Abstract <p> Using methods of electrical conductivity, photosedimentometry, viscometry, and optical microscopy, the regions of relative stability of highly concentrated oil-in-water emulsions of an epoxy oligomer were determined. These emulsions were prepared with nonionic surfactants as emulsifiers and high-molecular-weight compounds or solid microparticles (synthetic latexes and mineral powders) as stabilizers. The introduction of stabilizers significantly affected the size and mass distributions of dispersed-phase droplets, depending on the chemical nature, size, and concentration of the solid microparticles. This led to a marked improvement in the aggregative and sedimentation stability of the emulsions and enhanced their film-forming ability. The films and coatings obtained by curing these emulsions were comparable in physicochemical and operational properties to those produced from epoxy resin solutions in organic solvents.</p>