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Lab Tests

Face Mask Test Results - Nelson Labs - KandyMask


We have been researching filtration for face masks and air purifiers since 2008. We have learned how to develop great filtration products over the years. Being open and transparent about testing and performance is at the core of what we do.

We know how important it is for you to buy a face mask that offers absolute respiratory protection. In our world, performance needs to be backed by data and not fancy marketing jargon. 

Nelson Labs performed these tests and is the world leader in microbiological and analytical laboratory tests. They also perform the pre-qualification testing for NIOSH, which certifies N95 masks. They are the gold standard when it comes to medical and pharmaceutical testing. Below is a summary of our face mask filter test results.

(1) Viral Filtration Efficiency (VFE): 99.80%  (see test report

(1) Bacterial Filtration Efficiency (BFE): 99.76%  (see test report

(1) Sodium Chloride Particle Efficiency  @ 0.07 to 0.3 micron: 97.14%  (see test report)

KandyMask - Summary of Face Mask Filter Test Results

99.80% Viral Filtration Efficiency

This test is to determine how well a face mask filters virus-containing droplets. A suspension of the bacteriophage ΦX174 was aerosolized using a nebulizer and delivered into KandyMask to perform the evaluation. The entire surface of our face mask was used to determine the final result.

For example, if masks score a Viral Filtration Efficiency (VFE) score of 95%. It will block 95% of droplets that contain viruses.

The higher the percentage, the better a mask is at blocking virus-containing droplets.


99.76% Bacteria Filtration Efficiency

This test is to determine how well a face mask filters bacteria-containing droplets. A suspension of Staphylococcus aureus was aerosolized using a nebulizer and delivered into KandyMask to select the final result. The entire surface of our face mask was used to evaluate the effectiveness of the face mask filter.

The same concept applies to the Viral Filtration Efficiency Test. The higher the Bacterial Filtration Efficiency (BFE) score, the better the barrier against droplets that carry bacteria.

97.14% Particle Filtration Efficiency

This test is primarily used by medical face masks seeking the N95 status. The N95 rate only applies to disposable medical masks and not reusable ones. There is no better test than to see if you would qualify as an N95 respirator.

This test is performed to determine the particle penetration rate of the filters. Sodium Chloride (NaCI) is generated and pushed through the entirety of the face mask. Sodium Chloride is basically microscopic particles of salt. This allows scientists to replicate different size particles you would find in air pollution.

The Nelson Lab scientist used particle sizes between 0.075 microns and 0.3 microns. The mass medium size was around 0.26 microns. This size is chosen because it is the most penetrating and challenging size for a face mask filter to catch. This is why N95 masks are required to subject themselves to this test and not another type of test for large particle size.


Important Note: KandyMask is not a medical mask but designed to be presented as the top-rated filtered mask for public use.  Our face masks with filters are designed to conform to N95 NIOSH particle and bacterial standards for ASTM F2100.  NIOSH doesn't certify masks like KandyMask for the general public as it focuses on medical devices.   Wearing KandyMask or any mask doesn't guarantee protection against disease.  It should be used as one of the tools to protect yourself in addition to social distancing and proper hygiene. We strive to make every effort to be the best consumer-facing, filtered mask on the market.