Prosorb Humidity Control - Cassettes

Humidity control cassettes from Prosorb present an easy way of maintaining a stable relative humidity level in display cases and cabinets.

Supplied as a complete unit, the prosorb cassettes require no additional containers or trays. Pre-filled with Prosorb beads, the cassettes are constructed from a sturdy polypropylene case with vapour permeable non-woven polyester panels.

Dependent upon the desired RH (relative humidity) '%' required, we have cassettes preconditioned to satisfy the ideal level for museum display cabinets, generally in the range of 40% to 60%. The enclosed Prosorb beads will absorb and desorb water vapour, as appropriate, to stabilise the humidity.

As with any other humidity control, it is important to monitor the environment using a hygrometer as reconditioning may be required after an extended period. Clay packs are available for reconditioning, see accessories below, for more details see here

Prosorb Cassette Sizes

Full-size Cassettes:

• Dimensions: L 335 mm, W 110 mm, H 44 mm.
• Content: 950 g beads. One or more cassettes per cubic metre of air volume are required depending on circumstances of application

Half-size cassettes:

• Dimensions: L 335 mm, W 110 mm, H 24 mm.
• Content: 500 g beads. One half-size cassette will be sufficient for 0,7 m3 depending on circumstances of application

• Free of chlorides: PROSorb contains no lithium chloride, as some other products do (Lithium chloride is a chemical - salt, potentially harmful to many metals. This salt can be transferred to metals in dust or by human touch). PROSorb consists of 97% SiO2 and 3% Al2O3.
• Low abrasion: PROSorb beads produce less dust than other silica gels (abrasion < 0,05 weight-% according to MIL-D).
• High bulk density: 1 kg PROSorb only needs a volume of ca. 1,5 l (much less than some other silica gels).
• Long term stability: PROSorb maintains the greater part of its capacity well beyond the 2-5 years when other silica gels have lost a large portion of their capacity.
• Economical: PROSorb is much cheaper than the other products sold for the same purpose.
• 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.