1.1 This specification covers requirements for the fluorocarbon terpolymer elastomer used in the manufacture of expansion joints for use in coal-fired utilities and other high temperature industrial applications in which corrosive flue gases are presen This specification covers high-temperature and acid-resistant fluorocarbon terpolymer elastomers used in the manufacture of expansion joints for coal-fired utilities and other high-temperature industrial applications in which corrosive flue gases are p