Accession Number : ADA188797

Title :   Observations on Electrostatic Effects in a Filter Test System.

Descriptive Note : Technical note,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Coleman, John R

PDF Url : ADA188797

Report Date : Jun 1987

Pagination or Media Count : 36

Abstract : The filter test system FTS 400 was used to examine a variety of filter papers, using sodium chloride and dioctylphthalate as aerosols challenges. In nearly every case of minimum in penetration was observed at particle size in the vicinity of 0.02 micrometers. In the same region NaC1 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 slight increase in penetration over the size range up to 0.3 micrometers. 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.

Descriptors :   *ELECTROSTATICS, *FILTER PAPER, AEROSOLS, DROPS, ELECTRETS, FILTERS, LOSSES, NEUTRALIZATION, PARTICLE SIZE, PENETRATION, RADIOACTIVITY, REDUCTION, SODIUM CHLORIDE, CANADA

Subject Categories : Wood, Paper and Related Forestry Products

Distribution Statement : APPROVED FOR PUBLIC RELEASE