Is the mask blue or white on the outside

Some masks are not like the ordinary masks sold outside, where you can see the front and back sides clearly. For example, the masks used in hospitals are white on the outside and blue on the outside, so people cannot distinguish which side should be worn. In fact, for masks, it depends on what type of mask it is. Generally, wearing a mask is not that complicated, and there are markings on the front and back.

How to choose a mask

The mask should be used according to its instructions. When worn, it must completely cover the nose, mouth and chin, and keep the mask close to the face. People with heart or respiratory problems (such as asthma and emphysema), those who feel dizzy, have difficulty breathing, and those with sensitive skin are not recommended to wear masks, and outdoor activities should be minimized. Do not wear a mask of too high a level when cycling or exercising to prevent breathing difficulties.

How to wear a mask and precautions

Purchase through formal channels; choose masks with corresponding protection levels according to different levels of air pollution; when choosing a mask for the first time, you need to refer to the product instructions for trial wearing and purchase products that fit well with your face; if you experience discomfort or adverse reactions during wearing, you should stop wearing the mask; generally speaking, wearing masks with high breathing resistance for a long time may have adverse effects on your health, so it is not recommended for consumers to wear protective masks for a long time or at excessive levels.

Types of disposable masks Two-layer masks

Generally, two-layer masks are mainly used in food processing factories. There is no filter meltblown cloth in the middle, but two non-woven fabrics sewn together. Its main function is to prevent substances in the mouth from entering the food, such as saliva, sneezing, colds, etc. Its gram weight is generally around 45 grams.

The three-layer mask has a filter meltblown cloth in the interlayer, which is suitable for use in medical structures, outdoors, dusty factories and other places. It is composed of double-layer non-woven fabric + a middle layer of filter meltblown fabric, which should be mentioned here. The four-layer activated carbon mask adds another layer of activated carbon paper to the original three-layer non-woven filter paper, which better improves the ability to filter dust and bacteria.

This is the gray-black mask that everyone has seen. However, it is generally sufficient to wear a three-layer mask outdoors, and of course it is completely acceptable to wear a four-layer mask. Particle protection mask

Particulate protection masks are a major category of professional protective masks. They are designed to protect against various particulate air pollutants such as dust, smoke, and smog, provide respiratory protection for the wearer, and are personal protective equipment. In the workplace, particulate protection masks are used to protect workers and reduce occupational diseases such as pneumoconiosis and chronic poisoning caused by air pollutants generated at work entering the human body through the respiratory tract.

In recent years, the public has become increasingly concerned about air pollution (such as excessive PM2.5 concentrations), and outbreaks or epidemics of respiratory infectious diseases caused by newly emerging pathogenic viruses have also occurred from time to time. Many people will spontaneously choose to wear masks to protect themselves when going out, making particulate protection masks more widely used.

There are many more types of masks, which I will not mention here. Other types of masks are mainly used in industry, chemistry, etc. and have nothing to do with ordinary people like us.