The most complete interview summary: how should N95 masks be tested?

As the "new crown epidemic" slowly dissipates, major enterprises are beginning to resume normal operations. Because of the loss of many staff caused by the epidemic, companies also began to frantically recruit fresh talent, which is undoubtedly an opportunity for new job seekers. However, because of the large number of job seekers, many interviewers also began to find ways to filter the talent they need, there are also a lot of "strange" interview questions.

N95 mask general knowledge

N95 type mask, is NIOSH (National Institute for Occupational Safety and Health) certification of nine kinds of anti-particle masks in one. "N" means not suitable for oily particles (frying fumes are oily particles, and the droplets produced by people talking or coughing are not oily) "95" means that under the testing conditions specified in the NIOSH standard, the filtration efficiency reaches 95%. N95 is not a specific product name. As long as the product meets the N95 standard and passes the NIOSH review, it can be called "N95 mask".

Thinking about N95 mask testing

Knowing the basic knowledge of masks, we still consider the testing points of this "N95 mask" from 6 aspects according to the thinking of testing.

Consider from the functional aspect

Protects against certain particles such as dust from grinding, sweeping and handling minerals, flour and certain other materials;

Protects against liquid or non-oily particulate matter generated by spraying;

Effective filtration and purification of inhaled abnormal odors, except for toxic gases;

Reduces the exposure level of certain inhalable microbial particles such as mold, Bacillus anthracis, Mycobacterium tuberculosis, etc;

Can protect against germs with a filtration efficiency of 95% or more;

Test some oily particulate matter to determine if it cannot be protected.

Consider from the interface aspect

Look at the packaging to see whether there is a trade name, whether there is information about the manufacturer or supplier, whether there is a certificate of conformity or instructions for use of the mask;

If it is a disposable mask, there is also a disposable logo, and for reusable medical protective masks, the sterilization method should be indicated;

The materials used should be odorless and harmless to human body, especially the human face contact part of the material, should not be irritating and allergic;

The mask packaging is complete, there is no damage, the mask surface should not have holes, stains;

Medical protective masks should not have an exhalation valve;

Whether the length, width and thickness of the mask are in accordance with the corresponding standards;

Whether the mask is equipped with nose clip, nose clip made of bendable plastic material, and the length meets the requirements;

Consider from the aspect of compatibility

The mask can be adapted to various face shapes, and the fit of various face shapes can be guaranteed;

It can be suitable for various skin types, and the contact will not cause sensitivity and other reactions.

Consider from the aspect of performance

If you squeeze the mask or tear the mask, it will be broken or easily damaged;

If the mask is worn for too long, the protective effect of the mask will be reduced;

Whether the nose clip of the mask will break easily if it is repeatedly folded.

Consider from the aspect of safety

The more airtight the mask is, the safer it is; but at the same time, the more airtight it is, the more difficult it is to breathe, especially for patients with cardiovascular disease, whether it will cause dizziness and breathing difficulties due to lack of oxygen and other risks;

The material of the mask does not cause allergic reactions (here is a duplicate of the ease of use, you can remove the weight ~);

The material and taste of the mask are non-toxic and will not cause adverse reactions;

Whether the earband mask will strangle the skin when worn for a long time.

Consider from the aspect of ease of use

The inside and outside of the mask, the top and bottom are easy to distinguish and easy to wear;

The upper edge of the mask is easy to press the nose clip, easy to fit tightly on the face;

The mask is easy to fold, easy to carry.

The overall idea as above analysis, of course, the interviewer will certainly not ask you to cover every point, after all, the interview is so short time can not think of such a full test points. So the focus is on testing ideas: the main focus on functionality (from positive + negative coverage), and then cover non-functional (including interface, compatibility, performance, security, ease of use five aspects).

In addition, if you want to know more about N95 Face Mask test instruments of 3 test methods, please leave us a message!