Activated Alumina Desiccant in 1/8" (2-5mm) bead is the size most frequently used in compressed air dryers. 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.

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).

Activated Alumina Desiccant in 3/16" (4-8mm) bead is used when pressure drop and surface area requirements fall between 1/8” and 1/4” material. It is suitable for most systems. Activated alumina desiccant is a porous form of aluminum oxide. It has a high surface area which adsorbs vapors without any change in form. Activated alumina 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.

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).

Activated Alumina Desiccant in 1/4" (5-10mm) bead alumina 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) 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 alumina desiccant 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.

If size is not known or specified, the 1/8” (2-5mm) desiccant 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).