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My country's first national standard for civil protective masks issued

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  • Time of issue:2019-08-14
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(Summary description)Due to the lack of unified standards and specifications, the quality of "anti-fog masks" varies, and market competition is chaotic.

My country's first national standard for civil protective masks issued

(Summary description)Due to the lack of unified standards and specifications, the quality of "anti-fog masks" varies, and market competition is chaotic.

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2019-08-14
  • Views:0
Information

Due to the lack of unified standards and specifications, the quality of "anti-fog masks" varies, and market competition is chaotic. On April 25, the General Administration of Quality Supervision, Inspection and Quarantine and the National Standardization Management Committee issued the national standard "Technical Specifications for Daily Protective Masks", which is my country's first national standard for civil protective masks. The standard will be officially implemented on November 1st, and it clearly stipulates the protection effect and safety performance of fine particles (PM2.5).

"This will change the chaotic phenomenon of non-standard compliance and non-standard inspection in our national protective mask market, and will play a positive role in ensuring the effective regulation of the market and reasonable guidance of consumption." The China Industrial Textile Industry Association, which participated in the formulation of the standard Li Lingshen said.

At present, the standards for masks in my country are "self-priming breathable protective filter anti-particulate respirator" "technical requirements for medical protective masks" and "surgical surgical masks", but they all belong to labor protection and medical protection standards. The so-called civil anti-fog masks on the market have been lacking in standard specifications.

For example, many masks use "filtration efficiency" to express their anti-fog performance, and often claim to "filter efficiency is more than 90%". Li Lingshen pointed out that the filtration efficiency only refers to the core part of the mask-the filtering effect of the filter cloth material, and does not represent the protective effect of the mask, because the mask also has the problem of sealing. Even if the filtering effect of the filter cloth can really reach 99%, if the sealing is not good, the protective ability of the mask should be greatly reduced.

In view of this, the "Daily Protective Mask Technical Specifications" uses a comprehensive index such as "protective effect" for the performance of masks, and the performance of the mask is defined by the intuitive effect of "the quality of the air inhaled after wearing the mask". This can avoid the current masks only focus on the filtering effect and ignore the lack of sealing.

"According to the standard, the mask can reduce the inhaled PM2.5 concentration to less than 75 micrograms per cubic meter, so that the quality of the filtered air inhaled into the body can reach good and above levels," Li Lingshen pointed out.

The air inhaled after wearing the mask should at least meet the "good" level in the air quality standard, but the air outside the mask is very different, which puts different requirements on the performance of the mask. Therefore, the standard divides the protection level of masks from low to high into four levels: Class D, Class C, Class B, and Class A, respectively corresponding to the setting of air quality categories and air pollution in the national air quality standards-Class D adaptation For moderate pollution (PM2.5 concentration ≤ 150 micrograms per cubic meter) and below, grade C is suitable for severe (PM2.5 concentration ≤250 micrograms per cubic meter) and below pollution, and grade B is suitable for severe pollution (PM2.5 Concentration ≤350μg/m3), Grade A is used when PM2.5 concentration reaches 500μg/m3.

In other words, you can look at the air pollution before going out, and then choose the mask to wear according to the actual situation. "It is not recommended to wear masks for long-term and super-grade." Li Lingshen reminded that the higher the protective effect of the mask, the higher the relative respiratory resistance, and wearing a high respiratory resistance mask for a long time will have an adverse effect on health.

It is understood that in order to ensure the safety of the public when wearing protective masks, the standard requires that masks should be able to protect the mouth and nose safely and firmly, and there should be no sharp angles and sharp edges that can be touched. Formaldehyde, dyes, microorganisms, etc. may affect people The factors that cause physical harm are detailed in the standards. It also stipulates that materials that may be harmful to the human body should not be used. Taking into account the safety of the wearer when walking, the standard stipulates that the field of view below the mask should not be less than 60 degrees to avoid affecting the wearer's sight due to the high arch design.

"Generally speaking, the higher the protection performance, the greater the impact on comfort performance. When people wear a mask, they have a certain resistance to the air flow when inhaling. When the inhalation resistance is too large, people will feel dizzy and chest tight. Uncomfortable conditions. Different physical constitutions, different feelings of comfort." Li Lingshen said that the standard is to maximize the comfort of the wearer on the premise of ensuring the protective effect.

Li Lingshen said that due to the large differences in children's physical characteristics, the accumulation of medical data and experimental data on the impact of respiratory resistance on children's growth has yet to be perfected, so the standard does not make special provisions for children's masks, but clearly states that the standard "Not applicable to children's masks".

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