The Desiccant Material
Back in the fifties when the desiccant rotor dehumidifier was invented, lithium chloride salt (LiCl) was used as the main desiccant. LiCl absorbs moisture through a chemical reaction with the water molecules. Unfortunately LiCl became volatile when exposed to humid air and this often caused the salt to deliquesce (dissolve). Salt dust was carried into the airflow that was deposited on system components as a very corrosive powder. Today, most desiccant dehumidifiers use silica gel rotors. Silica gel adsorbs moisture from the air as water molecules effectively adhere to the molecules of silica gel.
The main advantage of the D-Max silica gel rotor is that it is unaffected by humid or saturated air.
Washable – without capacity loss
If a rotor is exposed to contaminated air it is important that it can easily be washed on site, without capacity loss. Returning a rotor to the manufacturer for cleaning is expensive and causes unnecessary equipment downtime. Despite manufacturers’ claims, some silica gel rotors are not washable without significant capacity loss or material softening.
The D-Max rotor is washable – without capacity loss or material softening
No bacterial growth (bacteriostatic)
Tests carried out by the Japan Food Research Laboratories on our standard silica gel rotors have shown them to be bacteriostatic. In addition, our SSCR-H rotor is both bacteriostatic and bacteriocidal.
Synthesized Silica Gel
If the silica gel is chemically bonded (synthesized) to the rotor material, the longevity is extended to (typically) in excess of 10 years. All our silica gel rotors are synthesized using metal silicates.
No dust from the rotor
Some rotors contain potential “loose” desiccant that can contaminate the air with dust particles. Apart from possible damage to products, the capacity of the rotor will soon deteriorate. Only rotors with synthesized silica gel will have no desiccant migration.
Tests by the Frauenhofer Institute have shown there is no particle mitigation from our silica gel rotors
As a consequence of an electrical power failure, residual heat from reactivation heaters have resulted in some inferior silica gel rotors to burn, causing irreparable damage to both the rotor and the dehumidifier.
The D-Max silica gel rotor is non-flammable (Test Method – ASTM E84).