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A new way is introduced to express the interaction coefficient characterizing the surface activity of fillers. The interaction coefficient is a parameter showing how many times greater a specific interaction of a testing solute with a filler surface is than a nonspecific interaction of a hypothetical alkane with the same vapor pressure. A selection of testing solutes for the determination of the interaction coefficient is discussed. Due to a high surface activity of the studied fillers for polyolefine composites, less polar solutes (furan, dichloromethane, trichloromethane, and benzene) have been selected to study these fillers. New evaluation coefficients of acidity, basicity, and acidobasicity are proposed for a rapid activity determination of a filler surface. These coefficients can be determined from a single chromatogram of the testing solutes. The surface activity of various fillers (calcium carbonate, talc, magnesium hydroxide), a s expressed by the interaction coefficient, differs so much that even the differences of surface activities in one filler type (calcium carbonate), dependent on the origin or arrangement, are conclusive.

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