How does cold bitumen emulsion differ in formulation and application from hot-applied bitumen systems?

Cold emulsions use water as the carrier and surfactants for stability, so they are applied at much lower temperatures and rely on breaking and water evaporation to form a continuous bitumen film. Hot applied systems depend on heating bitumen to reduce viscosity and then cooling to set, which demands burners, insulated lines, and stricter burn and fire controls. Cold emulsions are more sensitive to substrate moisture, temperature, and contamination, but offer lower energy use, reduced fumes, and easier handling. Performance depends heavily on correct grade selection, surface preparation, and curing time.