In most industrial furnace systems, ceramic fiber boards are widely used for insulation in hot-face zones. However, the true measure of their reliability isn’t simply their labeled temperature rating—it’s whether the material can maintain structural integrity during continuous high-temperature operation without collapsing, shrinking, or edge cracking. This is where the value of Long Keter refractory ceramic fiber board truly stands out.

Long Keter boards deliver superior thermal performance thanks to three key process controls:

    High Alumina Content: Increases skeletal strength at elevated temperatures.

    Fully Automated Press Molding: Ensures uniform fiber distribution and consistent board density, minimizing internal stress concentration and structural fatigue.

    Two-Hour Deep Drying Process: Guarantees even moisture removal, reducing the risk of post-drying cracking and delamination.

As a result, our ceramic fiber boards maintain a shrinkage rate of less than 3% across a working temperature range of 1100–1430°C (2012–2600°F). This means the board retains its original thickness and fit even after months of continuous operation—ensuring that the insulation layer doesn’t collapse, detach, or form thermal bridges.

In a recent metal heat treatment equipment upgrade, a customer reported that the original ceramic fiber board installed in the furnace roof began to crack and sag after only three months of continuous use, leading to increased shell temperature, energy loss, and frequent maintenance shutdowns.

After switching to Long Keter high-temperature insulation board, the system ran continuously for six months without structural issues. The furnace shell temperature dropped by approximately 25°C, thermal efficiency improved by nearly 12%, and maintenance intervals extended from once a month to once every quarter—resulting in a significant reduction in operating costs.

So yes, ceramic fiber is used for insulation. But a truly trustworthy ceramic fiber board must be validated through long-term performance in high-temperature systems.