The Hong Kong Government has just begun to give away reusable face masks known as Cu Mask to Hongkongers, 5 months after the outbreak of covid19. But Hong Kong Polytechnic University Engineering Chair Professor Wallace Leung Woon-fong, an expert in mask, revealed to Appledaily that Cu Mask has 4 serious problems. First, the copper particles of the mask are so minute that they can easily be inhaled into the lungs and become a sort of mini-time-bomb there. Second, those copper particles are so unevenly distributed that they may not be able to contact and kill viruses. Third, the filter layers of the mask is so thick that the mask's air permeability will readily decrease with washing. Fourth, The differential pressure value of the mask is as high as 4.44, which makes it unsuitable for elderly people or people with respiratory illnesses. Sophia Chan, Secretary for Food and Health, has confirmed that this mask can only fend only dust but not viruses.
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