In SFRM primer qualification, which statement is true about the relationship between primer bond strength and steel bond strength?

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Multiple Choice

In SFRM primer qualification, which statement is true about the relationship between primer bond strength and steel bond strength?

In SFRM primer qualification, the key is that adhesion in the layered system remains strong and predictable. The primer must bond to the steel with a strength that is not disproportionately weaker than the bond between the SFRM and the steel. Setting the primer bond strength minimum at half of the steel bond strength ensures the primer isn’t the weak link and can effectively transfer stresses through the coating system to the steel. If the primer-to-steel bond were much weaker, delamination could occur at that interface first, compromising the fireproofing performance. Having the primer bond at or above 50% of the steel bond strength provides a conservative, practical margin. If the primer strength happens to be higher, the system still performs reliably—the criterion is about guaranteeing a minimum, not enforcing an exact equality.

In SFRM primer qualification, the key is that adhesion in the layered system remains strong and predictable. The primer must bond to the steel with a strength that is not disproportionately weaker than the bond between the SFRM and the steel. Setting the primer bond strength minimum at half of the steel bond strength ensures the primer isn’t the weak link and can effectively transfer stresses through the coating system to the steel. If the primer-to-steel bond were much weaker, delamination could occur at that interface first, compromising the fireproofing performance. Having the primer bond at or above 50% of the steel bond strength provides a conservative, practical margin. If the primer strength happens to be higher, the system still performs reliably—the criterion is about guaranteeing a minimum, not enforcing an exact equality.

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