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–1100°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 1100°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.
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.
Firebird New Material Co., Ltd offers CE-certified calcium silicate insulation boards in both 1000°C and 1100°C grades. Our boards are made from xonotlite-based calcium silicate, reinforced with high-strength glass or carbon fibers, ensuring reliable insulation, easy machining, and long-term performance in demanding applications such as aluminium, glass, steel, and cement furnaces.
Firebird’s CNC-equipped facility enables customized machining for launders, spouts, and complex components, ensuring a perfect fit and superior energy efficiency.
Calcium silicate insulation is one of the most trusted materials in modern high-temperature industries. Its combination of strength, energy efficiency, and safety makes it indispensable for furnaces, kilns, and thermal systems across aluminium, steel, glass, and cement sectors.
For reliable, high-performance insulation solutions, Firebird’s calcium silicate boards provide the durability and precision your operation demands.
