Which test ensures that SFRM adheres properly to the substrate?

The adhesion test is crucial for ensuring that Spray-Applied Fire-Resistive Materials (SFRM) properly bonds to the substrate. This bonding is essential because if the SFRM does not adhere effectively, it can compromise the fire resistance performance of the material during a fire event.

The adhesion test typically involves applying a pulling force to a small area of the SFRM to determine its ability to withstand stress without delaminating or separating from the substrate. A successful test will show that the SFRM remains firmly attached, demonstrating that it has adequate mechanical properties and that the application process was effective.

In contrast, other tests, such as the setting time test, focus on how long it takes the material to cure and become firm, while the consistency test assesses the mixture's viscosity and quality before application. The color test looks at the visual quality of the material, which does not provide insight into the bond strength to the substrate. Hence, for ensuring proper adhesion, the adhesion test is the most relevant and critical.