> Journal of Virological Methods
Трампистко-дебильные доктора наступают на яйца Вулаху:
Tatiana Mouravskaia Physician at Saint Barnabas Medical Center
Reposting instructions for N95 mask reuse if needed...
#protection
Forwarding this on
ATTENTION NURSES, DOCTORS, FIRST RESPONDERS, HEALTHCARE PROVIDERS, AND
ANYONE REUSING AN N95 MASK OR MAKING ONE:
I contacted Dr. Peter Tsai, the INVENTOR of the filtration fabric in the
N95 mask. N95 masks are made of polypropylene material, and are designed
to tightly fit over your face with little leakage around the edge of the
mask. I asked Dr. Tsai about reusing the N95 respirator, and what
materials could be added in homemade masks to make them more effective.
He responded with the following:
MASK REUSE METHOD #1
When reusing N95 masks, leave a used respirator in dry, atmosphere air
for 3-4 days to dry it out. Polypropylene in N95 masks is hydrophobic,
and contains zero moisture. COVID-19 needs a host to survive--it can
survive on a metal surface for up to 48 hours, on plastic for 72 hours,
and on cardboard for 24 hours. When the respirator is dry in 3-4 days,
the virus will not have survived.
Take four N95 masks, and number them (#1-4).
On day 1, use mask #1, then let it dry it out for 3-4 days.
On day 2, use mask #2, then let it dry out for 3-4 days.
Same for day 3, and day 4…
MASK REUSE METHOD #2
You can also sterilize the N95 mask by hanging it in the oven (without
contacting metal) at 70C (158F) for 30 minutes—it is reported that
COVID-19 cannot survive at 65C (149F) for 30 minutes.
Use a wood clip to hang the respirator in the kitchen oven to do the
sterilization.
When sterilizing N95 masks, be wary of using UV light--keep N95 masks
away from UV light / sunlight. N95 masks are degraded by UV light
because it damages the electrostatic charges in the polypropylene
material. It is unclear how long the masks can be exposed to UV light
before they are ineffective.
TIPS FOR REUSE METHOD #1 AND METHOD #2
DO NOT place the respirator on a metal surface, or too close to
metal--the temperature on the metal surface is higher than the air
temperature.
Keep N95 masks away from UV light / sunlight.
When removing the mask, hold the edge of the straps attached to take off
the N95 mask. Your hands may be contaminated at this time--don’t touch
the inside part of the respirator. Wash your hands with soap for 20
seconds afterward.
HOMEMADE MASKS
It is not a good idea to use cotton masks when taking care of infected
patients. The effectiveness of a material made of cotton is not
high—it’s fiber is not fine enough, and it cannot be charged. An N95
mask is so thin because it uses Polypropylene which is made of millions
of microfibers layered on top of each other that have been permanently
electrostatically charged. An electrical field ionizes the air, and
forces the ions deep into the microfibers which allows the polypropylene
to act as a filter.
However, using a HEPA filter with a face mask might increase its
effectiveness, but it may make it harder to breathe. If you place
another media over a face mask, the resistance to breathing increases—it
is the sum of the two together. When adding an extra layer, make sure it
perfectly covers the whole mask. Keep in mind it may make it more
difficult to breathe.