What is the minimum number of bond tests required for treated and untreated substrates according to ASTM E736?

According to ASTM E736, the standard outlines the procedures for conducting bond tests on both treated and untreated substrates to determine the effectiveness of spray-applied fireproofing materials. The standard specifies that a minimum of five bond tests must be conducted to ensure reliable and accurate results, which reflects the statistical validity needed to assess the adhesion of the fireproofing material.

Having five tests allows for a sufficient evaluation across a sample set, providing a clearer picture regarding the performance and durability of the bond between the fireproofing material and the substrate. This number is crucial to minimize variability and ensure that the results are representative of the installation as a whole. Hence, five is established as the correct quantity for standard compliance in assessing adhesion performance.