What is the standard bond strength of SFRM required for primer qualification?

The standard bond strength of Spray-Applied Fire-Resistive Materials (SFRM) required for primer qualification is established to ensure that the fireproofing remains adhered to the substrate it is applied to. The requirement is that the bond strength must be equal to or greater than half of the bond strength on steel.

This standard is critical because it ensures that the fireproofing material can withstand the conditions it will encounter in service, including temperature fluctuations, moisture, and structural movements. By setting the benchmark as half of the bond strength on steel, it accounts for the differing physical and thermal properties of the various substrates the fireproofing may be applied to.

In essence, this requirement helps maintain the structural integrity and effectiveness of fireproofing systems, ensuring they perform as intended in the event of a fire.