의료용 마스크는 표준화된 여과 테스트를 사용하여 평가됩니다: 박테리아 여과 효율(BFE)은 병원체 차단을 측정하고, 입자 여과 효율(PFE)은 에어로졸 포집을 측정하며, 델타 P는 통기성을 측정합니다. 부직포 층이 ASTM F2299 준수를 어떻게 달성하는지 알아보세요.
Face mask effectiveness depends on three interconnected performance metrics that balance protection with wearability. Healthcare facilities and purchasing managers must understand these standards to select appropriate masks for different clinical environments.
Bacterial Filtration Efficiency (BFE) Testing
BFE measures a mask's ability to prevent passage of bacteria-sized particles (0.3–10 micrometers). ASTM F2101 testing uses aerosolized Staphylococcus aureus at 3.0 L/minute. Surgical masks must achieve minimum 95% BFE. The meltblown nonwoven layer in mask construction provides this microbial barrier through electrostatic attraction and mechanical interception. BFE testing confirms the mask protects surrounding individuals (source control).ol).
Particle Filtration Efficiency (PFE) Testing
PFE measures inhalation protection by testing penetration of 0.1-micrometer latex particles per ASTM F2299. Surgical masks typically achieve 60–80% PFE depending on fit and seal quality. Respirator-grade masks (N95, FFP2, KN95) must exceed 94–99% PFE because the tight-fitting design and higher-efficiency filter media create superior barrier performance. PFE testing confirms wearer protection in high-risk environments.
Delta P (ΔP) Airflow Resistance
Delta P measures breathing resistance in millimeters of water column (mmH₂O). Surgical masks typically measure 2–4 mmH₂O at 28.3 L/minute airflow (simulating normal respiration). Masks exceeding 5 mmH₂O become uncomfortable and may encourage improper fit or removal. Manufacturers balance filter media density with breathability by selecting appropriate nonwoven blend compositions and meltblown layer specifications.
Nonwoven Layer Configuration for Compliance
Three-layer mask construction ensures compliance: outer spunbond layer repels fluids, middle meltblown layer (density 10–30 gsm) provides electrostatic filtration, and inner spunbond layer ensures comfort. Meltblown polypropylene fibers (2–5 micrometers diameter) trap particles through electrostatic attraction—higher meltblown GSM improves BFE but increases ΔP. Manufacturers optimize formulation to meet all three standards simultaneously.