Calcium Silicate
Calcium Silicate Pipe
Pre-formed calcium silicate pipe insulation sections for industrial piping systems with working temperature up to 1100℃.
Calcium Silicate
Calcium Silicate Insulation Board
High-strength calcium silicate insulation board (also known as calsil board) with excellent heat resistance and low thermal conductivity. Working temperature up to 1100C. A rigid silicate board ideal for industrial furnace and kiln lining.
- Density
- 170-500 kg/m3
- Raw Material
- Quartz sand
- Thickness
- 25-150mm (10mm for high density)
- Bending Strength
- >=0.5 MPa
Overview
- ✦ Highest strength among hard insulation materials
- ✦ No deformation at working temperature
- ✦ Lower thermal conductivity than other hard blocks
- ✦ 100% asbestos-free
Calcium Silicate Insulation Board (Calsil Board)
Calcium silicate insulation board — also known as calsil board or simply silicate board — is a rigid, high-strength industrial insulation product manufactured from silicic and calcic materials through pulping, shaping, steam curing, drying and post-processing. With a maximum working temperature of 1000/1050/1100C, calsil board is widely used in metallurgy, petroleum, chemical, mechanical, electrical, light industry and industrial kilns.
Key Features
- High temperature resistance: Rated for continuous use up to 1100C
- High compressive strength: Up to 6 MPa, suitable for load-bearing insulation
- Low thermal conductivity: Less than 0.056 W/m.K at mean temperature
- Non-asbestos: 100% asbestos-free formula meeting ASTM C533 and EN 14306
- Easy to cut and machine: Rigid board form, no special tools required
- Dimensional stability: Linear shrinkage less than 1.5% at rated temperature
Applications of Calsil Board
This versatile silicate board serves multiple high-temperature industrial applications:
- Metallurgy: Furnace and kiln backup insulation, ladle and tundish covers
- Petrochemical: Refinery equipment, pipe supports, and vessel insulation
- Power generation: Turbine casings, boiler breechings, and ductwork
- Ceramic industry: Kiln car decks and tunnel kiln insulation
- Aluminium smelting: Electrolytic cell side insulation
- Building: Heat insulation and soundproofing panels
Calsil Board vs Other Insulation Materials
| Property | Calsil Board | Ceramic Fiber Board | Rock Wool Board |
|---|---|---|---|
| Max Temp | 1100C | 1430C | 650C |
| Compressive Strength | up to 6 MPa | up to 3 MPa | up to 0.5 MPa |
| Thermal Conductivity | 0.056 W/m.K | 0.085 W/m.K | 0.040 W/m.K |
| Form | Rigid board | Rigid board | Rigid board |
| Asbestos-free | Yes | Yes | Yes |
Calsil board offers the highest compressive strength among common insulation boards, making it the preferred choice for load-bearing high-temperature applications. For even higher temperature requirements (above 1100C), ceramic fiber board is recommended.
Technical Specifications
Calcium silicate board is supplied in several grades. The table below summarizes the typical properties of the three common grades — confirm the exact values against the data sheet for your selected grade before specifying.
| Grade | Density (kg/m³) | Max Service Temp. | Thermal Conductivity | Compressive Strength |
|---|---|---|---|---|
| Standard (Type I) | 170–240 | ≤ 650 °C | ≤ 0.056 W/(m·K) | ≥ 0.9 MPa |
| High-Temperature (Type II) | 220–350 | 1000–1050 °C | ≤ 0.065–0.075 W/(m·K) | ≥ 1.0 MPa |
| High-Density Structural | 350–500 | up to 1100 °C | ≤ 0.080–0.100 W/(m·K) | up to 6 MPa |
- Density is selected by load: lightly loaded backup linings use 170–240 kg/m³, while load-bearing pipe supports and structural members use the high-density grade up to 500 kg/m³.
- Thermal conductivity rises with mean temperature; the figures above are typical at the rated mean test temperature for each grade.
- Standards: boards are manufactured and tested to ASTM C533 (Type I / Type II), EN 14306 and classified A1 non-combustible under EN 13501-1.
- For pre-formed pipe sections, see our calcium silicate pipe insulation. For outdoor or wet-service installations, pair the board with a weatherproof cladding system. The full range and temperature limits are in the calcium silicate insulation guide.
Quality and Standards
Our calcium silicate insulation boards are manufactured under ISO 9001 quality management systems. Each batch is tested for density, compressive strength, thermal conductivity, and linear shrinkage. Products are exported to Japan, South Korea, Thailand, Indonesia, Malaysia, Pakistan, Vietnam, Singapore and other markets worldwide.
Manufacturer & Supplier
Rosetexwool is a calcium silicate insulation board manufacturer and supplier serving more than 60 countries since 1982. Every calcium silicate insulation board is produced under a documented quality system certified to ISO 9001, CE and SGS, with batch-level traceability from raw material to finished product.
What our manufacturing capability covers:
- In-house melting, fibre-forming and finishing lines for consistent grade and density
- Dimensional, density and thermal checks against ASTM C533, EN 14306
- Asbestos-free, low-impurity formulations verified by incoming and outgoing inspection
- Standard and custom sizes, OEM/ODM grades, and cut-to-size supply for project quantities
For quotations, lead times or technical data sheets, contact our team with your specification and target service temperature. Explore the calcium silicate insulation hub for the full range, or read the calcium silicate insulation buying guide for selection support.
Related Calcium Silicate Products & Alternatives
composite silicate plate — A soft, flexible plate made from rare earth cotton for medium-temperature work to 600 °C, asbestos-free and easy to cut.
calcium silicate pipe insulation — Pre-formed pipe sections that keep insulation thickness uniform around the whole circumference, removing the thin spots hand-applied wraps tend to leave behind.
wired rockwool blanket — Stone wool blanket stitched to galvanised wire mesh so it can be mechanically fixed to large tanks, boilers and ductwork.
For the full calcium silicate range, temperature limits and strength data, see our calcium silicate insulation guide.
For adjacent material options across temperature and application ranges, explore our rock wool insulation hub.
For a deeper dive into forms, temperature ratings, and application guides, see our ceramic fiber insulation hub.
Part of the Calcium Silicate product family.
Key features
- ✓ Highest strength among hard insulation materials
- ✓ No deformation at working temperature
- ✓ Lower thermal conductivity than other hard blocks
- ✓ 100% asbestos-free
- ✓ High temperature resistance
Typical applications
- Ceramic industry: high-temperature kiln insulation
- Industrial furnaces: reducing heat loss
- Building: heat insulation and soundproofing
- Power plants: turbine and generator isolation
- Petrochemical: equipment and pipeline isolation
- Calsil board for load-bearing high-temperature industrial insulation
Technical specs
- Density
- 170-500 kg/m3
- Raw Material
- Quartz sand
- Thickness
- 25-150mm (10mm for high density)
- Bending Strength
- >=0.5 MPa
- Compressive Strength
- >=0.9 MPa
- Thermal Conductivity
- <=0.056 W/m.K
- Linear Shrinkage
- <=1.5%
- Max Working Temp.
- 650/1000/1100C
- Size
- 1000x500 / 600x300mm
- Asbestos
- 100% Non-Asbestos
Last updated: September 30, 2026
Our Factory
Calcium Silicate Board Production Line
Photos of our full‑auto calcium silicate board production workshop. View raw material preparation, forming, autoclaving, cutting and finished goods inspection. Stable large‑volume production for construction projects worldwide.
Frequently asked
What is the maximum temperature for calcium silicate insulation? +
Calcium silicate insulation boards can withstand continuous temperatures up to 1100C. They offer high compressive strength and excellent dimensional stability, making them ideal for high-temperature pipe supports, furnace backup insulation, and aluminium smelter applications.
How does calcium silicate compare to ceramic fiber? +
Calcium silicate offers significantly higher compressive strength (up to 6 MPa) than ceramic fiber blankets, making it the preferred choice for load-bearing insulation. It is supplied in rigid board form, easy to cut and machine. Ceramic fiber, however, offers higher temperature limits (up to 1430C) and lower thermal conductivity in blanket form.
Is calcium silicate asbestos-free? +
Absolutely. All our calcium silicate products are manufactured using an asbestos-free formula. They meet international health and safety standards including ASTM C533 and EN 14306, and are certified as non-hazardous material for transport and handling.
What is calsil board? +
Calsil board is a common industry abbreviation for calcium silicate board. It is the same product: a rigid, high-strength insulation board made from calcium silicate materials. Calsil board is widely used in metallurgy, petrochemical, and power generation industries for high-temperature insulation up to 1100C.
Is calsil board the same as calcium silicate board? +
Yes, calsil board and calcium silicate board are exactly the same product. 'Calsil' is simply the industry shorthand for 'calcium silicate.' Both terms refer to the same rigid insulation material manufactured from silicic and calcic compounds, rated for temperatures up to 1100C with compressive strength up to 6 MPa.
What is silicate board used for in industry? +
Silicate board, including calcium silicate board (calsil board), is used for high-temperature industrial insulation applications. Common uses include furnace and kiln backup insulation, pipe supports in petrochemical plants, turbine casings in power plants, kiln car decks in ceramic manufacturing, and electrolytic cell insulation in aluminium smelting. Its high compressive strength makes it ideal for load-bearing insulation scenarios.
What is calsil insulation board used for? +
Calsil board is the rigid, load-bearing layer in high-temperature linings: furnace and kiln backup walls, boiler casings and ducts, fire-rated walls and doors, petrochemical heater enclosures, and marine fire barriers. It is often the structural backup behind ceramic fiber or rock wool on the hot face.
What density calcium silicate board should I choose? +
Choose density by the load the board must carry. Lightly loaded backup linings and furnace walls usually use 170–240 kg/m³. Load-bearing pipe supports, structural members and fire-rated doors need the high-density grade up to 500 kg/m³ for the required compressive strength. Confirm with your project specification.
Can calcium silicate board be used outdoors or in wet areas? +
Calcium silicate board is non-hygroscopic and does not absorb significant moisture, but it is not waterproof. For outdoor, buried or wet-service use it must be protected by a weatherproof cladding or jacketing system. See our pipe insulation cladding guide for suitable jacket and vapor-barrier options.
How do you cut and install calcium silicate board? +
Cut the rigid board with carbide-tipped or abrasive tools and secure it with mechanical fixings, adhesives or stud welding depending on the substrate. It machines cleanly without special equipment. Always wear eye and respiratory protection, and seal cut edges to maintain the insulation and fire-rating performance.
What is the thermal conductivity of calsil board at high temperature? +
Calsil board thermal conductivity is low and rises with mean temperature. At the rated mean test temperature a standard board typically measures ≤ 0.056 W/(m·K); high-temperature and structural grades run about 0.065–0.100 W/(m·K). Always size thickness using the λ value at your operating temperature, not at room temperature.
Is calcium silicate board suitable for pipe supports and load-bearing use? +
Yes. Its high compressive strength — from ≥ 0.9 MPa in standard grades up to 6 MPa in high-density structural board — makes calsil the preferred load-bearing insulation. It is widely used as pipe shoes, supports and structural backup where rock wool or ceramic fiber would compress under load.
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