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European standard EN 149 defines the following classes of “filtering half masks” (also called “filtering face pieces”), that is respirators that are entirely or substantially constructed of filtering material:


Class Filter penetration limit (at 95 L/min air flow) Inward leakage
FFP1 Filters at least 80% of airborne particles <22%
FFP2 Filters at least 94% of airborne particles <8%
FFP3 Filters at least 99% of airborne particles <2%


Both European standards test filter penetration with both dry sodium chloride and paraffin oil aerosols, after storing the filters at 70 °C and ?30 °C for 24 h each. The standards also include tests on mechanical strength, breathing resistance and clogging. EN 149 also tests the inward leakage between the mask and face (ten human subjects perform five exercises each and for eight of these individuals the average measured inward leakage listed above must not be exceeded).

Segre masks conform to European standard EN 149:2001.

The standard that applies to disposable masks, EN 149:2001, is a European regulation (EN), which has been established by experts from all across Europe. The standard specifies the limits that apply to each class (P1, P2 and P3) and the methods of verification of the masks.

All masks that have been certified have been proved with solid particles and aerosols. The requirements of standard EN 149:2001 are becoming more stringent. Therefore, we recommend you to check if the protection you are using today is appropriate and complies with the regulations.

APPROVED masks under the standard can have various applications.

During a transition period 2009-2010, the standard will be supplemented by annexes that specify when we can reuse the mask. The masks can be reusable (R = reusable) or non-reusable (NR = not reusable). This information should be printed on the boxes and on the mask itself.