Filter Test Reports | Totobobo Mask

Independent Lab Testing

Filter Test Reports

Every Totobobo filter is independently tested so the numbers behind our masks can be checked, not just claimed. The reports below were produced by Nelson Labs in the United States — one of the world’s leading testing facilities for filtration media.

Each filter grade is measured for particulate, bacterial, and viral filtration efficiency, with the full PDF report linked for every test. The PRO99 filter was separately certified to N99 level in China.

How to read these reports

MPS
Mean Particle Size
PFE
Particulate Filtration Efficiency
BFE
Bacterial Filtration Efficiency
VFE
Viral Filtration Efficiency

Nelson Labs, USA Independent

Test results from Nelson Labs, USA.

F96 Filter Highest-efficiency grade
TestParticle sizeConditionsEfficiencyReport
PFE 0.1 μm Latex particle challenge 99.86% PDF F96-PFE
BFE 2.9 μm ΔP 11.4 Pa/cm² · 8 L/min 99.9%* PDF F96-BFE
VFE 2.9 μm Viral challenge 99.9%* PDF F96-VFE
F94 Filter High-efficiency grade
TestParticle sizeConditionsEfficiencyReport
PFE 0.1 μm Latex particle challenge 99.71% PDF F94-PFE
BFE 2.9 μm ΔP 11.4 Pa/cm² · 8 L/min 99.9%* PDF F94-BFE
VFE 2.9 μm Viral challenge 99.9%* PDF F94-VFE
F92 Filter Everyday-efficiency grade
TestParticle sizeConditionsEfficiencyReport
PFE 0.1 μm Latex particle challenge 99.6% PDF F92-PFE

PRO99 Filter N99 Rated

Certified by the National Labor Protect Utensils Quality Supervision and Inspection Center (Beijing).

PRO99 Filter Rated N99 level
N99 certification National Labor Protect Utensils Quality Supervision & Inspection Center, Beijing PDF F99

* Figures marked with an asterisk are reported by the laboratory as 99.9% or greater.

See all our peer-reviewed studies.