Most mask purchase orders say Level 3 because it is the biggest number, and most of those masks end up on staff doing work a Level 1 covers. Plenty of boxes on clinic shelves also carry a level graphic with no test report behind it. ASTM F2100 mask levels rate the mask material, not the protection a wearer gets. Knowing what each level buys is how you stop overpaying on one end and under-specifying on the other.
What ASTM F2100 mask levels measure
ASTM F2100, Standard Specification for Medical Face Masks, is the U.S. rating for single-use medical mask materials, and the current edition is F2100-26. It covers masks with ties and with ear loops, so surgical and procedure masks face the same five tests: bacterial filtration efficiency (BFE), sub-micron particulate filtration efficiency (PFE), differential pressure (breathability), resistance to penetration by synthetic blood (fluid resistance), and flame spread. Results are grouped into three barrier levels.
| Requirement | Level 1 | Level 2 | Level 3 |
|---|---|---|---|
| Synthetic blood resistance (ASTM F1862) | 80 mm Hg | 120 mm Hg | 160 mm Hg |
| Bacterial filtration efficiency (ASTM F2101) | 95 percent or higher | 98 percent or higher | 98 percent or higher |
| Particulate filtration efficiency at 0.1 micron (ASTM F2299) | 95 percent or higher | 98 percent or higher | 98 percent or higher |
| Differential pressure (breathability) | Under 5.0 mm H2O/cm2 | Under 6.0 mm H2O/cm2 | Under 6.0 mm H2O/cm2 |
| Flame spread (16 CFR 1610) | Class 1 | Class 1 | Class 1 |
Three lines in that table decide the buy.
Fluid resistance is the only line that changes at every level. The synthetic blood test fires a fixed volume at the mask at 80, 120, or 160 mm Hg. That pressure step is the entire difference between Level 2 and Level 3.
Filtration is identical at Level 2 and Level 3. Both require 98 percent BFE and PFE. Level 1 requires 95 percent. If you are buying Level 3 over Level 2 for better filtration, you are paying for fluid resistance, not filtration.
Breathability runs the other direction. Level 1 masks must post a lower pressure drop than Level 2 and 3 masks. More barrier means more breathing resistance. One caution: older manufacturer literature quotes limits of 4.0 and 5.0 mm H2O from a prior edition, while current data sheets should cite 5.0 and 6.0. If they do not match, ask which edition the mask was tested to.
Procedure mask, surgical mask, N95: three different products
In supplier catalogs, a surgical mask usually means ties and a procedure mask usually means ear loops. The ASTM level applies to either, because it rates the material, not the fit. FDA regulates surgical masks as Class II devices under 21 CFR 878.4040, product code FXX, and its 510(k) guidance expects fluid resistance, BFE, PFE, differential pressure, and flammability data. A mask sold with a fluid barrier claim should have a 510(k) number.
An N95 is a different product. FDA describes a surgical mask as loose-fitting, with edges not designed to seal around the nose and mouth, and an N95 respirator as designed for a very close facial fit with edges that form a seal. Standard N95s are NIOSH-approved; surgical N95s are regulated by both FDA and NIOSH and add fluid resistance. No ASTM level turns a loose-fitting mask into a respirator. Where the exposure is airborne, buy the respirator and fit test it. Our guide to the 3M 1860, 1804, 1870+ and 8210 covers the choices.
Manufacturer guidance follows the fluid test:
- Level 1: procedures and exams with a low risk of fluid exposure. Intake, exam rooms, front desk, general clinic traffic.
- Level 2: procedures with a low to moderate risk of fluid exposure.
- Level 3: procedures with a high risk of fluid exposure, where spray or irrigation is expected.
Halyard's literature states that level selection depends on the patient's precaution status, the procedure, and the anticipated splash, and is not a substitute for professional judgment. Your infection prevention lead sets the policy. The buyer's job is to make sure the mask on the shelf is the one the policy names.
Reading a box label and a certificate
Before approving a mask, check five things:
- The level graphic on the box. ASTM requires it on the primary packaging. No graphic, no rating.
- The edition on the data sheet. F2100 has been revised several times. The sheet should name the edition and show all five results, not just BFE.
- A third-party test report. A BFE of 99 percent by itself is a marketing number. Ask for the lab report with fluid resistance, PFE, and differential pressure on the same page.
- The 510(k) number for any mask sold as a surgical mask or with a fluid barrier claim.
- Lot number and expiration or manufacture date on the box, and a manufacturer name that matches the report.
Two red flags: "medical grade" with no level stated, and a Level 3 graphic on a mask whose data sheet only reports filtration.
Stocking mix for a clinic or dental office
Standardize on two levels, not three. A common split is Level 1 for exam rooms, reception, and non-procedural staff, and Level 3 for operatories and procedure rooms. A practice whose procedures sit in the moderate band can run Level 2 as its single mask and skip the split.
Set par by counting staff-days, not by guessing a case count. Multiply clinical staff per day by masks per person per day under your policy, then by working days per month, and add a four-week buffer on the higher-volume level. Procedure masks typically pack 50 per box, and cases run from 10 to 50 boxes depending on the manufacturer, so round par to a case multiple and put the higher-volume level on a standing monthly order.
Keep one approved alternate per level on file. Pandemic-era allocations stranded buyers who had one brand approved and no second. Approve it before you need it, data sheet filed next to the primary's.
What Keystone supplies
Keystone Supply Group stocks ASTM Level 1 to 3 procedure and surgical masks from Kingfa, Halyard, and AMD Medicom, plus surgical N95s from 3M, Moldex, and Makrite, in Edina, Minnesota or through a 490+ distributor network. Every quote lists manufacturer, item number, ASTM level, pack size, and lead time, with the manufacturer's data sheet on request. Same-day quotes during business hours and Net 30 for approved accounts.
Browse N95 respirators and face masks or send your mask list to the sales department for a quote.
Sources
- ASTM International, F2100 Standard Specification for Medical Face Masks: https://store.astm.org/standards/f2100
- FDA, N95 Respirators, Surgical Masks, Face Masks, and Barrier Face Coverings: https://www.fda.gov/medical-devices/personal-protective-equipment-infection-control/n95-respirators-surgical-masks-face-masks-and-barrier-face-coverings
- FDA, Surgical Masks, Premarket Notification 510(k) Submissions: https://www.fda.gov/regulatory-information/search-fda-guidance-documents/surgical-masks-premarket-notification-510k-submissions
- Medicom, Why Mask Quality Matters: https://medicom.com/blog/why-mask-quality-matters/
- Halyard, Is Your Surgical Mask Protecting You?: https://www.halyardhealth.com/articles/face-mask/is-your-surgical-mask-protecting-you
- TestexTextile, Face Mask of ASTM F2100 Level 1, Level 2 and Level 3: https://www.testextextile.com/face-mask-of-astm-f2100-level-people-who-wear-masks-should-know/
