Why are organic fibers sometimes used in refractory installations?

Organic fibers are utilized in refractory installations primarily for their ability to facilitate moisture removal during the dry-out process. When refractories are installed, especially in applications involving various binders and mixes, excess moisture can be trapped within the lining. This moisture needs to be evaporated effectively to achieve the desired mechanical properties and performance of the refractory.

Organic fibers help in this process by creating pathways for the moisture to escape more easily. They increase the porosity of the refractory matrix, allowing steam and water vapor to move out during the heating phase. This reduced moisture content enhances the integrity of the refractory as it cures and minimizes the risk of cracking or spalling, which can occur if moisture is not properly managed.

The other options, while relating to properties of refractories, do not specifically emphasize the role of organic fibers in moisture management, which is critical during the installation and dry-out phase.