The Carbonate Fuel Cell is a clean and efficient power generator. Its operating temperature, ~650 C, is considered optimum to facilitate fast fuel cell reaction kinetics, utilize waste heat efficiently in a combined heat and power or bottoming power cycle, and at same time allow use of commercial commodity materials for l cell hardware and balance of plant equipment construction. The electrodes are nickel derived and the hardware materials are stainless steel based. FuelCell Energy, Inc., the world leading carbonate fuel cell developer, is currently field-testing its 250 kW and 1,000 kW size fuel cell power plants. Subscale stack endurance as well as power plant field operation results to date show that the baseline fuel cell construction materials meet the endurance goals. In parallel FCE is developing advanced materials, which would help to extend the life well beyond the present life goal. This paper will review FCE long-term material stability experience of various cell components (electrodes, electrolyte matrix, bipolar plate), stack hardware (gas manifold, flexible pipe coupling bellows, dielectric isolator, etc.) and balance-of-plant equipment. In addition, the paper will also discuss new materials results that would help to extend carbonate fuel cell life well beyond the initial goal.