Eight layers of ILC 151 in a home-sewn mask giving 95% PFE

Pic of mask with port for the PortaCount punched in.

Tests:

ILC 151 Eight layers unwashed

May 28, 2022 17:05:33

This: 95.7734%, ave so far: 95.7734%

This: 96.0388%, ave so far: 95.9066%

This: 96.1462%, ave so far: 95.9871%

This: 95.4044%, ave so far: 95.8356%

This: 95.4926%, ave so far: 95.7648%

This: 91.9200%, ave so far: 95.1518%

This: 92.5040%, ave so far: 94.7877%

This: 92.9302%, ave so far: 94.5568%

Overall Ave: 94.5568%

High: 96.1462%
Low: 91.9200%

Approximate filtration per layer

Possibility more inaccurate on the left than the right - the lower layer counts.

Test after cleaning in the top of the InstaPot electronic pressure cooker:

Dry time after pulling it out of the pressure cooker - one hour.

ILC 151 Eight layers pressure-cooker cleaned once
May 29, 2022 11:22:09Run 1: 95.5267%, ave so far: 95.5267%
Run 2: 95.4575%, ave so far: 95.4919%
Run 3: 95.8106%, ave so far: 95.5985%
Run 4: 95.9565%, ave so far: 95.6903%
Run 5: 95.7410%, ave so far: 95.7007%
Run 6: 96.1085%, ave so far: 95.7684%
Run 7: 95.6240%, ave so far: 95.7477%
Run 8: 95.8268%, ave so far: 95.7576%
Overall Average: 95.7576%
High: 96.1085%
Low: 95.4575%

Verdict

Very breathable without collapse onto face. I'm middle aged and can fill my lungs from empty in under half a second. That didn't change after the cleaning in the pressure cooker.

Next steps

Four more goes through the pressure cooker.  Maybe a little more scientific in the process, too.

Pattern:

Fabric Datasheet