What material is commonly used for thermal insulation due to its fibrous structure?

The material commonly used for thermal insulation due to its fibrous structure is mineral wool. This fibrous product is made from natural or recycled materials, such as rock or slag, that are melted and then spun into fibers. The fibrous nature of mineral wool allows it to trap air effectively, which is crucial for thermal insulation as air is a poor conductor of heat. This property not only helps in reducing heat loss in buildings but also provides sound insulation and fire resistance, making it a popular choice in construction and industrial applications.

Glass wool, another fibrous insulation material, has similar properties but is distinct from mineral wool. Jute, while a natural fiber, is not typically used for thermal insulation purposes, and polyurethane foam, while effective for insulation, does not have a fibrous structure and provides insulation through a different mechanism involving its cellular structure.