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N95 mask Certification

N95 Mask Certification Guide: NIOSH and FDA

Since COVID-19, many companies and the populace are concerned about N95 masks, and this article talks to you about the N95 mask certification. First, let’s take a look at the U.S. regulatory body for masks (respirators).

In simple terms, NIOSH is responsible for the certification of personal protective respirator N95, FDA is responsible for the registration audit of medical masks, and medical N95 mask certification by two agencies.


NIOSH Certification Authority

N95 is called Respirator in English, now it is called N95 mask in COVID-19, which is actually very different from ordinary masks.


The National Institute for Occupational Safety and Health (NIOSH) and the National Personal Protective Technology Laboratory (NPPTL) are the agencies specifically responsible for respirator product certification.


NRP Series

According to the US Federal Code 42 CFR part 84, NIOSH classifies anti-particle masks into 3 series of 9 categories.


Classification N series R series P series
Features Only filter non-oily particles. Filters both oily and non-oily particulate matter, but cannot filter oily particulate matter for more than 8 hours. Filters both oily and non-oily particulate matter.
Filtration efficiency ≥ 95% N95 R95 P95
Filtration efficiency ≥ 99% N99 R99 P99
Filtration efficiency ≥ 99.97% N100 R100 P100

“N95” means 95% filtration efficiency under the testing conditions specified in the NIOSH standard, N95 is not a specific product name and “N” does not stand for “N” in NIOSH. As long as the product meets the N95 standard and passes the NIOSH review, it can be called an “N95 mask”.

The CDC released a list of falsely certified masks to alert users, purchasers, and manufacturers of the following main scenarios.

  • No markings: The mask or package is not clearly marked with the NIOSH approval number (TC).
  • NIOSH is misspelled (e.g. NISH, NOISH)
  • Other decorative accessories on the mask
  • Claimed children’s N95 masks (NIOSH does not approve any children’s masks)
  • Earloop masks instead of headgear (currently NIOSH are headgear masks)

The following are some N95 masks that are counterfeit or non-approved by NIOSH.

There is no NIOSH logo on the mask and no approval number.
intentional misspelling, NISH


Certification Process

For producers applying for N95 for the first time, the application is divided into two stages.

1 Submit a questionnaire and photos (factory appearance, product line, etc.) to NPPTL for evaluation. After passing the evaluation, NPPTL will give the manufacturer a Three-character Manufacturer’s Code and other related information.

2 After receiving the documents from NPPTL, prepare the detailed application documents. In addition to filling out the standard forms, the company also need to provide the following information to meet the standard requirements.

After passing the certification, NIOSH will give the applicant a TC (Testing and Certification Number) and an approval mark.

Generally speaking, the average time for NIOSH certification is 94.8 days, with a minimum of 22 days and a maximum of 189 days.


After a manufacturer obtains N95 certification, NIOSH will conduct annual spot checks on certified products marketed by the manufacturer to determine whether the company consistently meets the requirements of N95.

The official website of the CDC lists the manufacturers of N95

NIOSH-approved respirators have an approval label on the package or inside the package. The certification number can be verified on the NIOSH Certified Equipment List (CEL) or NIOSH Trusted-Source to determine if the respirator has been approved by NIOSH.

The CDC website gives an identification for filtered respirators as follows.


Medical N95 mask/respirator

The U.S. Federal Code 21 CFR part 860, according to the different risk levels, the FDA classifies medical devices into three categories with different regulatory approaches.

Class Ⅰ Class Ⅱ Class Ⅲ
Lower risk levels,

including toothbrush, dental floss, first aid bandages, etc.

Medium risk,

Including isolation clothing, medical masks, etc.

Highest risk level,

including artificial heart, etc.

General controls Special controls Premarket approval

The FDA classifies more than 1,700 different types of devices into 16 medical specialty groups. To determine the classification of devices, follow the 16 medical specialty groups to find the corresponding classification of devices.

Careful comparison of device names reveals that there are a total of seven related product codes, namely: FXX, OXZ, OUK, MSH, ONT, NZJ and ORW, all belonging to Class II medical devices. MSH refers to surgical respirators and specifically refers to medical N95 masks. The specific classification information is summarized in the following table for your reference.

PC Device Regulation number Type Submission
FXX Mask, Surgical 878.4040 510 (K)
OXZ Pediatric/Child Facemask 878.4040 510 (K)
OUK Surgical Mask with Antimicrobial/Antiviral Agent 878.4040 510 (K)
MSH Respirator, Surgical 878.4040 510 (K)


ONT N95 Respirator with Antimicrobial/Antiviral Agent 878.4040 510 (K)
NZJ Respirator, N95, for use by the general public in public health medical emergencies 880.6260 510 (K)
ORW N95 respirator with antimicrobial/antiviral agent for use by the general public in public health medical emergencies 880.6260 510 (K)

Note: If the intended use of the N95 mask is to prevent a specific disease or infection, to filter viruses or bacteria, or to reduce/kill microorganisms, it is not covered by the exemption.



In May 2018, the FDA issued a new rule exempting the vast majority of 510(k) applications for N95 masks. This move was made to streamline the N95 approval process for N95 masks only. For other surgical masks, a 510(k) application is still required.


Medical N95 masks

For medical N95 masks, in November 2017, the FDA and CDC/NIOSH signed a memorandum of understanding (MOU) that established a flow chart for the evaluation of N95 masks.

The N95 mask manufacturer first applies to NIOSH, which evaluates whether it is within the scope of the certification, and if it is outside the scope of the certification, it is forwarded to the FDA for evaluation. The FDA also reviews other aspects of product performance, it includes but is not limited to: bacterial/viral filtration efficiency, other biocompatibility assessments such as gas pathway safety assessments, toxicology, etc.

Simply put, a medical N95 mask is a compound.

You can check the official website of the FDA to obtain information on manufacturers qualified to produce N95 masks.

The U.S. CDC lists the characteristics of three types of masks

Medical-surgical masks N95 masks Medical N95 masks



Reviewed by FDA, based on the ASTM F2100 standard, requires certain filtration efficiency, breathing resistance, water resistance, and flammability. Must meet NIOSH requirements for minimum filtration efficiency and breathing resistance, evaluated, tested, and certified by NIOSH. By NIOSH for filtration efficiency and breathing resistance, by FDA for water resistance and flammability of the mask.


Prevents the release of potential contaminants from the user into the environment and also protects the wearer from large droplets, sprays, and splashes of body fluids. For blocking liquid splashes, droplets, and spitting. Special occupational use to reduce the wearer’s exposure to small particle aerosols and large liquid droplets for any occupational environment requiring N95 protection. For blocking airborne particulate matter from aerosols and viruses. Used in the medical industry where sterile areas need to be maintained, to reduce the wearer’s exposure to certain airborne particles, sickness-blocking splashes, and sprays. For blocking airborne particles, droplets and sprays blocks aerosols and viruses.

A mask that meets both NIOSH and FDA standards is the medical N95 mask. This type of mask has two functions, it can prevent droplet transmission and airborne diseases, and it can block blood and body fluid spurts that may occur during surgery.


Medical N95 mask marking

  1. NIOSH-approved manufacturer’s name or registered trademark.
  2. Capitalized NIOSH letters.
  3. NIOSH testing and certification number, e.g. TC-84-XXXX
  4. NIOSH filtration characteristics and filtration efficiency rating
  5. Mask type
  6. Batch No: LOT
  7. SURGICAL MASK logo for use in the operating room

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