Abstract
Abstract The performance characteristics of six Bureau of Mines approved and six non-approved respirators were evaluated against seven different dust aerosols. Silica, silicate polishing compound, cement, sulfur, lead, iron and zinc aerosols were used. Approved respirators permitted less particulate penetration of the filters, however some approved respirators failed to meet tests carried out in accordance with the Bureau of Mines approval schedules. Approved respirators were fairly uniform in performance, with few exceptions, but non-approved respirators varied widely in performance. The respirators tested represented a wide range of filter materials and filtering areas.
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