3M Aura™ Particulate Respirator, FFP2, Unvalved, Bulk, 9320D+

Clogging:
For dust masks used during one shift
(NR), the clogging test is optional. For reusable
dust masks (R), this test is mandatory. The dust masks
are filled with a very large amount of dolomite dust,
which may clog the filter. After filling with the
required amount of dust, the breathing resistance of the
dust masks not exceed the limit values.

Marking:
NR = Not reusable (only for use during one shift)
D = Meets clogging requirements