Museums – Preservation of Artefacts

Desiccant Dehumidifiers in Museums

Moisture is a major enemy in the fight to preserve antiques and artefacts that form an important part of our heritage.

Paintings, furniture, linens and other organic materials contain micro organisms which thrive and multiply in high humidity conditions – invariably causing irreversible damage.

Valuable metallic objects and structures stored in museums are susceptible to oxidisation and corrosive degradation.

To avoid expensive and complicated restoration costs, environmental conditions (which are naturally aggressive), will require adjustment and control. If the relative humidity is maintained within limits using a desiccant dehumidifier, no micro organism or bacteria activity will occur and metallic surfaces will be free from corrosion.

Our heritage can easily be protected against degradation for future generations to appreciate.


Expressed as a percentage, the Equilibrium Moisture Content is the percentage of the material’s weight that is made up by water. For example, if an object has an EMC of 10% at 40% RH, then there are 10 grams of water in every 100 grams of material once it has stabilised with the environment.

EMC is therefore determined by the specific properties of a material and the relative humidity of the environment.


Expressed as a percentage, Equilibrium Relative Humidity is the relative humidity of the air at which a material is neither gaining or losing moisture for a given EMC.

Using the above example, if the material is to be maintained at an EMC of 10%, then the RH of the air should be 40% (ERH).

Contact us today to see how we can provide your business with humidity control solutions.