| Specifications | Respiratory protection against ultrafine particles \Focus on IFA s work No. 0233\ IFA |
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| Specifications | Respiratory protection against ultrafine particles \Focus on IFA s work No. 0233\ IFA |
| Business section |
| Specifications | Respiratory protection against ultrafine particles \Focus on IFA s work No. 0233\ IFA |
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| Content | Problem Ultrafine aerosol particles (below 100 nm) arise in particular as condensation products during thermal and chemical processes. Examples are welding fumes, metal and polymer fumes, indus- trial soot, amorphous silica, and particulate diesel engine emissions. The primary particles produced measure in the order of a few nanometres (1 nm = 1 millionth of a millimetre) before clustering to form larger particles or becoming attached to larger dust particles. Scientific evidence exists of certain types of ultrafine particles presenting a health hazard. Where technical and organizational protective measures are inadequate at workplaces exhibiting large concentrations of ultrafine particles, ade- quate respiratory protective devices must be worn. Widespread concern exists that such small parti- cles might not be retained by the particle filters available on the market. Activities In order to permit assessment of the effectiveness of approved respiratory protective devices against ultrafine particles, the IFA conducted pilot meas- urements on selected respiratory filters and meas- ured the permeability characteristics of respiratory filters for harmless common salt aerosols with particle sizes of < 100 nm nm (for the greater part around 40 nm). Filters for breathing masks The number concentration following passage through the filter was measured and compared to the concentration outside the mask. The scanning mobility particle sizer (SMPS) was employed for this purpose. Results and Application Studies performed on glassfibre filters of various filter classes (P1, P2, P3) show that the relevant provisions of European standards governing the permeability are reliably met for all three perform- ance categories. The characteristics already known for particulate air filters are thus also con- firmed for respiratory protective devices. Random movement (diffusion) of the ultrafine par- ticles causes them to be filtered off inside the fil- tering layer. The principle of sieving granulate bulk material, i.e. the finer the particles, the more easily they pass, evidently fails to apply in the case of ultrafine particles. Respiratory protection against ultrafine particles 0233 Edition 2/2013 617.0-IFA:638.3 |
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| Following Datasheets | aifa0251e_2 (2 pages) aifa0265e (2 pages) aifa0276e (2 pages) aifa0277e (2 pages) aifa0293e_2 (2 pages) aifa0294e_2 (2 pages) aifa0295e_2 (2 pages) aifa0297e_2 (2 pages) aifa0299e_2 (2 pages) aifa0300e_2 (2 pages) |
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