Blue Bear Protection

Blue Bear Face Masks Filter Out 99.56% of All Particulate Matter

Blue Bear Face Masks Filter Out 99.56% of All Particulate Matter

At Blue Bear Protection, we take your safety seriously. That is why we recently hired an independent laboratory to perform tests on our Disposable Face Masks, and are very pleased to announce that our masks filter out 99.56% of all particulate matter

Nelson Labs - a Sotera Health Company - performed a Latex Particle Challenge test on May 11th, 2020 to evaluate the non-viable particle filtration efficiency (PFE) of our Disposable Face Masks. 

For those of you interested, here is a more detailed description of the testing process:

Monodispersed polystyrene latex spheres (PSL) were nebulized, dried, and passed through the test article. The particles that passed through the test article were enumerated using a laser particle counter. Three one-minute counts were performed, with the test article In the system, and the results averaged. Three one-minute control counts were performed, without a test article in the system, before and after each test article and the counts were averaged. Control counts were performed to determine the average number of particles delivered to the test article.

The filtration efficiency was calculated using the average number of particles penetrating the test article compared to the average of the control values. The procedure employed the basic particle filtration method described in ASTM F2299, with some exceptions; notably the procedure incorporated a non-neutralized challenge. In real use, particles carry a charge, thus this challenge represents a more natural state. The non-neutralized aerosol is also specified in the FDA guidance document on surgical face masks. All test method acceptance criteria were met.

Testing was performed in compliance with US FDA good manufacturing practice (GMP) regulations 21 CFR Parts 210, 211 and 820.

Results: 

Test Article #
Avg. Test Article Counts
Average Control Counts
Filtration Efficiency (%)
1
78
10,298
99.33
2
75
11,755
99.41
3
60
12,329
99.59
4
59
12,665
99.62
5
75
12,973
99.61

View full test results here

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