Test of FFP2 masks, regardless of European or American standard, is subject to a TSI-8130 Automated Filter Testers instrument, USA. American standard N class uses NaCl method, R class uses DOP method, European standard uses DOP method.
TSI-8130 instrument with NaCl method: the instrument can automatically produce salt particles, particle average diameter of 0.2μm(aggregation average diameter of 0.26μm, arithmetic average diameter of 0.07μm) by set in a certain flow through the sample, the instrument automatically print the flow, resistance, transmittance.
DOP method, using DOP oil dust, DOP oil particle diameter is 0.33μm aggregation average diameter, counting average diameter 0.20μm.
Different types of FFP2 masks use different filtering materials. Filtration effect is related to particle size on the one hand, but also affected by whether the particle contains oil. FFP2 masks are usually graded according to filtration efficiency and are classified according to their suitability for filtering oily particles. Oil-free particles such as dust, water-based fog, paint fog, oil-free smoke (welding smoke), microorganisms, etc. "Non-oily particulate matter" filter materials are more common, but they are not suitable for oily particulate matter, such as oil fog, lampblack, asphalt smoke, coke oven smoke, etc.. The filter material suitable for oily particles can also be used for non-oily particles.
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