When it comes to extreme industrial insulation, not all calcium silicate boards are created equal. The 1200kg/m³ high density calcium silicate board stands at the top of the performance spectrum — offering the highest mechanical strength, best dimensional stability, and reliable thermal resistance at temperatures up to 1100°C.
In this comprehensive guide, we explore what makes the 1200kg/m³ grade unique, where it's used, and why engineers worldwide specify it for their most demanding projects.
What Is High Density Calcium Silicate Board 1200kg/m³?
Unlike standard calcium silicate boards (220–500 kg/m³) designed primarily for thermal insulation, the 1200kg/m³ grade is engineered for applications where mechanical strength is just as important as thermal performance. With a compressive strength of ≥23 MPa and flexural strength of ≥15 MPa, it is the strongest calcium silicate board commercially available.
The board is based on xonotlite crystal structure (6CaO·6SiO₂·H₂O), which provides inherent stability at high temperatures. Each xonotlite molecule contains only one crystal water molecule, meaning the material maintains structural integrity even when temperatures temporarily exceed the rated service limit.
Technical Specifications at a Glance
Bulk Density: 1200 kg/m³
Compressive Strength: ≥ 23 MPa
Flexural Strength: ≥ 15 MPa
Max Service Temperature: 1100°C
Thermal Conductivity (200°C): ≤ 0.14 W/m·K
Linear Shrinkage (1000°C, 24h): ≤ 2.0%
Asbestos Content: 0% (Asbestos-free)
Key Advantages Over Standard Insulation Boards
The 1200kg/m³ grade offers several critical advantages that make it irreplaceable in heavy-duty industrial environments:
1. Superior Mechanical Strength
With compressive strength exceeding 23 MPa, this board can serve as both insulation and structural support. Standard boards (220–300 kg/m³) typically offer only 0.4–0.8 MPa — making the 1200kg/m³ grade roughly 30–50 times stronger in compression.
2. Excellent Dimensional Stability
At 1200kg/m³ density, the board exhibits minimal thermal shrinkage and warping, even after prolonged exposure to temperatures near 1000°C. This is critical for applications where tight tolerances must be maintained over years of operation.
3. CNC Machinability
The high density allows precision CNC machining — enabling custom shapes, grooves, channels, and complex geometries that would be impossible with lower-density boards. This makes it ideal for custom-engineered components and machine parts.
4. 100% Asbestos-Free
Fully compliant with international health and safety regulations. Safe for workers during cutting, installation, and throughout the entire service life of the product.
Where Is 1200kg/m³ Calcium Silicate Board Used?
This grade is specified for the most demanding applications across multiple industries:
Cement Industry
Used in preheater cyclone linings, kiln hoods, and clinker cooler walls where extreme heat and mechanical stress combine. The high strength prevents cracking and deformation during thermal cycling.
Metallurgy and Foundry
Provides structural insulation in furnace linings, ladle covers, and casting equipment. The non-wetting property with certain molten metals makes it valuable in aluminum and copper processing.
Power Generation
Installed around turbine casings, boiler walls, and high-temperature ductwork where both thermal protection and structural integrity are required.
Petrochemical and Refining
Used in reactor vessel insulation, distillation column supports, and process equipment where CUI (Corrosion Under Insulation) resistance and mechanical load-bearing capacity are critical.
Custom Engineered Parts
CNC-machined into precision components, gaskets, spacers, and specialized shapes for OEM applications across various industries.
How to Choose Between 1200kg/m³ and Other High Density Grades
HR RHINO offers a complete range of high density calcium silicate boards. Here's how to choose the right grade:
N-17 Carbon Fiber (800 kg/m³) — Best for casting applications, fiber-reinforced strength
N-14 Structural (850 kg/m³) — General structural insulation, good all-rounder
Thermal Shock (980 kg/m³) — Rapid temperature cycling, thermal shock resistance
Molten Aluminum (1020 kg/m³) — Direct contact with molten aluminum
High Strength (1200 kg/m³) — Maximum mechanical strength + thermal resistance
Rule of thumb: If your application requires the board to bear significant mechanical loads while simultaneously providing thermal insulation at temperatures above 800°C, the 1200kg/m³ grade is your best choice.
Quality Assurance and Testing
Every batch of HR RHINO 1200kg/m³ boards undergoes rigorous quality control testing including chemical composition analysis, density measurement, compressive and flexural strength testing, thermal conductivity measurement, and dimensional tolerance verification.
We provide full Technical Data Sheets (TDS) and can supply independent test reports upon request. Our products comply with international standards and are exported to over 30 countries worldwide.
Ordering and Custom Manufacturing
HR RHINO supplies 1200kg/m³ high density calcium silicate boards in standard sizes as well as custom dimensions. We offer:
- Standard board sizes with thickness range from 10mm to 100mm
- Custom CNC-machined shapes and components
- OEM manufacturing to customer drawings and specifications
- Factory-direct competitive pricing with no middlemen
- Professional export packaging for safe ocean freight delivery
Our experienced technical team can help you select the right grade and specification for your project. Contact us today for a quotation, free samples, or technical consultation.
Conclusion
The 1200kg/m³ high density calcium silicate board represents the pinnacle of calcium silicate insulation technology — combining extreme mechanical strength with reliable high-temperature performance. Whether you're insulating a cement kiln, building a reactor vessel, or engineering custom precision components, this grade delivers the performance that demanding industrial applications require.
With 18 years of manufacturing experience and an annual production capacity exceeding 20,000 m³, HR RHINO is your trusted partner for high-performance calcium silicate insulation solutions worldwide.