What is the maximum allowable relative humidity when drying SFRM for density testing?

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When drying SFRM for density testing, the goal is to remove moisture from the material without ambient humidity affecting the drying process. Keeping the relative humidity at or below sixty percent helps ensure that the sample reaches a true constant mass, so the density measurement reflects the dry material rather than moisture reentering from the air. If humidity climbs higher, drying can slow or stall, and moisture from the surroundings can reabsorb into the coating, leading to inconsistent or biased density results. A lower limit like fifty percent is more restrictive than necessary for routine practice, while higher limits (seventy or eighty percent) would compromise the drying and the reliability of the density test. Therefore, sixty percent is the maximum allowable relative humidity during drying.