What is the allowable test cap diameter range when testing SFRM bond strength?

The allowable test cap diameter range for testing Spray-Applied Fire-Resistive Materials (SFRM) bond strength is between 2 to 3-1/4 inches. This range is specified to ensure that the test adequately represents the bond strength of the fireproofing material applied to structural elements. A cap that is too small may not provide sufficient surface area for accurate testing, while one that is too large might influence the results due to variations in substrate or curing conditions.

Remaining within the specified range allows for consistency in testing procedures and results, enabling reliable comparisons across different applications and materials. This guideline helps ensure that the tested samples reflect the real-world application conditions for the SFRM, supporting safety and performance standards in fire prevention.