Buy high quality low price MAGNESIA CALCIUM BRICKS at 70 INR / Kg at Wedge India. Magnesia Calcium Bricks (MgO-CaO Bricks) are basic refractory materials made from magnesia (MgO) and calcium oxide (CaO). These bricks are designed to withstand high temperatures, resist basic slags, and are particularly valuable in steelmaking and non-ferrous metal processing industries.
 
What Are Magnesia Calcium Bricks?
They are burned or unburned bricks made by mixing:
High-purity sintered magnesia
Calcined dolomite or lime (CaO)
Small amounts of binding agents (like phenolic resins or hydraulic binders)
The bricks are typically fired at 1600–1750°C or pressed unburned and treated chemically.
 
Typical Composition:
Component
Content (%)
MgO
70–90%
CaO
5–30%
Fe₂O₃, SiO₂
≤1–2% (impurities)
 
Key Properties:
Property
Value/Benefit
Refractoriness
> 1800°C (3272°F)
Slag Resistance
Excellent against basic slags (lime-rich)
Thermal Shock Resistance
Good (especially for unburned varieties)
Bulk Density
~2.9–3.2 g/cm³
Cold Crushing Strength
~50–100 MPa (varies by type)
 
Applications:
Lining of Basic Oxygen Furnaces (BOF)
Ladles, converters, and electric arc furnaces (EAF)
Non-ferrous metallurgy (copper, nickel, lead smelting)
Lime and cement kilns
 
Types of Magnesia Calcium Bricks:
Type
Features
Use Case
Burned
High strength and volume stability
Permanent lining of furnaces
Unburned
Better thermal shock resistance
Intermediate/replacement linings
Impregnated
Improved corrosion resistance (resins)
High-wear zones in converters, EAFs
 
Advantages:
Outstanding corrosion resistance to basic slags
Long service life in aggressive thermal environments
Excellent mechanical strength and thermal stability
Lower cost compared to pure magnesia chrome bricks
 
INDEX
Wedge MC-75
Wedge MC-70
Wedge MC-65
Wedge MC-60
Wedge MC-55
MgO%
75
70
65
60
55
CaO%
15
20
25
30
40
Σ(A+F+S)%
2.8
2.8
3
3
3
Apparent Porosity
10
10
10
10
8
Cold Crushing Strength(MPa)
55
55
55
55
55
0.2MPa T0.6 R.U.L℃
1700
1700
1700
1700
1700