The thermal conductivity of diatomite thermal insulation brick varies with specific types and test conditions. According to the search results, the following information is relevant:

I. Thermal conductivity of diatomite thermal insulation bricks with different densities:

At 300℃, the thermal conductivity of diatomite thermal insulation bricks with different densities are as follows:

Density 0.5 g/cm³: thermal conductivity 0.11 w/(m k)

Density 0.6 g/cm³: thermal conductivity 0.15 w/(m k)

Density 0.7 g/cm³: thermal conductivity 0.18 w/(m k)

Density 0.8 g/cm³: thermal conductivity 0.20 w/(m k)

Density 1.0 g/cm³: thermal conductivity 0.23 w/(m k)

II. Thermal conductivity under other test conditions:

At 400℃, the thermal conductivity of diatomite insulation brick is 0.13 ~ 0.20 w/(m k).

At 200℃, the typical thermal conductivity of diatomite insulation brick is ≤ 0.15 W/(m k).

III. Thermal conductivity in composites:

When diatomite is compounded with other materials, the thermal conductivity will change. For example, after diatomite is compounded with phase change materials, the thermal conductivity is 0.39 ~ 0.42 w/(m k).

To sum up, the thermal conductivity of diatomite thermal insulation brick is usually between 0.11 and 0.23 W/(m k), and the specific value depends on the density of the material and the test temperature.