What type of failure occurs when SFRM peels away from steel?

The type of failure that occurs when Spray-Applied Fire-Resistive Material (SFRM) peels away from steel is classified as adhesive failure. This type of failure specifically refers to the bond between the SFRM and the steel substrate weakening to the point that the fireproofing material no longer adheres effectively, leading to the separation of the two materials.

Adhesive failure is often the result of insufficient surface preparation, inadequate bonding agents, or environmental conditions that affect the adhesion capability of the materials involved. Recognizing adhesive failure is crucial in fireproofing applications, as it can significantly compromise the fire resistance of steel structures, allowing for increased heat exposure and elevated risk during a fire.

In contrast, other types of failures such as mechanical, thermal, or structural are related to different mechanisms. Mechanical failures might occur due to physical impact or stress, thermal failures deal with the material's performance under high temperatures, and structural failures relate to the overall integrity of a building or component under load stresses. Each of these types is distinct from adhesive failure, which is focused solely on the bond between materials.