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comment by Thomas Kwa (thomas-kwa) · 2020-04-24T14:45:41.647Z · LW(p) · GW(p)

A doctor I know ordered masks claiming N95, KN95, or similar certification from 7 different Chinese companies and fit-tested them (a process involving putting the mask on and spraying ~0.3μm particles of a bitter-tasting compound into the air); 6 models failed for all people tested while the last one failed for some people (indicating adequate filtration but poor fit).

comment by Stuart Anderson (stuart-anderson) · 2020-03-19T07:10:19.780Z · LW(p) · GW(p)

Replies from: Dustin

↑ comment by Dustin · 2020-03-21T01:27:18.259Z · LW(p) · GW(p)

For plenty of stuff the fact it's fake, a cheap copy, or just crappy in general isn't that much of an issue.

For example, aliexpress is widely used by hobbyists for cheap electronics components like sensors and microcontrollers.