1. Air-solidified soil, with a thermal conductivity of .4 W/(m k)
Air-solidified soil is also a product system for on-site spraying construction, and its main component is magnesium oxide (MgO), an ideal high-temperature refractory, and the product does not contain any organic substances.
2. glass wool board, the thermal conductivity is .42 w/(m k)
Glass wool is a cotton-like material formed by fiberizing molten glass. Its chemical composition belongs to glass, and it is an inorganic fiber with good molding, low bulk density, poor thermal conductivity, good thermal insulation, sound absorption performance, corrosion resistance and stable chemical properties.
3. Composite magnesium aluminum silicate thermal insulation material, with thermal conductivity of .45 w/(m k)
The composite magnesium aluminum silicate thermal insulation material takes inorganic materials such as palygorskite, sepiolite, bentonite and ceramic fiber as main raw materials, and removes harmful rock wool on the basis of the original magnesium silicate thermal insulation material.
Extended information:
Generally, materials with low thermal conductivity are called thermal insulation materials (according to China's national standards, materials with thermal conductivity not more than .12 w/(m k) when the average temperature is not higher than 35℃ are called thermal insulation materials), while materials with thermal conductivity below .5 w/(m k) are called high-efficiency thermal insulation materials.
The material with high thermal conductivity has excellent thermal conductivity. When the heat flux and thickness are the same, the temperature difference between the high-temperature sidewall surface and the low-temperature sidewall surface of the material decreases with the increase of thermal conductivity.
For example, when there is no scale on the boiler tube, the temperature difference between the inner and outer walls of the steel tube is not large due to the high thermal conductivity of the steel. The temperature of the inner wall of the steel pipe is close to the water temperature in the pipe, so the temperature difference between the pipe wall (the average temperature of the inner and outer walls) will not be very high.