[en] Tungsten-copper pseudo-alloy (10-20% copper) and the VNM-3-2 alloy, both obtained by powder metallurgy, have been studied as possible construction materials for blocks of biological protection functioning in air atmosphere at temperatures from 800 to 1000 deg C. The kinetics of oxydation of the alloys in the temperature range from 360 to 980 deg C was studied. Instant failure tests were carried out at 350-1000 deg C. Oxydation of the pseudo-alloy was found to consist of several stages. At first, W₁₈O₄₉ and Cu₂O oxides form at the surface. As the temperature is raised, the oxide film grows and then cracks due to exchange stresses, thus facilitating oxygen penetration to the surface of the alloy. As a result of oxygen concentration gradient in the width of the oxide film, tungsten oxide-WO₃ and copper oxide-CuO form at the surface of the pseudo-alloy. It is found that at 350-500 deg C the alloys have sufficient strength and plasticity. It appears that up to 400 deg C both compositions can be used in air atmosphere. To estimate, whether these materials can be used for blocks of biological protection at 700-1000 deg C long-term strength tests are required