Micro expansion refractory plastic is a professional sealing material for boiler and kiln wall sealing and insulation. To further improve and extend the overhaul cycle of boiler seals, and to fundamentally eliminate defects caused by boiler thermal expansion and contraction during boiler wall seal maintenance, a high-temperature micro expansion refractory plastic was developed. It features strong plasticity at room temperature, high adhesion, high strength after natural drying, micro-expansion at high temperatures, high refractoriness, good sealing performance, and convenient construction. It can be widely used in CFB boilers, pulverized coal boilers, and other industrial kilns in the thermal power industry for applications such as furnace top through-wall pipes, furnace internal flame deflectors, and complex parts of the furnace wall.
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Content |
Index |
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Bulk Density g/cm³(110±5℃×24h) |
≤2.2 |
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Fire Resistance ℃ |
≥1730 |
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Plasticity Index % |
15-40 |
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Load Softening Temperature MPa Not Less Than 110±5℃ Strength After Drying |
0.6% Not Less Than |
900 |
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4% Not Less Than |
1000 |
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Pressure Resistance |
＞20 |
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Flexural Strength |
＞5 |
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1350℃X3hPost-burning Strength MPa Not Less Than |
Pressure Resistance |
＞45 |
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Flexural Strength |
＞6 |
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Linear Change Rate After Burning |
(1400℃×3h)% |
-2±3.5 |
Compared with traditional refractory materials and refractory concrete, micro expansion refractory plastics offer the following characteristics:
1.Low bulk density and neutrality: A plastic refractory material with a neutral chemical composition.
2.Excellent plasticity at room temperature: Soft and workable, suitable for complex-shaped components in power plant boiler equipment.
3.Slight high-temperature expansion: Enhances overall furnace wall sealing and reduces heat loss.
4.High mechanical strength: High compressive and flexural strength improves service durability.
5.Stable and readily available raw materials: Composite admixtures are easy to prepare, with consistent quality.
6.Safe and environmentally friendly: Non-toxic, non-corrosive, non-polluting, and non-flammable, ensuring safe production, transportation, storage, and use.
7.Outstanding workability and simplified construction: No water addition, on-site mixing, or formwork required. Long-term curing is unnecessary, and the material is resistant to breakage. These properties simplify construction, improve working conditions, increase efficiency, and shorten project timelines, providing technical, economic, and social benefits.
Micro expansion refractory plastics are particularly suitable for applications requiring high integrity and stability of furnace linings:
●Metallurgical industry: heating furnaces, soaking furnace walls, and burner perimeters
●Power industry: boiler walls, air ducts, and areas subject to wear or thermal stress
●Cement industry: kiln heads, kiln tails, flues, and maintenance zones
●Petrochemical industry: heating furnace and reactor linings
●Other industrial furnaces and kilns: components prone to shrinkage cracks or spalling
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Factory Direct Sales |
No intermediaries, providing more competitive prices. |
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Full Range of Specifications |
Available in various standard sizes, with support for custom production of irregular-shaped bricks. |
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Customized Services |
Products can be tailored to the specific dimensions and operating conditions of the customer's kiln. |
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Stable Quality |
A comprehensive quality control system ensures strict testing throughout the process, from raw materials to finished products. |
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Bulk Supply Capability |
Large-scale production capacity to meet the requirements of bulk purchasing. |
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High Cost-Performance Ratio |
Cost-effective refractory solutions without compromising performance. |
For professional selection advice and engineering solutions for micro expansion refractory plastics, please contact Shandong Haixin Refractory Materials Co., Ltd. to enhance the stability and durability of your furnace lining structures.
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