[en] The branch of the L. Ya. Karpov Scientific-Research Institute of Physical Chemistry and the Commercial Cooperation Association open-quotes Radtech-Eurasiaclose quotes held the 26th session of the annual seminar, traditionally dedicated to the problem of radiation stability of primarily organic materials in outer space, on May 26-28, 1992. More than 140 specialists from 49 institutes, scientific-industrial associations, enterprises, and organizations in Russia, Ukraine, Belorussia, Kazakhstan, and Latvia participated in the seminar. Forty-four papers were presented and discussed. The seminar on this subject dates back to 1971. Primarily specialists interested in the stability of materials, instruments, and systems in exposure to factors in outer space and researchers, engineers, and constructors who are developing nuclear and thermonuclear reactors, high-energy particle accelerators, radiochemical installations, and other radiation technology are interested in participating in the seminar. The subject matter of the seminar can be divided into several basic directions: (1) scientific principles of the radiation stability of organic materials; (2) methods of controlling the radiation stability of organic materials; (3) methodology for conducting accelerated laboratory tests of materials in conditions simulating the conditions of use; (4) promising organic materials with high resistance to the complex of factors in outer space; (5) prediction of the performance of materials in radiation conditions of use, development of GOST for testing the radiation stability of materials