What humidity level is allowed when drying SFRM for density testing?

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Multiple Choice

What humidity level is allowed when drying SFRM for density testing?

Explanation:
Moisture in the SFRM can bias density readings, because residual water adds mass without changing the material’s volume. To get a consistent, comparable dry mass, the drying environment must be controlled, specifically with a relative humidity no higher than 60%. This 60% limit is chosen as a practical upper bound that allows the coating to dry adequately while preventing excess moisture from lingering and skewing results. Higher humidity, like 70%, would risk incomplete drying and inaccurate density; lower humidity levels (such as 50% or 40%) are drier than required but still meet the rule, with 60% being the specified maximum.

Moisture in the SFRM can bias density readings, because residual water adds mass without changing the material’s volume. To get a consistent, comparable dry mass, the drying environment must be controlled, specifically with a relative humidity no higher than 60%. This 60% limit is chosen as a practical upper bound that allows the coating to dry adequately while preventing excess moisture from lingering and skewing results. Higher humidity, like 70%, would risk incomplete drying and inaccurate density; lower humidity levels (such as 50% or 40%) are drier than required but still meet the rule, with 60% being the specified maximum.

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