Factors affecting thermal conductivity of aluminum silicate fiber cotton

As we all know, aluminum silicate fiber cotton has a certain thermal insulation effect, and the thermal insulation effect is affected by the thermal conductivity. What are the factors affecting its thermal conductivity? Therefore, the editor specially asked the staff of our company and summarized the following contents.

1、 Material

The chemical middle layer, structure and aggregation state of aluminum silicate fiber. When each type of material shows alternating densities, the material with high thermal conductivity also has high thermal conductivity. The thermal conductivity generally decreases with the decrease of the material's apparent density. However, when it decreases to a certain extent, it increases rapidly with the decrease of apparent density. Therefore, the thermophysical properties of light heat insulation material aluminum silicate fiber board are characterized by very low thermal conductivity, The coefficient of thermal conductivity is very large. Humidity: the thermal conductivity of aluminum silicate fiber cotton will decrease after moisture absorption, and the experiment shows that the thermal conductivity may increase or decrease with the decrease or increase of moisture content. This is because the thermal conductivity depends on the ratio of thermal conductivity to volumetric heat capacity. When the moisture content of the material increases, both thermal conductivity and heat capacity increase. However, the increasing rate is different, which determines the variation law of thermal conductivity.

2、 Temperature

The thermal conductivity of aluminum silicate fiber cotton generally increases with the increase of temperature, but the increase is small, but the impact is small, which is generally not considered.

3、 Heat flow

If it is simply parallel or perpendicular to the fiber extension direction, the thermal conductivity is large. The aluminum silicate fiber cotton is formed by interlacing the fibers through vacuum forming, and the heat flow will not be lost along the fiber, so the thermal conductivity is small and the thermal insulation performance is good.