When a distributor puts “PFE ≥ 99%” in 28-point kind on a quotation, the number looks precise, clinical, and conveniently equivalent, despite the fact that the underlying report may explain a various aerosol, bit size, circulation rate, mask construction, test area, or manufacturing whole lot than the item really being offered.
So what, exactly, are we contrasting?
My policy is candid: a filtering percentage without its examination conditions is sales copy, not procurement proof. The PFE examination can be useful– extremely valuable– yet just after we recognize what was tested, just how severely it was challenged, which specimens were examined, and whether those samplings match the delivery under arrangement.
The PFE Percent Is Only the Last Line of the Experiment
Fragment filtration performance defines the percentage of obstacle bits stopped by mask material under defined laboratory conditions. In its easiest form:
PFE (%) = [1 − (downstream particle concentration ÷ upstream fragment focus)] × 100
A 99% outcome as a result implies that 1% of the gauged difficulty passed through the specimen throughout that test. It does not imply 99% security versus infection. It does not determine leak around the cheeks or nose. And it does not convert a loose-fitting medical mask into a respirator.
That difference is not scholastic. The FDA’s recognized range for ASTM F2100-23 says medical-mask material efficiency is categorized using bacterial purification efficiency, differential pressure, sub-micron PFE, synthetic-blood infiltration, and flammability. It additionally states the requirements does not review every element of mask layout or total barrier efficiency. The FDA’s ASTM F2100-23 recognition document is abnormally ordinary about that limit.
The tough truth? Customers regularly ask a material test to answer an in shape question. It can not.
Determine the Product Course Before You Compare Clinical Mask Distributors
“Mask” is not a technological category. It is a buying word that can hide 3 products with different desired uses, regulatory courses, and efficiency insurance claims.
| Product offered | Main U.S. recommendation | What filtration data can support | What it does not confirm |
|---|---|---|---|
| Clinical or surgical mask | ASTM F2100; 21 CFR 878.4040 | Efficiency of the checked medical-mask building under mentioned research laboratory conditions | A limited face seal or N95-level wearer protection |
| N95 filtering facepiece respirator | NIOSH 42 CFR Part 84 | At least 95% filtration under the appropriate NIOSH authorization examination, tied to an approved arrangement | That every in a similar way formed “KN95” or “medical” mask is equal |
| Obstacle face covering | ASTM F3502 | Mentioned filtering, airflow resistance, and leakage-related efficiency under that spec | Surgical-mask fluid-barrier condition or NIOSH authorization |
The FDA’s mask and respirator contrast makes the separating line clear: surgical masks are baggy tools, while N95 respirators are created for a close face fit.
If a distributor utilizes an ASTM Level 3 PFE result to suggest N95 equivalence, quit the comparison. The case has actually changed classifications mid-sentence.
PFE Examination Methods Are Not Numerically Compatible
Two records can both say “PFE” and still explain different experiments. Older ASTM F2100 reports frequently recommendation ASTM F2299/F2299M, utilizing polystyrene latex balls– PSL– under specified problems. The changed structure uses a salt chloride aerosol, NaCl, with the F3502 method referenced for sub-micron filtration.
Tiny details bite.
Charged, non-neutralized fragments can be less complicated for an electrostatic meltblown polypropylene filter to record. A higher face rate can make the obstacle a lot more serious. A 0.1 μm small bit and a polydisperse NaCl aerosol around the most penetrating particle-size area do not create numbers that must be contrasted by reduction.
This is where lazy bid tables fall short. Supplier A reports 98% under an older PSL method; Vendor B records 86% under a newer NaCl method; purchasing ranks An initial.
That verdict may be backwards– or just unknowable– until the methods are normalized.
| Record area | What I wish to see | Purchase warning |
|---|---|---|
| Standard and version | Precise classification, such as ASTM F2100-23 and the referenced PFE method | “Examined to ASTM criteria” |
| Difficulty aerosol | NaCl or PSL, including charge-neutralization status | “0.1 micron examination” with no aerosol chemistry |
| Bit circulation | Count mean diameter, geometric common discrepancy, or exact technique reference | A solitary particle-size claim separated from the approach |
| Circulation seriousness | Volumetric circulation plus revealed location, or determined face rate in cm/s | Circulation rate reported without examination area |
| Specimen | Completed mask, reduced material, positioning, and variety of layers | A swatch outcome utilized to market another mask style |
| Conditioning | Temperature level, relative moisture, preconditioning, and filling state | No conditioning declaration |
| Testing | Individual outcomes, sample matter, great deal numbers, and dates | One standard without any raw results |
| Lab | Legal name, accreditation extent, report number, and accredited signatory | Logo-only certificate or chopped screenshot |
No approach, no definition.
ASTM F2100-23 Reset the Standard
FDA Recognition Listing 060 documents ASTM F2100-23 with an entry day of May 29, 2023. The revision issues because purchasers might now get tradition F2299 records beside more recent NaCl-method records, each bring a very different-looking medical mask PFE rating.
Under the current NaCl strategy displayed in an FDA 510(k) summary utilizing ASTM F3502-24, PFE acceptance standards go to the very least 80% for Degree 1 and at the very least 85% for Levels 2 and 3.
Older latex-sphere reports frequently reveal 95% for Level 1 and 98% for Levels 2 and 3. Those lower current limits do not, on their own, signal a weak mask; they mirror a different and much more controlled obstacle approach. The comparison should be method-to-method, not number-to-number.
And discover what did not go away: BFE stays at least 95% for Degree 1 and 98% for Degrees 2 and 3, while fluid resistance divides the levels at 80, 120, and 160 mmHg.
A provider who falls down that matrix right into “Degree 3 equates to 98% PFE” may be quoting an older structure– or may not recognize the report being sold.
The 2023– 2024 Situation Files Program Why Whole Lot and Variant Identification Issue
The first instance is uneasy due to the fact that the brand name was established.
On August 9, 2023, O&M Halyard launched a voluntary recall of FLUIDSHIELD Surgical N95 Respirator Mask, Orange, Small, Level 3, Design 46827, Great Deal AM2164811, after that great deal fell short particle filtration screening. The FDA’s September 29, 2023 security communication did not condemn every Halyard mask; it apart useful models, versions improper for fluid-barrier applications, terminated products, and the recalled great deal.
That is the lesson. Brand-level authorization is unrefined. Model-level approval is better. Lot-level proof is where significant purchase starts.
The second situation strikes a different faster way: presuming a gotten rid of base model confirms every color, logo, and size.
In a June 27, 2024 warning letter to Baylab U.S.A., the FDA explained a January 24– 31 examination and stated particular ASTM Level 1, Degree 3, and KN95 products were faulty or misbranded. The company noted advertising and marketing insurance claims of at the very least 95% particulate or bacterial purification and 80 mmHg fluid resistance, while likewise determining shades, published logos, and pediatric versions outside the assessed configuration.
Ink is not decoration when it alters a clinical gadget.
Colorants can change chemistry; pediatric sizing adjustments fit; a new meltblown provider can modify filtration; and a new ultrasonic-weld pattern can change leakage courses via the building. “Same mask, brand-new color” is a business expression. It is not a validation method.
Contrast Difference, Not the Supplier’s Best Example
The very best medical mask suppliers are not the firms with the highest separated result. They are the firms that can show narrow dispersion throughout several samples, nonconsecutive great deals, and the specific bill of materials they mean to deliver.
Take into consideration a hypothetical bid. Distributor An evaluates ten samplings from each of 3 nonconsecutive whole lots; the 30 outcomes range from 86.8% to 89.4% under the same NaCl approach. Distributor B presents one specimen at 99.2%, no great deal code, and a report issued 22 months prior to the estimated manufacturing date.
Supplier B has the larger number. Distributor An owns the stronger evidence.
I would certainly also ask for the minimal result, not just the expected value. If 5 masks score 99.1%, 98.9%, 98.7%, 97.8%, and 82.0%, the standard is 95.3%. That brightened ordinary hides one sampling 13.3 portion points below it.
For a pass-or-fail spec, the tail matters more than the heading.
A previous FDA 510(k) evaluation memorandum requested for performance screening from three nonconsecutive lots and sample sizing linked to a 4% appropriate top quality limitation, or a scientific justification for one more strategy. That record is not a global investing in regulation. It is, nonetheless, a beneficial window right into regulative skepticism towards single-lot proof.
Utilize a Weighted Vendor Scorecard, After That Write the Outcome Into the PO
Rate deserves a seat, not the throne.
A one-cent saving throughout five million masks is $50,000; that is genuine money, however a declined delivery, emergency replacement order, or product hold can consume it swiftly.
Below is the weighting I utilize as a beginning position:
| Choice area | Weight | Evidence required |
|---|---|---|
| Test-method suit and technical compliance | 30% | Complete records for PFE, BFE, ΔP, synthetic blood, and flammability as applicable |
| Great deal uniformity and adjustment control | 25% | Raw results across nonconsecutive lots; bill-of-material and process controls |
| Regulative identification | 20% | Supplier identity, tool listing or clearance proof as relevant, UDI, specific model and planned usage |
| Quality-system execution | 15% | CAPA background, inbound controls, traceability, grievance and recall treatment |
| Commercial performance | 10% | System price, lead time, ability, repayment terms, and delivery document |
Then transform the winning file right into enforceable purchase-order language: called factory; called model; accepted bill of materials; typical version; minimum individual PFE; required example plan; laboratory qualification; no subcontracting without written authorization; pre-shipment lot report; right to independent retest; and a rejection solution.
Otherwise, the sample wins the business and a transformed manufacturing run fills the container. I have a low viewpoint of “golden samples” for precisely this reason.
BFE vs PFE: Associated Numbers, Various Inquiries
Microbial purification efficiency difficulties mask material with an aerosol having Staphylococcus aureus and reports how much microbial obstacle is stopped. PFE utilizes non-biological fragments and focuses on sub-micron purification under its named method.
BFE vs PFE is not a contest in which the higher number wins; each steps a various reaction.
The FDA-recognized range for ASTM F2101-23 states that the BFE method can evaluate up to 99.9% and does not evaluate fit or facial sealing. That ought to finish a typical sales maneuver: providing 99.9% BFE as proof of 99.9% user security.
And VFE? Viral filtration performance might show up on provider literature, but it is not a replacement for the called for ASTM F2100 examination matrix. Ask where the case sits in the relevant standard, regulative entry, and purchase spec.
If the response is “our pamphlet,” we are done.
Apply the Exact Same Proof Discipline Throughout a Bigger PPE Program
Category breadth does not verify medical-mask competence.
A vendor might properly provide disposable PE/CPE rainfall coats for mass sourcing, wholesale PE/CPE pullover rain ponchos, custom-made PVC hooded rainfall ponchos, and PE/CPE hooded non reusable raincoats alongside masks.
Penalty.
However each group needs its own product spec, intended-use declaration, examination strategy, change-control policies, and whole lot documents; a wide catalog is not a shared certification of competence.
Concerns Procurement Teams Ask About PFE Test Results
What is an excellent PFE score for clinical masks?
A good PFE ranking is the minimal outcome called for by the specific conventional version and test approach named in the acquisition specification, sustained by lot-linked lab data; under the present ASTM F2100/F3502 NaCl technique, that normally implies at least 80% for Level 1 and 85% for Levels 2 and 3.
Do not compare those figures straight with 95% or 98% results created under an older latex-sphere method. Very first match the common edition, aerosol, circulation severity, specimen type, and reporting guideline. “Greater” is significant just inside the very same experiment.
What information should a vendor’s PFE test report have?
A supplier-ready PFE examination record is a lot-traceable research laboratory record that determines the mask version and building, conventional and version, aerosol chemistry, particle-size distribution, flow price or face velocity, test location, conditioning, sample count, individual results, recap statistics, approval standards, examination day, research laboratory identification, and permission.
The record number must be proven with the issuing research laboratory, and the tested design, shade, size, layer framework, factory, and great deal must match the quotation and delivery. Cropped certificates, undated screenshots, and reports released to an unassociated trading firm are entitled to a hold, not a disagreement.
Can BFE change PFE when contrasting providers?
No, BFE is a bacterial-aerosol product examination and can not change PFE, due to the fact that both approaches make use of various difficulty representatives, bit circulations, and endpoints; neither examination alone determines facial leak, user fit, liquid resistance, breathing resistance, flammability, or the full security supplied by a baggy medical mask.
Call for both results when the relevant ASTM F2100 mask criteria require them. Then review differential pressure and synthetic-blood resistance close to filtering, since a high-filtering product that is difficult to breathe through– or a mask that fails liquid resistance– does not please the same use instance.
Exactly how should I contrast medical mask vendors making use of different records?
Medical mask vendors should be contrasted only after their reports are normalized by item class, design, costs of materials, common edition, PFE technique, aerosol, particle dimension, circulation or face velocity, examination location, conditioning, sample matter, lot matter, and reporting figure, with unmatched fields treated as unsolved threat as opposed to equivalent efficiency.
Produce a bid-normalization sheet with one column for every single field. Do not “adjust” unlike percents making use of a created conversion aspect. Ask distributors to retest the estimated item at the very same certified lab under the exact same technique; if one declines, that rejection is decision information.
Demand the Dossier Before You Honor the Order
Do not buy “99%.” Buy a specified product, made in a called factory from a controlled expense of products, tested under a called method, throughout traceable great deals, with acceptance guidelines written right into the purchase order.
Send distributors the very same proof list. Need raw sampling results. Reserve independent retesting. And make unapproved modifications to meltblown media, colorants, measurements, welds, ear loops, nose cord, factory, or subcontractor grounds for denial.
That is just how to translate PFE examination results without allowing the cleanest percentage hide the dirtiest unpredictability. If a distributor can not link its number to your exact delivery, contrast an additional supplier.
