Abstract
The static boundary frictions were measured when some binary or ternary mixtures were placed on the glass surfaces. The results suggest that: (i) the friction is governed by the surfaces with adsorbed layer of lubricant, and (ii) the reducing power of friction depends upon the individual molecular constitution of the molecules which are adsorbed preferentially by the friction surface, rather than the stability of the film. Selective adsorption by the glass surface has been investigated, and some examples has been reported.