The results of laboratory and bench tests of UGET and FUT antifriction carbon plastics macromodified with polytetrafluoroethylene (PTFE) are presented. The efficiency (reduction in the friction coefficient) of such modification of carbon plastics has been confirmed. The dependence of the efficiency of this method on the design of sliding friction units has been established. The plastic deformation of PTFE is the key factor that determines the efficiency of the modifier in the design of sliding bearings. The design of a friction unit should eliminate the pressure gradient in the PTFE protectors and prevent the possibility of an uncontrolled outward flow of PTFE from the friction zone.