Which material is commonly used in chimney flue linings for its durability?

Terra cotta is commonly used in chimney flue linings due to its excellent durability and heat resistance. This clay-based material can withstand high temperatures and is effective in preventing heat and corrosive flue gases from damaging the surrounding structure of the chimney. Terra cotta flue liners help to protect against the buildup of creosote and other hazardous byproducts during combustion, enhancing both safety and longevity. In addition, terra cotta is relatively easy to install and offers good insulating properties, which helps maintain the efficiency of the chimney system.

Other materials like aluminum and vinyl do not possess the same high-temperature resistance required for chimney applications, making them unsuitable for flue linings. Brick, while strong and durable, is typically used for the chimney structure itself rather than as a lining material. Therefore, terra cotta stands out as the optimal choice for flue linings in terms of durability and safety.