PROSorb is a silica gel ideally suited for stabilizing relative humidity inside museum display cases and storage cabinets.

The ideal level of humidity for most museum display cases and storage cabinets is a level between 40 - 60% RH (Relative Humidity). It is also desirable to maintain this level for as long as possible.

PROSorb has a unique and exceptional adsorption capacity within the 40 - 60% RH range and surpasses all other products sold for this purpose.

PROSorb is able to maintain a stable RH within narrow margins through its ability to both absorb and desorb water vapour; and is provided pre-conditioned to your desired humidity level.

Further advantages of PROSorb:

PROSorb consists of 97% SiO₂ und 3% Al₂O₃.

High bulk density: 1 kg PROSorb only needs a volume of ca. 1.5

Long term stability: PROSorb maintains its adsorption capacity longer than other products. After 10 years we found adsorption capacity of PRO SORB to have decreased by around 20%. In other words: PRO SORB conditioned to 50% RH and maintained at constant weight (e.g. sealed in an aluminum bag) would increase its conditioning by around 0,8 - 1 % RH per year (experimental values after 5 and 10 years). Values might depend on ambient conditions.

Temperature dependency: PROSorb  is conditioned in relation to temperature. PROSorb reacts in the same way organic materials do. Therefore there will be no, or little, transfer of water vapour between organic materials and PROSorb if the temperature changes. Under fluctuating temperatures, this property protects wooden objects and other organic materials from swelling or shrinking: The conditioning indicated on the labels refers to 20°C. At 10°C the conditioning of the cassettes will be around 1 – 1.5% RH lower, at 30°C around 1 – 1.5% RH higher.

Dimensions / Weight

Full size cassette:

Dimensions 335x110x44mm Weight 950g

Half size cassette:

Dimensions 335x110x24mm Weight 500g