Which of the following materials is commonly used as SFRM?

Spray-applied fire-resistant materials (SFRM) are designed to provide fire protection to structural elements in buildings. Gypsum is one of the most commonly used materials for this purpose due to its inherent fire-resistant properties. It is effective because it contains water molecules that, when exposed to heat, release steam, thus delaying the rise in temperature of the material and providing additional time for evacuation and firefighting measures.

Gypsum board has been widely accepted in construction, not only for its fire-resistive capabilities but also for ease of application and cost-effectiveness. It can be sprayed or applied in various thicknesses depending on the required fire-resistance rating. This adaptability is essential for meeting specific building codes and standards.

In contrast, materials like concrete, fiberglass, and wood do not have the same characteristics that make gypsum a preferred choice for SFRM. While concrete can provide some fire resistance, it is not typically sprayed and often requires forming and pouring techniques, making it less suitable for applications that call for a spray method. Fiberglass is used in construction but is not primarily known for its fireproofing abilities in SFRM applications. Wood is combustible and does not provide the necessary fire-resistance properties, making it unsuitable for use as S