Which material is known for its lower thermal conductivity in fireplaces?

Soapstone is known for its lower thermal conductivity among the materials listed for use in fireplaces. This characteristic means that soapstone can absorb and retain heat longer than materials with higher thermal conductivity, such as aluminum, steel, or brick. When used in fireplace construction, soapstone can provide a more consistent heat output by slowly releasing the heat it has absorbed, which contributes to maintaining a warmer environment over time.

Additionally, soapstone has a high specific heat capacity, allowing it to store significant amounts of heat without rapidly increasing in temperature. This makes it an excellent choice for wood-burning stoves and fireplaces, as it allows for effective heating with less energy loss. The unique properties of soapstone also give it advantages in terms of durability and resistance to thermal shock, further reinforcing its suitability in high-temperature applications like fireplaces.