Refractory Mortar
Refractory mortar is a ready-to-use or site-mixed bonding material specially formulated for laying, patching and jointing various refractory bricks in high-temperature industrial furnaces and kilns. It acts as a critical sealant and binder, ensuring structural integrity, thermal stability and airtightness of refractory linings under extreme heat, corrosion and mechanical stress.
Key Product Categories
1. By Chemical Bonding Type
* Clay-Bonded Refractory Mortar: Cost-effective, for general high-temperature masonry, compatible with clay refractory bricks
* High-Alumina Refractory Mortar: High refractoriness, strong adhesion, matched with high-alumina bricks for medium & heavy-duty furnaces
* Silicate-Bonded Refractory Mortar: Excellent alkali resistance, stable at medium temperatures, easy construction
* Phosphate-Bonded Refractory Mortar: High strength after heating, ideal for severe thermal shock conditions
2. By Application Temperature
* Low-Medium Temperature Grade: ≤1200°C, suitable for boilers, incinerators, heat treatment furnaces
* High Temperature Grade: 1200–1650°C, for steelmaking furnaces, coke ovens, cement rotary kilns, glass melting furnaces
* Ultra-High Temperature Grade: ≥1650°C, for special metallurgy, non-ferrous metal smelting equipment
3. By Working State
* Plastic Refractory Mortar: Ready-mixed paste, direct application, no on-site blending needed
* Dry Powder Refractory Mortar: Mix with water/binder on site, adjustable consistency, long storage life
Superior Product Advantages:
1. Excellent Refractoriness: RON ≥1580°C, stable performance at continuous high temperatures
2. Strong Bonding Strength: Tight brick joints, no cracking or spalling under thermal cycles
3. Outstanding Thermal Shock Resistance: Withstands rapid heating/cooling, prolongs lining service life
4. Good Volume Stability: Minimal drying & firing shrinkage, no joint gaps
5. Airtight & Corrosion Resistant: Prevents hot gas leakage, resists slag, acid & alkali corrosion
6. Easy Construction: Smooth troweling, fast construction, suitable for manual & semi-mechanized masonry
7. Customizable Formulations: Tailored for different furnace types, brick materials and operating conditions
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Index
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Clay
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High Alumina
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||||
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RBTMN-42
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RBTMN-45
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RBTMN-55
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RBTMN-65
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RBTMN-75
|
||
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Refractorines(℃)
|
1700
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1700
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1720
|
1720
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1750
|
|
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CCS/MOR(MPa)≥
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110℃×24h
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1.0
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1.0
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2.0
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2.0
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2.0
|
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1400℃×3h
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3.0
|
3.0
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4.0
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4.0
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4.0
|
|
|
Bonding Time(min)
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1~2
|
1~2
|
1~2
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1~2
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1~2
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|
|
Al2O3(%) ≥
|
42
|
45
|
55
|
65
|
75
|
|
|
SiO2(%) ≥
|
—
|
—
|
—
|
—
|
—
|
|
|
MgO(%) ≥
|
—
|
—
|
—
|
—
|
—
|
|
|
Index
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Corundum
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Silica
|
Lightweight
|
||
|
RBTMN-85
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RBTMN-90
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RBTMN-90
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RBTMN-50
|
||
|
Refractorines(℃)
|
1800
|
1820
|
1670
|
|
|
|
CCS/MOR(MPa)≥
|
110℃×24h
|
2.0
|
2.0
|
1.0
|
0.5
|
|
1400℃×3h
|
3.5
|
3.0
|
3.0
|
1.0
|
|
|
Bonding Time(min)
|
1~3
|
1~3
|
1~2
|
1~2
|
|
|
Al2O3(%) ≥
|
85
|
90
|
—
|
50
|
|
|
SiO2(%) ≥
|
—
|
—
|
90
|
—
|
|
|
MgO(%) ≥
|
—
|
—
|
—
|
—
|
|
|
Index
|
Magnesia
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|||
|
RBTMN-92
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RBTMN-95
|
RBTMN-95
|
||
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Refractorines(℃)
|
1790
|
1790
|
1820
|
|
|
CCS/MOR(MPa)≥
|
110℃×24h
|
1.0
|
1.0
|
1.0
|
|
1400℃×3h
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3.0
|
3.0
|
3.0
|
|
|
Bonding Time(min)
|
1~3
|
1~3
|
1~3
|
|
|
Al2O3(%) ≥
|
—
|
—
|
—
|
|
|
SiO2(%) ≥
|
—
|
—
|
—
|
|
|
MgO(%) ≥
|
92
|
95
|
97
|
|
1. Clay-based Refractory Mortar
Core Applications: Suitable for laying clay-based refractory bricks in environments with temperatures ≤1350℃, such as low-temperature sections of industrial kilns, flues, chimneys, lower parts of hot blast stove regenerators, and boiler linings—all in low-corrosion, medium-to-low-temperature environments.
Features: Low cost, good workability, moderate resistance to rapid heating and cooling; not suitable for high-temperature molten slag/highly corrosive areas.
2. High-alumina refractory Mortar
Core applications: NM-50/NM-60: Suitable for high-alumina bricks (Al₂O₃ 55%~65%), used in the intermediate temperature section of kilns (1350~1500℃), such as ceramic kilns, metallurgical heating furnaces, and cement rotary kiln transition zones; NM-70/NM-75: Suitable for high-alumina bricks (Al₂O₃ ≥70%) or corundum bricks, used in the high-temperature section (1500~1700℃), such as blast furnace linings, steelmaking converter tapholes, glass kiln regenerators, and calcium carbide furnace linings.
Features: High refractoriness, superior slag resistance compared to clay-based slurries; the higher the Al₂O₃ content, the stronger the high-temperature resistance and erosion resistance.
3. Silica Refractory Mortar
Core Uses: Compatible with silica bricks, specifically designed for acidic conditions such as coke ovens, glass kiln walls/breast walls, and acidic steelmaking furnaces. Long-term operating temperature: 1600~1700℃.
Features: Resistant to acidic slag erosion; good thermal expansion compatibility with silica bricks, but poor alkali resistance; strictly prohibited for use in alkaline kilns.
4. Massica/Magnesium-chrome Refractory Mortar
Core Uses: Massica: Compatible with magnesia bricks; used in strongly alkaline slag conditions such as alkaline steelmaking converters, electric arc furnace hearts/walls, and non-ferrous metal smelting furnaces.
Magnesium-chrome: Compatible with magnesia-chrome bricks; used in high-temperature alkaline erosion scenarios such as cement rotary kiln firing zones, waste incinerators, and non-ferrous metal smelting furnaces.
Features: Extremely strong resistance to alkaline slag, but poor resistance to rapid heating and cooling; environmental compliance is required for magnesia-chrome refractory slurry (some regions restrict hexavalent chromium emissions).
5. Silicon carbide refractory mortar
Core applications: Suitable for silicon carbide bricks/silicon nitride-bonded silicon carbide bricks, used in high-temperature, wear-resistant, and reducing atmosphere applications such as blast furnace tapping troughs, steel ladle linings, coking furnace riser pipes, and secondary combustion chambers of waste incinerators.
Features: High thermal conductivity, high wear resistance, high-temperature oxidation resistance, and a service life far superior to traditional clay/high-alumina mortars.
6. Low-cement/cement-free refractory mortar
Core applications: Suitable for grouting/masonry of low-cement/cement-free castables or shaped refractory bricks, used for integral casting lining splicing of large industrial kilns and precision masonry of high-temperature kilns (such as glass kilns and metallurgical electric furnaces), with an operating temperature of 1400~1800℃.
Features: Low water content, high density and strength after sintering, no volume expansion problems caused by cement hydration, and excellent erosion resistance.
Frequently Asked Questions
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We are a real manufacturer, our factory is specialized in producing refractory materials for more than 30 years. We promise to provide the best price, the best pre-sale and after-sale service.
For each production process, RBT has a complete QC system for chemical composition and physical properties. And we will test the goods, and the quality certificate will be shipped with the goods. If you have special requirements, we will try our best to accommodate them.
Depending on the quantity, our delivery time is different. But we promise to ship as soon as possible with guaranteed quality.
Of course, we provide free samples.
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There is no limit, we can provide the best suggestion and solution according to your situation.
We have been making refractory materials for more than 30 years, we have strong technical support and rich experience, we can help customers design different kilns and provide one-stop service.
