Tricalcium Silicon Pentaoxide CAS 12168-85-3
Product Name:tricalcium silicon pentaoxide
Synonym:Calcium oxide silicate (Ca3O(SiO4));c3s [cement component];calcium silicate [ca3sio5];Calcium oxide silicate;Tricalciumsiliciumpentaoxid;Tricalcium Silicate Submicron
CAS NO.:12168-85-3
EINECS NO.:235-336-9
Molecular Formula:Ca3H4O5Si-8
Purity & Grade: 99%; Medicine grade
Character:White powder
Free sample:Available
Stock:In stock
Warehouse: USA/EU/AU Warehouse
MOQ & Package: 1g; Package according to demand
Shipping: Safe and fast delivery
Lead Time: 5-10 days
Store & Shelf life: Cool & dry place; 24 months
Description
Product description

Tricalcium silicon pentaoxide CAS 12168-85-3 is an important inorganic silicate mineral compound and a core component of silicate cementitious materials. This substance typically exists in a crystalline structure, exhibiting relatively stable chemical properties. In its solid state, it possesses moderate hardness, high temperature resistance, and corrosion resistance, and is not easily damaged by external factors in the natural environment. Upon contact with moisture, it undergoes a slow and regular hydration reaction, gradually forming stable hydrated crystalline products that rapidly solidify and harden, continuously enhancing the overall structural strength and possessing excellent bonding ability and molding stability.
Due to its reliable mechanical properties, good durability, and environmentally friendly physicochemical characteristics, Tricalcium silicate is widely used in the production of various building substrates, engineering masonry materials, composite inorganic building materials, and rigid structural auxiliary materials. It is a key basic raw material in the civil engineering and building materials industries, and is also frequently used as a functional inorganic additive to optimize the density and structural stability of various inorganic composite materials, making its applications extremely broad.

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COA
| Tests | Specifications | Results |
| Tricalcium silicate(C₃S) | ≥95.0% | 96.5% |
| Dicalcium silicate(C₂S) | ≤3.0% | 2.1% |
| Free CaO | ≤1.0% | 0.4% |
| SiO₂ | 25.0-27.0% | 26.1% |
| CaO | 70.0-72.0% | 71.2% |
| Al₂O₃ | ≤1.0% | 0.3% |
| Fe₂O₃ | ≤0.5% | 0.2% |
| Mgo | ≤1.5% | 0.8% |
| Loss on Ignition (LOI) | ≤1.0% | 0.5% |
| Conclusion | Conform with enterprise specification | |
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Crystal Structure and Polymorphism
Stable temperature under normal pressure: 1250–2065℃; decomposes into C₂S+CaO below 1250℃; inconsistent melting above 2065℃.
Polymorphism: 7 types, triclinic (T1–T3), monoclinic (M1–M3), and rhombohedral (R); industrial clinker is mainly M1 and M3.
Structural characteristics: Composed of Ca²⁺ and [SiO₄] tetrahedra, prone to defects at high temperatures, and has high hydration activity.
The role of Tricalcium silicon pentaoxide CAS 12168-85-3 in cement:
Content: 50%–70% in clinker, approximately 50%–60% in ordinary Portland cement.
Strength contribution: Dominates early strength (over 70%), still dominant at 28 days.
Setting time: Higher content results in faster setting and higher early strength, but slightly increases the risk of drying shrinkage and cracking.
Durability: Good frost resistance, low drying shrinkage; relatively poor sulfate and water resistance.
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Package

Shipping Methods
|
Transportation Time |
Shipping method |
Cargo weight requirements |
Advantage |
|
3-7 days |
DHL,Germany DHL,Germany DPD, |
Suitable for under 50kg. |
We have warehouses in Germany and California, USA, and customers in Europe and America can enjoy sending goods directly from these two places. |
|
7-15 days |
By Air |
Suitable for more than 50kg. |
|
|
15-60 days |
By Sea |
Suitable for more than 500kg. |
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FAQ
01. What are the key differences between Tricalcium silicon pentaoxide CAS 12168-85-3 and dicalcium silicate?
Tricalcium silicon pentaoxide has high early strength, rapid hydration, and high heat release; dicalcium silicate has slow hydration, low early strength, continuous strength increase in later stages, and high durability with low heat.
02. What scenarios are suitable for cement with Tricalcium silicon pentaoxide CAS 12168-85-3 content?
Suitable for low-temperature construction, winter projects, and building scenarios requiring rapid hardening and early strength.
03. Where can I buy Tricalcium silicon pentaoxide CAS 12168-85-3?
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