The United States expanded the scope of sanctions on Iran's metals sector to include those who knowingly transfer materials on a 22-item list to Iran, including aluminum powder with a purity above 98 percent. These materials may be used in Iran's military, nuclear, or ballistic missile programs, according to the U.S. State Department. The United States may also sanction those who knowingly transfer certain materials to Iran's construction sector because it is controlled by the Islamic Revolutionary Guard Corps (IRGC). These materials include graphite and raw and semi-finished metals.