Safety masks are developed to preserve the face and eyes, divided into two general full and half face masks.
Two important factors that signify the specifications are the requirements for a mask, the potentially harmful gas in the atmosphere, and the time of presence in the working space.
Being related to breathing safety, masks should be chosen with high care and delicacy, as we are aware that inhaling toxic gas can lead to irreparable consequences. 
Generally, industrial working spaces require the use of safety masks, dust, pollution, and chemical toxic gases, that are harmful to breathe and workers should take safety measures into account by using proper masks.
One of the occupations that obligates the workers to wear safety masks is mining, the atmosphere of the mine requires the workers to use this safety equipment.
Laboratories may endanger health by breathing toxic and contaminated chemical gas.
Safety Masks should be flame resistant and heat-radiation resistant.
The mask does not melt or catch fire when tested accordingly to the EN 136 standard.
As we know some of the working spaces are of a high-temperature degree.
Surgical Mask
Surgical masks are specially built to preserve the entrance of dust, contaminations, and infections.
These types of masks can be effective in preventing and spreading the coronavirus.
A surgical mask is one of the best options to prevent bacteria and contaminants from entering the lungs and causing respiratory diseases.
One of the most important features of the three-layer surgical mask is its hygiene and high quality.
These masks are disposable and not washable, so be sure to throw them away after use with hygiene tips.
These masks have all of the industrial ultrasonic stitching, and the sewing of this type of mask is done without using hands.
Also, in this type of mask, special surgical straps (four straps) are used, which are tied behind the head, and the person can easily put the mask on the face as desired.
Three-layer surgical masks consist of three layers, which are two outer layers of span fabric and the inner layer of Melt, which acts as a filter and is impermeable insulation against viruses.
It also prevents the spread and transfer of these pollutants. The separate panels in this mask are connected by a press.
One of the most important features of these fabrics is that they are soft and gentle and that they are very easy to breathe and airflow is easily transferred.
This type of mask is designed in such a way that it covers from the nose to the chin appropriately and prevents the entry of pollutants into a person's lungs.
FFP2 Mask
This type of mask is the second degree of mask considered in this standard.
FFP2 masks are up to 94% resistant to particles such as a virus. These masks are similar to the American standard N95.
Harmful types of dust, smoke, and solid and liquid aerosols that may be made of fibers stimulate the respiratory system in a short sequence of time and can lead to a decrease in the lung over longer periods.
FFP2 medical masks are used for working spaces where the particles are annoying and spread in the air.
FFP2 protective medical-grade masks are often used in the metal and mining industries where workers are frequently exposed to aerosols, fog, and smoke.
These substances damage their respiratory system, exposing them to lung cancer and other breathing problems.
If we want to work at the same time in an environment where there are both dust particles and gas particles and vapors, we must use this type of mask.
Nasal and face masks are not respiratory safety equipment, but they are a type of safety mask.
One of these masks is designed to protect the nose and the other is designed to protect the entire face.
These protective masks protect the facial components from physical blows and pressure.
N95 Mask
In general, in the face of any disease that is likely to be contracted through breathing air close to the infected person.
It is also essential to use the N95 mask when performing aerosol-producing movements (such as suction and intubation) on any patient who is likely to develop the disease through breathing.
Most breathing N95 masks are designed for use in construction and other industrial occupations.
These job opportunities expose workers to dust and harmful particles to the lungs.
N95 masks are used in a healthcare setting.
In particular, disposable breathing masks are used by health care personnel during hospitalization and treatment of different diseases.
patients and members of the treatment team against the transmission of microorganisms use this type of mask for more protection against body fluids and other related potential issues.
Some N95 masks are even made from fabrics that have one-way vents that make them easier to breathe.
However, because the valve emits unfiltered air when exhaled, this type of mask does not prevent the user from spreading the virus, which is why some places have banned their use. 
Military Gas Mask
Chemical weapons are substances that damage humans.
As a result of direct contact of these substances with any part of the organism's body, its body becomes infected and the organism becomes infected with various general or exclusive diseases of that substance.
Currently, in the event of a military attack and the use of chemical bombs, filtered masks are used.
In many workshop and industrial jobs, the production of chemical masks is required during the production of products or even in special workshop environments that deal with chemical gases.
To prevent the penetration and entry of harmful chemical gases into the lungs of workers and employees special filtered gas masks are utilized. 
In fact, respiratory masks can be described as devices and equipment that prevent the inhalation and respiration of toxic and chemical gases to protect the respiratory system.
They are mostly used to prevent the entry of toxic gases into the lungs. the mask does this by filtering toxic gases and venting from a breathable source.