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These light fire bricks 1800 °C/3272 °F have an extremely high temperature resistance and at the same time have a very good insulating effect and resistance to mechanical stress. They are very strong and relatively heavy. That's why I recommend them for the doors of gas fires (which sometimes have to withstand impacts), for very durable and high-temperature gas fires and for the construction of high-temperature melting furnaces.
For smelting furnaces, I recommend a two-layer construction with an under-insulation of lightweight refractory bricks 1430 °C/2606 °F.
I only recommend this construction for gas fires if the forge is designed for continuous operation and should be extremely durable. The very dense light fire bricks 1800 °C/3272 °F need longer to heat up than the lightweight refractory bricks at 1430 °C/2606 °F and 1650 °C/3002 °F. In continuous operation, the efficiency of the gas forge can be further increased by installing it with under-insulation.
Light fire bricks are suitable for a variety of applications. Unlike normal firebricks, they only absorb little energy (heat) but radiate it again. This significantly increases the efficiency of gas fires or melting furnaces, gas consumption decreases and the achievable temperature increases. The warm-up time is also drastically reduced.
I used to build gas fires with a core of high temperature ceramic fiber mat and a coating of blast furnace concrete. However, this combination has several disadvantages. Even the best ceramic fiber mat will shrink over time, creating voids under the concrete lining. The thin and often awkwardly shaped concrete coating has a strong tendency to crack after a while. As a result, in my experience, gas fires built in this way are not very durable and have to be repaired more frequently. That's why I now only use light fire bricks for the construction of gas fires and smelting furnaces.
The light fire bricks 1430 °C/2606 °F and 1650 °C/3002 °F can easily be brought into the desired shape with a saw, a rasp or sand paper. Light fire bricks 1800 °C/3272 °F can be easily processed with an angle grinder with a diamond disc.
With the right mortar, dimensionally stable and form-fitting components can be produced, e.g. combustion chambers of gas fires.
Classification temperature: 1800 °C/3272 °F
Bulk density: 1,3 g/cm³
Open porosity: 66%
Thermal conductivity at 1000°C: 1,18 W/mK
Cold compressive strength DIN51067: 10 MPa (equivalent to JM33/FL33)
Recommended mortar: light fire mortar 1800 °C/3272 °F
Dimensions: NF 1 (230x114x64mm)
Weight per stone: 2627g