In the manufacture of paints, plastics, elastomers and adhesives, good dispersion of pigments and other fillers is essential in producing a quality product. A practical method is needed to measure pigment and solution properties and relate them to dispersion. The critical surface tension of wetting of 18 commercial pigments was measured using a capillary flow technique. A relationship was found between pigment dispersion and the critical surface tension of wetting of eight representative pigments, and the surface tension of an aqueous poly(vinyl alcohol) solution. -- AATA