RE: Key part for me on RNS18 Jan 2021 09:54
"As ettrading said: ****All the hard tests passed***, breathability etc.....the 5th test, is a formality....they know already the material in the mask will pass before using it....just need to checked off......"
Actually, they don't know about biocompatibility - which is why the test is required. Wearing masks for long periods of time can cause all sorts of issues, as those clinicians (including my other half*) and support staff, know all to well.
*He failed his mask fit and is hood trained instead.