Which of the following conditions must be met for a successful application of TFIFRM?

For a successful application of TFIFRM (Thin Film Intumescent Fire-Resistive Material), achieving a stabilized condition is crucial. This means that the substrate to which the fireproofing material is applied must be in a consistent state, free from extreme variables that could affect the application process and the final performance of the material.

When the substrate is stabilized, it allows for optimal adhesion and the effectiveness of the fire-resistant properties of the TFIFRM to be realized. A stabilized condition helps ensure that the application thickness is consistent and that any environmental factors that could compromise the curing or bonding process are minimized.

In contrast, conditions such as high humidity or low temperatures can adversely affect the application and performance of TFIFRM, leading to potential failures in fire resistance. Similarly, having a dry surface, while generally preferred, doesn't address the overall stability of the working environment and the substrate's condition. Thus, a stabilized condition is the key requirement for a successful application.