Humidity control in library and archive environments is a fundamental preservation requirement for long-term conservation of diverse materials such as paper, leather, parchment, and digital storage media. Acid hydrolysis and oxidation reactions, which constitute the chemical degradation of paper, accelerate under high humidity and temperature conditions. Maintaining relative humidity at 30-50% slows the decomposition rate of cellulose chains, extending collection lifespan. Within this humidity range, mold spore germination conditions do not develop and insect activity remains at minimum levels.
Humidity fluctuations in rare book and manuscript collections are the primary driver of mechanical damage. Leather bindings harden and crack in low humidity; parchment exhibits deformation. In illuminated manuscripts, paint layers and gold leaf applications are particularly sensitive to humidity changes. Industrial humidifier systems must have precise control capacity to limit daily humidity fluctuation to 3-5% in areas housing these valuable collections.
Humidity control in digital archiving and microfilm storage areas is critical for media stability. Magnetic tapes and optical discs carry risks of hydrolytic degradation and binder degradation under high humidity conditions. Microfilm emulsions exhibit dimensional stability issues during humidity fluctuations. Maintaining relative humidity at 30-40% in these storage areas is recommended for long-term preservation of digital and analog archive media.
As NKT Humidity Control Technologies, we provide expert engineering support for library and archive facility humidity management needs with our industrial humidifier solutions. For humidification system design suitable for your facility conditions, please contact us using the form below.
