PROBLEM OF MASS TRANSFER IN THE CASE OF SUPERDEEP PENETRATIONS. K. Andilevko UDC 534.2 The loss in the mass of a particle in the process of its motion in the material of an obstacle is estimated on the basis of the superdeep-penetration model. A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 76, No. 2, pp. 19-23, March-April, 2003. Original article submitted October 21, 2002.