Mass-spectrometric investigation of gases produced by heating in vacuum fluorinated single-wall nanotubes (with fluorine content of 25 mass %) which have been kept in air was carried out. It has been shown that nanotubes, which are preliminary, treated in vacuum at 23 degrees C, being heated in the temperature range from 23 to 100 degrees C produce generally H(2)O, CO and CO(2). The gases containing fluorine appear in the range from 100 to 150 degrees C. In the range of 150-300 degrees C the mixture of disintegration products contain molecules COF(2), and in the range of 300-400 degrees C mostly CF(4) and C(4)F(6) appear. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.