Van Air Activated Alumina Desiccant

Activated alumina is a porous form of aluminum oxide. It has a high surface area which adsorbs vapors without any change in form. Activated aluminas will not soften or disintegrate easily when immersed in water.

Dew points to -40°F and lower may be achieved with activated alumina depending on dryer design and operating conditions.

  • The 1/8″ (2-5mm) activated alumina bead is the size most frequently used in regenerative dryers.
  • The 3/16″ (4-8mm) activated alumina bead is used when pressure drop and surface area requirements fall between 1/8” and 1/4” material. It is suitable for most systems.
  • The 1/4″ (5-10mm) activated alumina bead is used both as a pre-bed material to support large desiccant beds or as a buffer for silica gel beads. Pressure drop is slightly lower than 1/8” (2-5mm) material.

If size is not known or specified, the 1/8” (2-5mm) size is usually satisfactory. However, if activated alumina is used in a regenerative dryer and the desiccant retaining screens cannot be measured, the 1/4” (5-10mm) size should be used as a bed support (6” layer). If at all possible, obtain a sample material and measure it before ordering.


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