An ASTM F3502 facemask has to pass rigorous laboratory testing before it can be labelled as compliant. In addition to filtering a critical mass of fine aerosols, an F3502 mask must be significantly more breathable than a medical respirator. The filtration and breathability scores go right on the ASTM-approved label so you can see exactly how the mask strikes the balance between comfort and protection.
Puraka is proud to offer its Essential line of F3502-compliant masks. Even without a filter, these premium-quality facemasks exceed the level one requirements for breathability and filtration. With the filter, the bacterial filtration efficiency increases to 98%, without significantly impacting the breathability. In fact, here's our F3502-21 label, so you can see for yourself. Click here to download our F3502 laboratory results.
[Infographic Text: ASTM F3502 Mask Labels, Explained. Specification for Barrier Face Covering. Two levels of performance: Filtration Efficiency (Higher = Better): <20% Fail, >20% Level 1, >50% Level 2. Breathability (Lower = Better): <5mm level 2, <15mm Level, >15mm Fail. N( respirators have an exhalation limit of 35mm.
Wait, isn't 20% kind of low? 20% sounds low, but the filtration efficiency score is for sub-micron particles, even smaller than a virus! Larger airborne particles are filtered at exponentially greater rates. In other words, The bigger the particle, the easier it is to capture! Graph showing filtration efficiency as a function of particle size, with the "most penetrating particle"
size having the lowest filtration efficiency. Breathing resistance is measured in millimeters. 1 - 5mm is level 2, 6 - 15mm is level 1, and more than 15mm is a fail. N95 masks test at 35mm. This is a failing grade range.
Bacterial Filtration Efficiency (BFE). Reporting is optional. The BFE score helps by showing effectiveness against slightly larger virus-carrying particles.
Electrostatic filter inserts can increase the BFE score to 90% or more. ASTM surgical masks need a BFE score of at least 95%. Woven fabric provides 'mechanical' protection from larger particles. Nonwoven filters provide 'electrostatic' protection from smaller particles.
ONE MORE THING... he manufacturer must conduct a "Fit Analysis" to make sure leakage is minimal and the mask sufficiently covers the wearer's nose & mouth. The F3502 standard offers best-in-class protection and breathability. That's why it's the only non-medical face covering standard recognized by the CDC. ASTM F3502. Raise your standards. Learn more and browse ASTM F3502-compliant masks at store.purakamasks.com.]
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