ACI-2X is an organic formulation designed to intensify and enhance the effectiveness of Elkem acid corrosion inhibitor in high temperature environments.

In high temperature wells, ACI-2X is added to acid formulation to extend the temperature range of most corrosion inhibitors -  up to 350°F (177°C). When used with normal hydrochloric and hydrofluoric acid, the product improves the corrosion protection at elevated temperatures on most steel grades.