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Frequently Asked Question - Definition of Common Cleanroom Terms
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Challenge Aerosol An aerosol derived from the selected aerosol source material and used as the challenge for filter medium testing. Challenge aerosols are produced by one of two methods, which determine the aerosol particle size distribution characteristics. Air generated aerosols have a polydisperse nature, while thermally generated aerosols are monodisperse. Air Generated Aerosol The aerosol that results when the pneumatic force of a high velocity stream of air ) using a Laskin type atomizer) breaks up a liquid into droplets. the liquid used at room temperature is dioctylphthalate (DOP) or a specified alternative. when generated with a Laskin nozzle, the resulting DOP aerosol has a mean diameter (CMD) of approximately 0.3µm, a geometric standard deviation (GSD) of approximately 1.5, and a mass mean diameter (MMD) of approximately 0.7µm Thermally Generated Aerosol An aerosol generated by sequencing ( condensing) vapor that has been evaporated from liquid DOP(or a specified alternative) by heat. The aerosol has a light scattering mean diameter of approximately 0.3µm, with a geometric standard deviation of approximately 1.4 |
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