What Is The High-Temperature Resistance Of Calcium Silicate Board?

The conventional long-term high-temperature resistance range of calcium silicate board is 650℃–1000℃. The specific value is affected by the board type (whether it contains reinforcing fibers, density) and service scenario (short-term instantaneous high temperature or long-term continuous high temperature), and there is no unified fixed standard.

1,Ordinary Calcium Silicate Board for Construction

 Mainly used for interior partitions and ceilings, usually reinforced with pulp fibers, with low density (about 0.8–1.2g/cm³).

 The long-term high-temperature resistance is about 650℃–800℃, and it can withstand short-term instantaneous high temperature of 800℃–900℃; beyond this range, strength loss and slight shrinkage will occur.

2,High-Density Calcium Silicate Board for Industrial Use

 Used for thermal insulation and fire-resistant linings of industrial equipment, mostly added with glass fibers or mineral fibers, with higher density (1.2–1.8g/cm³).

 The long-term high-temperature resistance can reach 800℃–1000℃, which can maintain good structural stability in high-temperature environments, and is suitable for thermal insulation around boilers and kilns.

 Fiber Type：Industrial boards containing glass fibers have higher temperature resistance than construction boards containing pulp fibers; pulp fibers are easy to carbonize at high temperatures, which will reduce the board strength.

 Board Density：density, the denser the internal structure; the stronger the resistance to shrinkage and deformation at high temperatures, and the higher the upper limit of temperature resistance.

 Service Duration：When in short-term contact with high temperature (e.g., a few minutes to dozens of minutes), the upper limit of temperature resistance can be slightly higher than the long-term service temperature; long-term continuous high temperature will accelerate board aging, which needs to be strictly controlled within the recommended range.