It's written on the box they come in.
Translatted text with Google:
WARNING Appropriate wearing of this hygiene mask in combination with good hygiene practices (hand washing, maintaining distance, etc.) helps to minimize the transfer of airborne and / or wet particles. This hygiene mask is not a medical device within the meaning of Directive 93/42 / EEC or of Regulation (EU) 2017/745, nor an individual protection device within the meaning of Regulation (EU) 2016/425. This mask offers no protection to the lungs or respiratory tract. This mask only offers comfort in the presence of non-harmful dust, both in terms of concentration and of its nature. This mask does not provide any protection against substances that are harmful, toxic or dangerous to health in themselves or their concentrations, particularly in the form of particles, dust, smoke, a cloud of particles, fibers (asbestos , glass wool or rock wool), gas, vapor or microbiological pollution, in particular batteries, viruses, spores or molds. Misuse of this mask can cause illness and even death. For proper use, consult. vvww.ab-safety.eu For any further information, please contact our customer service.
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