Florisil
  • Gastomag
  • Haiburaito 1250
  • Haiburaito 325
  • HS-T (silicate)
  • HSDB 5823
  • INS NO.553(I)
  • INS-553(I)
  • Kyowaad 600S
  • Macrosorb M 15
  • Magmasil
  • Magnesium hydrosilicate
  • Magnesium silicate
  • Magnesium silicate (talc)
  • Magnesium silicate, synthetic
  • Magnesium trisilicate
  • Magnesol
  • Magnesol XL
  • Magsorbent
  • Mizuka Life P 1G
  • Mizupearl M 302
  • Naisuton
  • Nikkagel M
  • Novasorb
  • Salisil
  • Sep-Pak Florisil
  • Shimugon M
  • Silicic acid, magnesium salt
  • Silton SS 1
  • Tri-Sil
  • Trinesium
  • Trisomin

Systematic names

  • dimagnesium tetraoxidosilane
  • Dimagnesium trisilicon octaoxide

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
  • gsfa 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/magnesium-silicate.json