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Aerosol Penetration Through Protective Fabrics
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) HUMAN PROTECTION AND PERFORMANCE DIV
Pagination or Media Count:
The aerosol penetration efficiency and quality factor for three Chemical Biological Radiological protective fabrics were evaluated using a particle counting technique. Both parameters characterise aerosol penetration through tested material the latter accounts for the effect of fabrics air permeability. The overall and size dependent penetrations of 0.03-3 micrometers sized Sodium Chloride NaCl and Di-Ethyl-Hexyl-Sebacate DEHS aerosols were measured through fabrics at three different constant air face velocities 5, 10 and 25 cms. Penetration was size dependent with the most penetrating particle size MPPS at about 0.5 micrometers. Increasing the air face velocity increased the penetration of ultrafine particles, decreased penetration of the supermicrometer particles and shifted the MPPS towards smaller diameters. The quality factors were governed by air permeability. The fabrics with higher permeability showed higher quality factor values, thus indicating better protection for a given air pressure drop. The observed dependencies were generally in good agreement with air filtration theory.
APPROVED FOR PUBLIC RELEASE