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Silicates, borates and other salts

Tricalcium silicate

Also known as Natural alite, C3S (Cement component), Calcium silicate (Ca3SiO5)

CAS 12168-85-3Formula Ca3O5SiMolar mass 228.32 g/molEC 235-336-9
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant 39 suppliers listed
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Tricalcium silicate chemical structure, Ca3O5Si, CAS 12168-85-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
12168-85-3
Formula
Ca3O5Si
Appearance
Colorless monoclinic crystals, refractory solid
Melting point
2,150 °C
HS code
283990
Category
Silicates, borates and other salts
Illustrative photo, colourless crystals in an open woven sack in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Tricalcium silicate?

Plain description, key identifiers and synonyms

Tricalcium silicate is a chemical substance with the molecular formula Ca3O5Si and a molar mass of 228.32 g/mol. Its CAS registry number is 12168-85-3. The IUPAC name is dicalcium, oxocalcium, silicate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dicalcium, oxocalcium, silicate
CAS number
12168-85-3 CAS number cross-checked
EC number
235-336-9
Molecular formula
Ca3O5Si
UNII
404G39282C
InChIKey
BCAARMUWIRURQS-UHFFFAOYSA-N
InChI
InChI=1S/3Ca.O4Si.O/c;;;1-5(2,3)4;/q;2*+2;-4;
SMILES (canonical and isomeric)
[O-][Si]([O-])([O-])[O-].O=[Ca].[Ca+2].[Ca+2]

Synonyms

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

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless monoclinic crystals, refractory solidexp.
Melting point
2,150 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
228.32 g/molcalc.
Exact mass
227.8393 Dacalc.
LogP (octanol/water)
-6.4calc.
Topological polar surface area
109.3 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
0calc.
Heavy atoms
9calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
4calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H318Causes serious eye damage.
Precautionary statements (9)
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Tricalcium silicate suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 39 suppliers
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Where suppliers are based

39 suppliers in 2 countries

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Tricalcium silicate price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Tricalcium silicate decisively determines the essential properties of cement.

Absorbent for liquids, gases, vapors, in chromatography, road construction, constituent of lime glass, portland cement, reinforcing filler in elastomers and plastics, suspension agent, anti-caking agent, pigment and pigment extender, binder for refractory material (Calcium silicate).

Principal active hydraulic compound in Portland cement, anticaking agent in foods, component of asbestos-cement wallboard.

Industrial uses: Other, Binder, Sealant (barrier), Flux agent, Intermediate, Adhesion/cohesion promoter.

Consumer uses: Intermediate, Adhesion/cohesion promoter, Hardener, Binder, Other.

Functional uses

  • Binder

How it is made

It is formed by the solid-state reaction between calcium oxide and silica and can be produced from pure CaCO3 and SiO2.

Reaction of calcium oxide (lime) with silica to form dicalcium silicate which reacts with residual lime

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Tricalcium silicate is traded under.

HS 2839.90Indicative HS code

Silicates, commercial alkali metal silicates, other

World exports in 2024
$241M
−2.7% vs 2023, imports $307M
2019 to 2024
Top exporters
  1. China20.4%
  2. United States17.9%
  3. Netherlands11.7%
Top importers
  1. Saudi Arabia13.5%
  2. Germany8.3%
  3. United States7.3%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Tricalcium silicate is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Tricalcium silicate, based on the data on this page

What is Tricalcium silicate?

Tricalcium silicate is a chemical substance with the molecular formula Ca3O5Si and a molar mass of 228.32 g/mol. Its CAS registry number is 12168-85-3. The IUPAC name is dicalcium, oxocalcium, silicate.

What is the CAS number of Tricalcium silicate?

The CAS registry number of Tricalcium silicate is 12168-85-3.

What is the molecular formula and weight of Tricalcium silicate?

The molecular formula of Tricalcium silicate is Ca3O5Si and its molar mass is 228.32 g/mol.

What is Tricalcium silicate used for?

Tricalcium silicate decisively determines the essential properties of cement. Absorbent for liquids, gases, vapors, in chromatography, road construction, constituent of lime glass, portland cement, reinforcing filler in elastomers and plastics, suspension agent, anti-caking agent, pigment and pigment extender, binder…

Is Tricalcium silicate hazardous?

Tricalcium silicate carries the GHS signal word "Danger". Main hazards: causes skin irritation, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Tricalcium silicate?

Tricalcium silicate is usually classified under HS code 283990 (Silicates, commercial alkali metal silicates, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Tricalcium silicate?

CompoundList lists 39 suppliers of Tricalcium silicate in United States and China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Tricalcium silicate?

Suppliers quote Tricalcium silicate on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Tricalcium silicate

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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