Respirators for Covid and protest gas protection
Hong Kong dissenters wrote extensively about appropriate gear. Here
is what I have been able to save that they wrote before dissent there
was crushed..includes info on helmets and such
Full Face 6800 Respirators
The industry standard full face respirator mask is the 3M 6800.
Over here it's $200-$300. You used to be able to buy it through Aliexpress from
China for $40-60 (it would take a month to come), but given China crackdown on dissent they may no longer be available
And now on ebay
For those who wear glasses, a (quite expensive, haven't found it
on aliexpress) spectacles kit is available, 3M
wear one for Covid protection...a bit over the top, but I'm 75 with
numerous contributing cofactors... Why a full face mask?
Because you can get infected through the eyes (either through the air
or rubbing your eyes with infected hands). Note that it also has
a resonator, making speech more intelligible and less muffled.
This is good gear. They are relatively comfortable, easy
to put on, seal well and easily, don't fog up (the incoming air washes
the visor), good peripheral vision and aren't too hot. Made with
extremely flexible silicon rubber. I have the mask on the right,
A comment about Aliexpress: the search facility is lousy because the
listing key words are often weird or in fractured English. Keep
The 6800 masks accept a wide range of standard 6000 series
filters. The 3M catalog
For covid, all you're interested
in is particulates.
You've probably heard of N95. Here's the standardized particulate
filter rating nomenclature
The N95 are the most practical and inexpensive. You need a back
plate, a N95 particulate pad (like the 5N11) and retaining cover that
snaps over the pad to hold it in place.
Left is a simple 603 backplate with a 5N11 particulate filter, on
the right is an organic vapor cartridge (for paint fumes and the like,
6001) also with a 5N11.
For the more expensive 100% filters. They are round, need no
backplate and are a dayglo orange
A college classmate that's a biology professor at MIT has told me that
160 degrees for 30 minutes should kill covid. When I come home
from shopping I put the mask in a carefully controlled toaster oven for
40 minutes at between 155 and 170 degrees. I spray the 5N11
filters with alcohol. Write me for more details....
For protest gases, you need to
filter both organic vapor and particulates.
For the organics, you'd want a 6000 series filter cartridge, either
6001 or 6006, available for around $10-$17 per pair
Again, they may not be available from China, sp then try Ebay or Google
These filter out the organic vapors.....but to keep it from
clooging fast, you want stop the particulates first, for which you need:
- either an N95 particulate pad (like the 5N11) and
retaining cover that snaps over the cartridge to hold it in place
- or a 100% filter which requires a 502 adapter, plus
probably a 2901100% filter