The selection of flue liner materials is a critical factor in the design and long-term performance of concrete chimneys. Different flue gas conditions demand carefully chosen materials to ensure structural integrity and durability over time. With extensive experience, we have successfully implemented a wide range of liner systems, including carbon steel, stainless steel, C-276 nickel alloy, fiberglass reinforced plastic (FRP), borosilicate glass block, and acid block—each selected to meet specific operational and environmental requirements.