| The following
charts depict laboratory test results that verify the superior filtration
efficiency and longer cartridge life realized by using Keystone pleated
microfiberglass cartridges instead of string wound or spun type depth
cartridges. All of the cartridges used in these tests were rated at
one micron. |
 |
Clean
pressure drop on the string wound cartridge is 1.5 times greater
than the pleated glass, and the spun type
cartridge has twice the pressure drop of the pleated glass.
Lower pressure drop contributes to longer cycle time between
cartridge changes. |
 |
The pleated
glass cartridge held five times the amount of test dust removed
by either the spun or string wound types of cartridges. This
test proves that the extra surface area provided by the pleated
construction translates directly into greater dirt holding capacity
and longer cartridge life. |
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