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Since the start of the outbreak, people in China and in the rest of the world have rushed to their local pharmacies to get surgical masks. But there are different types of masks on the market, and not all of them are really effective against this virus. So, which masks actually offer protection?
There are two different types of masks: surgical masks and respirators.
A surgical mask is a disposable medical device that can be bought in pharmacy and that protects against infectious agents transmitted by “droplets.” These droplets can be droplets of saliva or secretions from the upper respiratory tract when the wearer exhales.
If worn by the caregiver, the surgical mask protects the patient and his or her environment (air, surfaces, equipment, surgical site).
If worn by a contagious patient, it prevents the patient from contaminating his or her surroundings and environment. These masks should not be worn for more than 3 to 8 hours, depending on use.
A surgical mask can also protect the wearer from the risk of splashes of biological fluids. In this case, the surgical mask must have a waterproof layer. It can also be equipped with a visor to protect the eyes.
But a surgical mask does not protect against “airborne” infectious agents so it will not prevent the wearer from being potentially contaminated by a virus such as the Coronavirus.
A respirator is personal protective equipment that prevents the wearer from inhaling aerosols (dust, smoke, mist) as well as vapors or gases (disinfectants, anesthetic gases) that are health hazards. Unavailable in pharmacy, it protects the wearer from airborne infectious agents i.e. against contamination by a virus such as coronavirus, SARS, H1N1, etc.
Respirators are divided into two categories: insulating and filtering. Filtering respirators consist of a facepiece and a filtering device. Sometimes the filter element is integrated into the facepiece. Depending on the type of filter, the mask will either be effective only against particles, only against certain gases and vapors, or against particles, gases and vapors.
Filtering respirators can sometimes also be equipped with an exhalation valve to improve user comfort. The valve prevents condensation inside the mask, misting on the glasses and helps the user breathe in and out easily.
It should be noted that respirators also protect those who wear them from inhaling “droplets” of infectious agents. Respirators can be disposable or reusable. In the second case, it is possible to replace the filter when it is full.
Each of these two types of masks is subject to different standards and regulations depending on the country or geographical area.
Surgical masks are tested in the direction of exhalation (from inside to outside). The tests take into account the efficiency of bacterial filtration. In Europe, they must comply with the European standard EN 14683, which has 3 levels of bacterial filtration efficiency (BFE1, BFE2, Type R).
Respirators are tested in the direction of inspiration (from outside to inside). The tests take into account the efficiency of the filter and leakage to the face. In Europe, they must meet the European standard EN 149: 2001 which has three classes of disposable particulate respirators (FFP1, FFP2 and FFP3).
FFP1 refers to the least filtering of the three masks with an aerosol filtration of at least 80% and leakage to the inside of maximum 22%. This mask is mainly used as a dust mask (home renovations and various types of work).
FFP2 masks have a minimum of 94% filtration percentage and maximum 8% leakage to the inside. They are mainly used in construction, agriculture, and by healthcare professionals against influenza viruses. They are currently used for protection against the coronavirus.
FFP3 masks are the most filtering mask of the FFPs. With a minimum filtration percentage of 99% and maximum 2% leakage to the inside, they protect against very fine particles such as asbestos.
A contagious patient should wear a surgical mask as soon as contagion is suspected. In Europe, for caregivers, it is necessary to wear a respirator of at least class FFP2 or FFP3 for maximum filtration of particles and aerosols when caring for a patient who is infected or suspected of being so.
Surgical masks are disposable medical devices that must be disposed of in the appropriate manner after use. Respirators (FFP / N, R or P) can be disposable or reusable. In the second case, it is possible to replace the filter when it is full.
The effective life of a surgical mask or a respirator is indicated by the manufacturer. It varies according to use. Generally speaking, it can range from three to eight hours depending on the concentration of the contaminant and a series of external factors such as air humidity, temperature, volume of air breathed in, etc. Wearing face shields over face masks can prolong mask life. Face shields can also be easily washed and disinfected.
For respirators equipped with gas filters, if the wearer begins to perceive the smell of gas, he or she must immediately leave the work area and replace the filter. Similarly in the case of dust filters, if the wearer begins to perceive an increase in inspiratory effort, he or she should leave the premises and replace the filter. These masks are mainly worn by people working in contact with chemicals or by firefighters.
The shortage of FFP2 and surgical masks has fueled an increase in patterns and tutorials for making protective masks. A new type of protective mask has recently appeared and has been approved by certification organization AFNOR. The “barrier mask” is meant to be worn by healthy people. AFNOR has produced a reference document with the requirements to be satisfied when making these new barrier masks. This AFNOR Spec–Barrier masks document can be downloaded online free of charge.
The requirements for barrier masks are less ambitious than those for FFP2 and surgical masks, which should be reserved for healthcare professionals and other people at risk of exposure. Barrier masks meet a set of criteria endorsed by 150 experts and are aimed at providing all healthy people with further protection, in addition to good hygiene practices and social distancing. Textile and plastics companies can use the document to mass-produce these masks. The document’s appendix includes a list of laboratories (list to be complemented by the AFNOR website) for companies wishing to test their prototypes before going ahead with mass production.
The document is also intended to offer guidance to all those with the necessary materials and craftsmanship to make masks by themselves. It contains a number of diagrams, as well as ready-to-use patterns.
This article, written by Celia Sampol, originally appeared at http://emag.medicalexpo.com/which-masks-actually-protect-against-coronavirus/