Testing and marking

Filtering half masks are tested and approved according to EN 149:2001+A1:2009. Paraffin oil as an aerosol is used in the test to simulate particles, i.e. masks are exposed to liquid particles, which are normally harder to filter than solid particles with this type of mask. Also, breathing resistance must not exceed specified levels at different airflows.

Filtering half masks can also undergo a Dolomite test according to EN 149:2001+A1:2009, which simulates a heightened level of solid particles similar to situations in e.g. a mine. Masks which after the Dolomite test meet the requirements for filtration efficiency and breathing resistance may be marked D.

Masks marked R = Reusable. These may be used for more than one shift, provided that the manufacturer provides instruction about how the mask should be cleaned. The Dolomite test is mandatory in order to mark masks with R.

Masks marked NR = Not Reusable. These may be used at most during just one work shift and are then discarded. The Dolomite test is optional for masks marked NR.

If the mask is damaged or a sensation of increased breathing resistance is experienced the mask must always be replaced.


Filtering half masks that have been tested and approved according to EN 149:2001+A1:2009 shall at a minimum be marked with:

  • Name/brand/other that identifies the manufacturer/distributor
  • Type of mask and protection class
  • Number and year of publication of the EN standard
  • The CE symbol and designation of the notified body

Batch marking can be included as a supplement.