OBSERVATIONS ON ELECTROSTATIC EFFECTS IN A FILTER TEST SYSTEM

Authors
  1. Coleman, J.R.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The filter test system FTS 400 was used to examine a variety of filter papers, using NaCl and DOP as aerosol challenges. In nearly every case a minimum in penetration was observed at particle size in the vicinity of 0.02 mu m . In the same region NaCl particles (but not DOP droplets) exhibited substantial in-line losses which could affect measured penetration results. Introduction of a radioactive neutralizer which removes most of the particle charge greatly reduced line losses. The effect of introducing the neutralizer on penetration was studied, using several types of filter paper. Conventional filter papers showed a slight increase in penetration over the size range up to 0.3 mu m. With electrets, which depend on electrical attraction for their effectiveness, introduction of a neutralizer increased penetration in the same range by several orders of magnitude.
Report Number
DREO-TN-87-18 — Technical Note
Date of publication
15 Jun 1987
Number of Pages
36
DSTKIM No
88-00659
CANDIS No
53901
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS;Hardcopy

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