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.

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

See 'Specification' tab for more information on Prosorb. 40% and 60% cassettes available as a special order, please contact PEL directly.

Code Description Pack Size Price Stock QTY
P857-8045 857-8045 Prosorb Full-Size Cassette 45% RH Each £48.00 (ex VAT) In Stock
P857-8050 857-8050 Prosorb Full-Size Cassette 50% RH Each £48.00 (ex VAT) In Stock
P857-8055 857-8055 Prosorb Full-Size Cassette 55% RH Each £48.00 (ex VAT) In Stock
P857-8245 857-8245 Prosorb Half-Size Cassette 45% RH Each £29.00 (ex VAT) In Stock
P857-8250 857-8250 Prosorb Half-Size Cassette 50% RH Each £29.00 (ex VAT) In Stock
P857-8255 857-8255 Prosorb Half-Size Cassette 55% RH Each £29.00 (ex VAT) In Stock
Specification Recommended Alternatives
  • 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.
Code Description Pack Size Price Stock QTY
P167-2739 167-2739 Display Case Hygrometer - Celsius Each £19.95 (ex VAT) In Stock
P9903-7150 9903-7150 Thermohygrometer Tinytag Each £195.00 (ex VAT) In Stock
P952-6000 952-6000 Thermohygrometer Each £79.95 (ex VAT) In Stock
P952-CAL 952-CAL Thermohygrometer Initial Calibration Certificate Each £95.00 (ex VAT) Made to Order
P952-2520 952-2520 Whirling Hygrometer with Carry Case Each £53.80 (ex VAT) In Stock
P952-2525 952-2525 Spare Wick/Sleeve Whirling Hygrometer 952-2520 Pkg 25 £5.60 (ex VAT) In Stock
P952-2529 952-2529 Thermometer Spare Red Spirit for Whirling/Mason Hygrometer Each £8.75 (ex VAT) In Stock
P684-765 684-765 Environmental Meter for Temp., RH, UV, and Lux Each £574.00 (ex VAT) In Stock
P684-765C 684-765C Environmental Monitor with Data Logging Each £694.00 (ex VAT) In Stock
P684-7657 684-7657 RH Test Kit for 684-765 Environmental Monitor Each £120.00 (ex VAT) In Stock
P684-765C 684-765C Environmental Monitor with Data Logging Each £694.00 (ex VAT) In Stock
P857-1919 857-1919 Art-Sorb Sheet 50% RH 500 x 500 x 2mm Each £22.35 (ex VAT) In Stock
P857-1919/20 857-1919/20 Art-Sorb Sheets 50% RH 500 x 500 x 2mm Pkg 20 £389.00 (ex VAT) In Stock