Calcium silicate insulation is a white, non-asbestos, high-efficiency insulation material made from lime, silica, and reinforcing fibers. It is produced through a hydrothermal process that forms — a unique cactus-ball-like microstructure that gives the board its excellent strength, stability, and low thermal conductivity.
Known for its wide temperature range (250°C–°C) and long-term durability, calcium silicate insulation is widely used in demanding industrial applications, including furnaces, kilns, and energy systems. Let’s explore what it’s used for and why it’s essential in high-temperature industries.
Calcium silicate insulation is commonly used in boilers, turbines, chimneys, waste heat boilers, and flue gas ducts. It provides thermal protection for equipment operating at high pressure and temperature, reducing heat loss and improving overall plant efficiency.
In steelmaking, it is used for blast furnace stoves, bustle pipes, reheating furnaces, annealing furnaces, and lime kilns. Because of its compressive strength up to 5.5 MPa and thermal stability up to °C, it serves as an ideal backup insulation behind dense refractory linings, helping maintain furnace temperature and extending lining life.
High-density calcium silicate insulation plays a key role in holding furnaces, launders, spouts, end dams, and hot-top ring systems. It is non-wetting to molten aluminum, preventing metal penetration, corrosion, and sticking — significantly reducing maintenance and improving safety in foundry operations.
Used in preheater cyclones, kiln riser ducts, firing hoods, and grate coolers, calcium silicate insulation maintains stable process temperatures and reduces fuel consumption. Its lightweight structure also minimizes load on kiln shells and ducts.
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In glass melting furnaces, regenerators, annealing lehrs, and tunnel kilns, it ensures consistent insulation performance under severe thermal cycling. Its dimensional stability helps prevent cracking and deformation during long-term operation.
Calcium silicate boards are applied in reformers, gas crackers, process heaters, and pipelines. They resist chemical corrosion from fuel gases and ensure safety through non-combustibility and electrical insulation when dry.
Used as a back-up or intermediate insulation layer in heat treatment, forging, and annealing furnaces, where consistent temperature control and reduced heat loss are essential for process quality.
Because it is non-combustible and dimensionally stable, calcium silicate insulation is also used in fire doors, heat shields, and protective panels for industrial and architectural fire safety systems.
Calcium silicate materials from Promat can perfectly combine thermal insulation, fire protection and acoustic insulation. They are used to protect timber, concrete or steel structures, or as self-supporting components such as partition walls, ceilings, and ductworks. Finished with an aesthetic covering, they are an all-in-one architectural element, enabling fast building and saving space.
Promat’s calcium silicate materials are entirely safe, easy to ship, store, handle and install, which makes them the material of choice for planners, architects and applicators.
Promat’s calcium silicate materials for high temperature insulation cover the complete range of low, medium and high density and compound insulation boards. They offer a very low thermal conductivity and excellent structural support, and are resistant to moisture and chemicals. Due to their minimal thermal shrinkage they have an extended service life without loss of performance.
The excellent structural integrity of our calcium silicates makes them easily machinable and even enables the machining of complex structures. Moreover, they are easy and safe to handle, install and maintain, and can be used for new constructions as well as retrofits.
Contact us to discuss your requirements of calcium silicate insulation board. Our experienced sales team can help you identify the options that best suit your needs.