Which of the following materials is considered a type of cementitious fireproofing?

Cementitious fireproofing materials are specifically designed to provide fire resistance to structural elements, using a cement-based composition that enhances the material's ability to withstand high temperatures and prevent the spread of fire. Gypsum-based products fall under this category because they are primarily composed of gypsum, which is a type of cementitious material. These products are formulated to act as a fire barrier, protecting steel and other structural components by providing thermal insulation during a fire event.

Gypsum-based fireproofing offers durable protection while being lightweight and easy to apply. Its composition allows it to effectively delay heat transfer, thereby maintaining the structural integrity of materials underneath during fire exposure. This capability is critical in ensuring the safety and stability of structures in case of a fire, highlighting the importance of gypsum-based products in fireproofing practice.

In contrast, other materials listed in the options do not possess the characteristics associated with cementitious fireproofing. For instance, plastic coatings are typically used for protective finishes rather than for fire resistance. Mineral wool insulation is more about thermal and acoustic insulation than fireproofing. Wood-based panels, by their nature, are not suitable for fireproofing applications. Therefore, gypsum-based products stand out as the clear choice for cementitious fireproofing.