neb: That's the same supply-chain problems that electronics people have been dealing with for a decade or more when dealing with Chinese-made electronics, if you can do a cheap fake of something or cut out safety/reliability features to save cost it'll be done. It'll be totally bargain-priced, but also crap - google "chinesium". So you need to either buy directly from a known-good vendor and supplier (e.g. for power supplies Meanwell via Element14/Farnell) or field-qualify anything that's shipped to you.
Thanks, I'm familiar with that. There are high qual manufacturer.
Guys, I don't talk about Alibaba, ebay or something like that. I talk about a huge order in the range of 5 Mill. masks arranged by the German military on behalf of the health authorities. Not all batches are affected by quality issues - but how can you trust from one mask ok to another not ok? I mean, it's personal protection stuff - not cheap RGB thingies. The samples were ok, but the delivery later on?