ASTM F2100 grades medical face masks in North America into Level 1, Level 2 and Level 3 using five measured tests, not fabric weight or packaging. Every level must filter at least 95% of bacteria, Level 2 and Level 3 raise that to 98% for both bacteria and 0.1-micron particles, and synthetic blood resistance is the only measure that separates Level 2 (120 mmHg) from Level 3 (160 mmHg). AAMI PB70 — the standard behind the phrase "AAMI Level 3" — is a barrier classification for gowns and drapes, not for masks, so an AAMI level printed on a mask has been borrowed from the wrong document.
Quick Facts
- Mask standard: ASTM F2100 grades masks as Level 1, 2 or 3.
- Five tests: BFE (ASTM F2101), PFE (ASTM F2299), differential pressure, flame spread (16 CFR 1610), synthetic blood (ASTM F1862).
- Filtration: 95% BFE and PFE at Level 1; 98% at Levels 2 and 3.
- Fluid: synthetic blood at 80, 120 and 160 mmHg.
- Not a mask standard: AAMI PB70 grades gowns and drapes, via AATCC 42 and AATCC 127.
The Five Tests Behind Every ASTM F2100 Level
A mask must clear all five tests at the threshold on the box.
- Bacterial filtration efficiency (BFE, ASTM F2101). The mask is challenged with bacteria-sized droplets and the percentage held back is measured — the test that matters most for routine care.
- Particle filtration efficiency (PFE, ASTM F2299). The challenge particle is 0.1 micron, the hardest size for a non-woven filter to capture.
- Differential pressure (ΔP). Resistance to airflow in mm H₂O/cm². Lower is more breathable, and this figure decides whether staff keep a mask on for a shift.
- Flame spread (16 CFR Part 1610). Every level must reach Class 1: the material does not keep burning once the ignition source is removed.
- Synthetic blood penetration (ASTM F1862). The only test where the three levels diverge, and the reason Level 3 exists as a separate grade.
Why a Heavier Mask Is Not a Higher Level
Filtration comes from the charged meltblown layer between the inner and outer plies, not from loft or stiffness. Extra weight can raise ΔP without lifting BFE or PFE, producing a mask that feels substantial and filters like a lower level. The useful question is which level appears on the test report, measured against which revision of the standard.
Level 1, Level 2 and Level 3 Side by Side
Reading across a row shows what changes between levels; reading down a column shows the full profile a supplier should be able to document.
| Test | Level 1 | Level 2 | Level 3 |
|---|---|---|---|
| BFE (ASTM F2101, 3-micron droplets) | ≥ 95% | ≥ 98% | ≥ 98% |
| PFE (ASTM F2299, 0.1-micron particles) | ≥ 95% | ≥ 98% | ≥ 98% |
| Differential pressure (mm H₂O/cm²) | < 4.0 | < 5.0 | < 5.0 |
| Flame spread (16 CFR Part 1610) | Class 1 | Class 1 | Class 1 |
| Synthetic blood penetration (ASTM F1862) | 80 mmHg | 120 mmHg | 160 mmHg |
Two things follow. Levels 2 and 3 are identical on filtration, breathability and flame spread, so the whole difference between them is how much pressure a splash of blood carries before it passes through. Level 1 alone has a tighter breathability ceiling, which suits long, low-fluid sessions.
What "AAMI Level 3" Means on a Mask
Searches for AAMI levels almost always start from a label or listing that has collapsed two standards into one. AAMI PB70 is the barrier performance classification for protective apparel. It says nothing about face masks, and no mask can be graded to it. A supplier describing a mask as "AAMI Level 3" has borrowed the term from a gown line.
What AAMI PB70 Actually Grades
PB70 classes garments from Level 1 to Level 4 on water resistance. Level 1 needs AATCC 42 impact penetration at 4.5 g or less; Level 2 adds AATCC 127 hydrostatic pressure at 20 cm; Level 3 raises that to 50 cm; Level 4 adds ASTM F1671 for bloodborne pathogen penetration under continuous liquid contact. Each threshold describes a garment worn over the torso, not a filter over the nose and mouth. The gown side is worked through in our comparison of isolation gown standards under ASTM F2407 and AAMI PB70.
How to Read a Mask Label Correctly
A mask listing should name a standard, not just a level. The correct form is ASTM F2100 followed by the level, because an AAMI Level 3 gown and an ASTM F2100 Level 3 mask resist different hazards, in different units, on different body sites. When a listing shows only a bare number, ask for the test report: it states the BFE and PFE percentages, the ΔP figure, the flame class and the synthetic blood pressure in millimetres of mercury. Our own documents are collected on the CliniEco certifications page.
What a Code Like "111352014" Tells You
Digit strings such as 111352014 are catalogue numbers, part numbers or internal SKUs. They identify a product for ordering, not a performance level, and the same digits can mean different things at two distributors. Standards have a recognisable form: ASTM F2100 and ASTM F1862 for masks, ASTM F2407 and AAMI PB70 for gowns, and CSA Z314 for Canadian sterilization. A document showing only a numeric code has not answered the question — request the standard and the level tested to.
Matching the Level to the Procedure
Level selection follows the fluid risk of the task, not the weight of the box. Routine examinations, reception and non-clinical duties sit at Level 1, where splash load is low and breathability over a long shift matters more than strike-through resistance. Procedures with a realistic spray of blood or body fluid — dental work, minor suturing, phlebotomy, most laboratory benches — sit at Level 2. Level 3 is for higher-pressure splash events: arterial bleeding, prolonged irrigation, orthopaedic work. Most clinics stock two tiers, which is how our own range is positioned: the CliniEco Level 1 three-ply procedural mask for routine care and the CliniEco Level 3 three-ply mask, 50 pack for procedures where a splash at 160 mmHg has to be blocked.
Stocking Two Levels and Planning the Rest of the Order
Mask purchasing waste rarely comes from the wrong standard; it comes from buying one tier for everything.
Two Tiers, Two Par Levels
Set par levels per room, counted from the tasks performed there: a reception desk stretches a forty-mask box for weeks, while a procedure room clears it in days. Keep the tiers visually distinct in storage so nobody reads labels under time pressure. Clinics building the wider list can work from our point-of-care PPE checklist for gloves, gowns and masks, and the same volume logic is applied to gloves in the breakdown of monthly exam-room glove consumption for Canadian clinics. The CliniEco learning hub collects the remaining stocking guides, including the glove consumption assumptions and the ASTM F2407 and PB70 gown comparison.
Daily Monitoring Is the Ontario Baseline
The Royal College of Dental Surgeons of Ontario expects biological monitoring for every day a sterilizer is used and for each type of cycle a practice runs — a daily standard, not a weekly one. The weekly cadence that circulates online comes from the CDC guideline and AAMI ST79, which set at least weekly monitoring as a floor for a sterilizer that passes daily physical and chemical checks and carries no implant load. That US floor does not replace the Ontario daily requirement.
The Arithmetic That Makes the Order Predictable
A practice sterilizing five days a week and closing for about two weeks a year runs roughly 250 sterilization days, so clinics monitoring daily plan for around 250 biological indicators per sterilizer per year. Budgeting on the weekly figure produces 52 indicators and a mid-quarter shortage. CliniEco Medical holds Health Canada MDEL #35334, and the same discipline applies to the indicator side of the order.
Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers.
Related reading
Continue with isolation gown standards under ASTM F2407 and AAMI PB70, point-of-care PPE checklist for gloves, gowns and masks and monthly exam-room glove consumption for Canadian clinics.
Frequently Asked Questions
Is AAMI Level 3 the same as ASTM F2100 Level 3?
No. ASTM F2100 Level 3 is a mask grade: 98% or more BFE and PFE with synthetic blood resistance at 160 mmHg. AAMI Level 3 is a gown grade under AAMI PB70, based on AATCC 42 impact penetration and AATCC 127 hydrostatic pressure at 50 cm.
What separates a Level 2 mask from a Level 3 mask?
Only synthetic blood penetration under ASTM F1862. Both must reach 98% BFE and PFE, both must stay under 5.0 mm H₂O/cm² of differential pressure, and both must pass flame spread as Class 1. Level 2 is tested at 120 mmHg and Level 3 at 160 mmHg.
Can a face mask be certified to AAMI PB70?
No. PB70 classifies gowns, drapes and other protective apparel. A mask is graded under ASTM F2100, so a listing that calls a mask "AAMI Level 3" should be checked against a Standard F2100 test report.
Does a higher mask level make breathing harder?
Not by itself. Levels 2 and 3 share the same differential pressure ceiling of 5.0 mm H₂O/cm², while Level 1 is capped at 4.0 mm H₂O/cm². A well-made Level 3 mask can breathe more easily than a poorly built Level 1 mask.
This article is general information for Canadian clinic and medical supply planning, not clinical or regulatory advice. Mask level selection belongs with the infection prevention and control lead and each product's instructions for use. CliniEco Medical is a licensed medical device establishment (MDEL #35334).
Ready to split your mask stock by task? Stock the Level 1 procedural mask for routine wear and the Level 3 mask, 50 pack for the procedure room. → Start with a trial: CliniEco 24h Biological Indicator — 5-Pack Trial, a $12.99 start (shipping included) for clinics that also monitor an on-site sterilizer.
0 commentaire