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The morphology and structure of FORUM ultradisperse polytetrafluoroethylene fractions obtained via separation of the initial sample with supercritical carbon dioxide are studied by means of scan ning and transmission electron microscopy, thermogravimetric and X ray structural analysis, and IR and NMR spectroscopy. The lowest molecular mass fractions of the ultradisperse polytetrafluoroethylene are involved in the dissolution process, while an increase in production parameters (pressure and temperature) entails gradual involvement of higher molecular mass oligomers in this process. On the basis of the experi mental data, the chain length of oligomers soluble in supercritical carbon dioxide is estimated.