2 ms·
They are airtight in this study. From the abstract: When tested with tightly sealed sides, salt-coated filters showed remarkably higher filtration efficiency t
by red0point 7y ago
They are airtight in this study. From the abstract:
When tested with tightly sealed sides, salt-coated filters showed remarkably higher filtration efficiency than conventional mask filtration layer, and 100% survival rate was observed in mice infected with virus penetrated through salt-coated filters.