@@ -33,11 +33,14 @@ asses it to notice our users. We expect that these protective equipment lasts 3
## Filter Key Parameters to measure [[2](https://scientificfilters.com/wp-content/uploads/2016/03/BasicFiltrationConcepts.pdf)]
- Scanning Electron Microscope [SEM](https://en.wikipedia.org/wiki/Scanning_electron_microscope): This tests characterize the materials porosity. Target: < 0.1 um.
-**Update:** Camron did SEM imaging: [SEM](https://gitlab.cba.mit.edu/palomagr/wood-pulp-filter/-/blob/master/SEM.md)
- Particle Retention Rate: "In a filtration process, the particle retention efficiency of a depth-type filter is expressed in terms of the particle size (in µm) at which a retention
level of 98% of the total number of particles initially challenging the filter is
obtained". Target: 95%
- Preassure Drop: The higher the pressure drop, the harder it is to breathe. Target: <5.82 [mmH20] at a flow rate of 32 [L/min].
- We are following [FDA COVID-19 Face Mask Public Health Guidelines ](https://gitlab.cba.mit.edu/palomagr/wood-pulp-filter/-/blob/master/References/COVID19-Face-Masks-Guidance.pdf)
We are following [FDA COVID-19 Face Mask Public Health Guidelines ](https://gitlab.cba.mit.edu/palomagr/wood-pulp-filter/-/blob/master/References/COVID19-Face-Masks-Guidance.pdf)
All this tests could be replaced by a DOP ([DOP Guideline](http://www.eacoontario.com/pdf/2013/Revised%20August%2027%202013%20DOP%20PAO%20HEPA%20IntegrityTesting%20Procedure.pdf)).
