**3. Study of the stabilized foam properties**

To confirm the stabilizing effect of SiO2 and Fe(OH)3 sols, the stability of the construction foam was investigated depending on the concentration of the dispersed phase of the sols in the solution of the protein foaming agent.

In the study, a protein foaming agent "Foamcem" was used as a foaming agent, on the basis of which a 3% aqueous solution was prepared. In addition, SiO2 sol of the industrial production "SITEC" was used, its characteristics being shown in **Table 2**. Also, Fe(OH)3 sol obtained in the laboratory was used.

Fe(OH)3 sol was obtained by the following method: 5 ml of a 10% solution of iron chloride FeCl3 was slowly poured into boiling water with a volume of 100 ml.


**Table 2.** *Main characteristics of the industrial SiO2 sol.*
