During the drying process of SFRM for density testing, what is the maximum allowable relative humidity?

The maximum allowable relative humidity during the drying process of Spray-Applied Fire-Resistive Materials (SFRM) for density testing is crucial because it can significantly affect the accuracy of density measurements. A relative humidity of up to 60% allows the sprayed material to dry adequately without moisture interference, which can skew results and lead to inaccurate density readings.

Higher humidity levels can prevent the material from drying properly, causing potential discrepancies in the density calculation. Maintaining a relative humidity of 60% or below ensures that the SFRM will cure effectively, allowing for reliable evaluations during testing. This standard is established in accordance with testing protocols and practices to ensure the performance and safety of fireproofing materials used in construction.

In contrast, options reflecting lower humidity percentages would not accommodate conditions that might be commonly encountered in various environments, potentially making them impractical or unnecessarily restrictive.