What is the maximum relative humidity of a drying oven when drying SFRM density samples?

The maximum relative humidity of a drying oven when drying Spray-Applied Fire-Resistive Materials (SFRM) density samples is set at 60%. This criterion is important because higher humidity levels can negatively impact the drying process, leading to inaccurate density readings. A lower humidity environment helps ensure that the moisture content in the samples is effectively reduced, allowing for reliable test results.

Maintaining the correct humidity level is critical in testing because excessive moisture can alter the characteristics of the material being tested and may result in the formation of water-related defects within the sample. This underscores the importance of adhering to the specified maximum relative humidity in order to achieve consistent and valid testing outcomes.