Which property is crucial for fibers classified as asbestiform?

Fibers classified as asbestiform possess a crucial property of high tensile strength. This characteristic refers to the ability of these fibers to withstand significant amounts of tension without breaking. High tensile strength is essential because it contributes to the durability and structural integrity of materials that contain asbestos. In applications such as insulation, fireproofing, and construction, the fibers' strength ensures that they can maintain their form and function under stress, making them valuable in various industrial uses.

While other properties, such as high thermal resistance and low density, may also be associated with certain materials containing asbestos, high tensile strength is a defining feature of asbestiform fibers specifically. These fibers not only need to be stable at high temperatures but also need to retain their structural integrity under physical loads.