In the course of the Covid 19 pandemic, protective masks are on everyone's mouth. Terms such as protection class FFP-2, which previously mostly only appeared in safety instructions or technical articles, are now familiar to a broad public. The various initiatives for the production of improvised masks and, last but not least, the introduction of a compulsory wearing of masks led to a broad discussion about the most diverse materials as protection against infections. Due to the scarcity of reliable protective masks for hospital and nursing staff, the question of the recommended wearing time is also being intensively discussed.

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