Adsorbent Recirculation Filter (ARF)0 pages

ADSORBENT RECIRCULATION
FILTER (ARF)
Disk Drive

DESCRIPTION
The Adsorbent Recirculation Filter (ARF)
is comprised of an adsorbent element
encapsulated between two layers
of electrostatic filtration media and
protective scrim.

PRINCIPLE OF OPERATION
The ARF is designed to provide protection
from particles, hydrocarbons, and acid
gases. Its location, directly in the airstream
generated by the rotating disks, allows
superior chemical and particulate cleanup
time. The electrostatic filtration media and
protective scrim provide particle filtration
and encapsulate the adsorbent element. The
adsorbent element is specially formulated
to adsorb acid gases and hydrocarbons. The
most common adsorbent and its associated
functions is:
•t Chemically Treated Activated
Carbon: Adsorption of acid gases and
hydrocarbons
•t Activated Carbon: Adsorption of
hydrocarbons

INSTALLATION IN DRIVE
The ARF is located directly in the path of
the airflow generated by the rotating disks.
In a disk drive, this location is typically the
opposite the read/write arm. The installation
of the filter into the drive can be accomplished
by several techniques. The most common
method is to slide the filter into a holder
integral to the base casting. Alternative
methods include inserting the filter into a slot
in a plastic bracket or ultrasonically welding
the filter to the plastic bracket. The plastic
bracket, in turn, is custom designed to fit into
the base casting.

Scrim

Electrostatic Media

Adsorbent Material