Control of Pollutants in Museums and Archives –
2021-7-29 · An example of an indirect effect that is greatly impacted by RH, especially above 75%, is the increase in corrosion rates of many metals caused by pollutants. For example, formaldehyde does not corrode lead at 75% RH, but corrosion can occur at 100% RH (Thickett 1997). Water vapour can directly affect some materials by hydrolysis.
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