Which failure type describes a separation between SFRM and its substrate?

The type of failure that describes a separation between Spray-Applied Fire-Resistive Material (SFRM) and its substrate is adhesive failure. This occurs when the bonding agent or adhesive that holds the SFRM to the substrate fails, resulting in the material detaching or separating from the surface to which it was applied.

Adhesive failure can arise due to various factors, including improper surface preparation, moisture, inadequate application techniques, or degradation of the adhesive properties over time. Understanding this type of failure is critical in ensuring the longevity and effectiveness of fireproofing systems, as the bond between SFRM and the substrate must remain intact for the fire-protection properties to function properly.

In contrast, bond failure typically refers to any kind of failure related to the adhesion process, but it is not as specific as adhesive failure when discussing the separation between a material and its substrate. Shear failure involves a different mechanism where forces cause slippage along a plane within the material itself rather than separation at the interface. Structural failure pertains to the overall integrity of a structure, which may be influenced by many factors beyond just the fireproofing material.

Therefore, adhesive failure is the most accurate term to describe the situation of separation between SFR