Evotherm is a product developed by MeadWestvaco Asphalt Innovations, Charleston, South Carolina. Evotherm uses a chemical additive technology and a "Dispersed Asphalt Technology" delivery system. MeadWestvaco states that by using this technology a unique chemistry customized for aggregate compatibility is delivered into a dispersed asphalt phase (emulsion). During production, the asphalt emulsion with Evotherm chemical package is used in place of the traditional asphalt binder. The emulsion is then mixed with the aggregate in the HMA plant. MeadWestvaco reports that this chemistry provides aggregate coating, workability, adhesion, and improved compaction with no change in materials or job mix formula required.

MeadWestvaco reports that field testing has demonstrated a 100° F reduction in production temperatures. MeadWestvaco also reports that the decreased production temperatures of the Evotherm process can lead to plant energy savings of 55 percent; which results in a 45 percent reduction in CO₂ and SO₂ emissions, a 60% reduction in NOX, a 41% reduction in total organic material, and benzene soluble fractions below detectable limits.