GBPI GB-BFE – Mask Bacterial Filtration Efficiency (BFE) Tester

The GBPI GB-BFE is a specialized, bio-containment bacterial filtration efficiency tester engineered to evaluate the percentage retention of viable bacterial aerosols by medical face masks, surgical coverings, protective gowns, and sterile non-woven barrier materials. Designed in rigorous compliance with recognized international health standards including EN 14683 (medical face masks — requirements and test methods), ASTM F2101 (standard test method for evaluating the bacterial filtration efficiency of medical face mask materials), and YY 0469, this testing system delivers certified microbiological barrier validation.

During clinical procedures, healthcare professionals and surgical patients require dependable protection against liquid droplets and bio-aerosols expelled during coughing, sneezing, and speaking. The standard bacterial filtration test challenges the protective material with an aerosolized suspension of Staphylococcus aureus bacteria, demanding strict aerodynamic particle size distribution and zero leakage across the test rig. Operating as an advanced bacterial filtration efficiency tester, the GBPI GB-BFE houses a dual-line six-stage Andersen cascade impactor within a negative-pressure biosafety enclosure, ensuring complete operator safety and preventing laboratory environment bio-contamination.

Dual-Route Six-Stage Andersen Cascade Impactors

The system features two parallel six-stage viable particle Andersen impactors: Route A acts as the control sampling path to verify the positive bacterial challenge concentration (2200 ± 500 CFU), while Route B samples air transmitted through the clamped face mask specimen. Each impactor operates at a tightly calibrated flow rate of 28.3 L/min (1.0 CFM), classifying bacterial colonies across six aerodynamic cutoff stages ranging from >7.0 μm down to 0.65 μm onto standard agar Petri dishes.

Integrated Biosafety & HEPA Filtration

To safeguard operators from pathogenic bio-aerosols, the entire testing chamber operates under continuous negative pressure (-90 to -120 Pa) with an internal exhaust system discharging through a high-efficiency particulate air (HEPA) filter rated at ≥99.99% capture efficiency for 0.3 μm particles. An integrated germicidal UV lamp allows thorough chamber decontamination between testing runs.

Widely adopted by medical device certification institutes, non-woven textile manufacturers, and healthcare regulatory laboratories, the GB-BFE provides accurate, reproducible BFE data essential for surgical mask CE and FDA 510(k) clearances.