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.

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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 GB/T 10699
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.

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.

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

Product video

Last updated: August 14, 2026

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 GB/T 10699, 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.

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