a sulfur in oil in asphalt blend is disclosed . a polymer - free slurry of solid , elemental , sulfur in liquid oil is used to add sulfur to asphalt . addition of a slurry of solid sulfur in oil , or oil containing sulfur compounds , permits rapid and effective dispersion of the sulfur component in the asphalt . uneven mixing , which can occur when sulfur is separately added as a solid , or in molten forms to the asphalt , is avoided . the method is safer because formation of explosive clouds of sulfur dust is avoided .