6 layer NanoScreen™ Mask. UMT engineered and hand-crafted its mask to block pathogens. Protect you and others around you ( see our ASTM test certification for bacteria and viral filtration efficiency). The key to the performance of our mask is the use of NanoScreen™filtration technology fabric. This fabric is used primarily in PPE masks to filter out viruses and bacteria.
Excellent breathability – rated 1.4 (see Nelson Lab Certificate).
Premium cotton inner layer that wicks moisture and prevents fogging. Smooth on your face.
NanoScreen™ Standard Grade VFE Viral Filtration Efficiency average = 90% ( see Nelson Lab Certificate )
NanoScreen™ Standard Grade BFE Bacterial Filtration Efficiency average = 89% (Test particle size = 3000 Nanometers = 3.0 Microns) // Also tested with Delta-P Breathability of 1.4
NanoScreen™ Standard Grade PFE Particle Filtration Efficiency average = 72% (Test particle size = 100 Nanometers = 0.1 Microns)
ASTM TEST REPORTS / KEY HIGHLIGHTS:
- BACTERIAL FILTRATION EFFICIENCY (BFE)
- Breathability is tested as outstanding at 1.4 in units of mm H2O/cm2. Breathability is becoming a major awareness issue in the mask market, due to negative health & wellness side effects of the highly restrictive N95 industrial masks.
-The breathability test is called the differential pressure test, or Delta P. This test is measured in the USA in units of mm H2O/cm2. The most rigorous ASTM standard requires that masks have a Delta P of less than 5.0, as a higher value would be considered too "hot" for general medical or surgical use.
- Masks with a Breathability / Delta P of less than 4.0 are considered acceptable for medical and surgical use and for personal choice wear.
- Masks with a Breathability / Delta P less than 2.0 would be considered very comfortable.
- The BMT NanoScreen™ Standard Grade was certified under the ASTM test with an excellent score of 1.4 which can be interpreted as extremely comfortable breathability performance for people on the move.
- BFE = Bacterial Filtration Efficiency / Highest score possible is 95% for medical and surgical wear, but this high level of filtration efficiency comes with very restrictive breathability which is why some masks are very restrictive.
- BMT NanoScreen™ Standard Grade Filtration efficiency = 89% making it a superior choice for a personal PPE protective mask solution
- The BFE test is conducted using Staphylococcus aureus as the challenge organism. After the filtration media is preconditioned, a liquid suspension of S. aureus is aerosolized and delivered to the filtration media at a constant flow rate of 28.3 liters per minute (LPM) or 1 cubic foot per minute (CFM). The aerosol droplets are drawn through a six-stage Andersen sampler for collection. The number of bacterial aerosol droplets contacting the filter media is determined by conducting challenge controls without filter medium in the test system. Challenge controls are maintained at 1700 – 3000 colony-forming units (CFU) with a mean particle size (MPS) of 3.0 ± 0.3 µm.
- PARTICLE FILTRATION EFFICIENCY (PFE)
- This PFE Test is noteworthy and very important because the PFE exam tests the filtration efficiency with the smallest test particle size of all of the ASTM tests.
- For the PFE, ASTM requires a test particle size of only 100 Nanometers, which is a very difficult test to score well on.
- By comparison, the BFE & VFE test is conducted using a much larger particle size of 3000 nanometers.
- As a reference point, remember that 1 nanometer (nm) = 1000 times smaller than a micron (μm) // 1 nanometer (nm) = 1 billionth of a meter
- On the ASTM PFE test, our NanoScreen™ Standard Grade product scored a 72% on that test which is an excellent score for such a fine test particle, and an important re-confirmation of our filtration efficiency.