Asphalt emulsions are an energy efficient and cost effective way to pave the streets. It is three ingredients: asphalt, water, and an emulsifying agent. Minute globules of asphalt are suspended in water by using an emulsifying agent. These asphalt globules are either anionic (negatively charged) or cationic (positively charged). Emulsifying agents can vary in chemical properties depending on the compounds used. This affects suspension and controls how long it takes for asphalt to break down. The chemical compatibility of the emulsifying agent is essential for producing a stable emulsion.