What's the difference between KN95 and N95? Read this article to understand _ mask

Original title What's the difference between KN95 and N95 Read this article to understand Unexpectedly in 2020 due to the global spread of COVID-19 KN95 and N95 became hot words With masks becoming a worldwide shortage of materials people are confused about the differences between various types of masks in different countries around the world especially the widely used KN95 and N95 mask But if you understand the mask standard you will understand the mask Origin of KN95 and N95 The KN95 respirator is based on the Chinese standard Respiratory Protective Equipment Self-priming Filter Full Body Disposable Coverall Particulate Respirator (GB 2626-2006) The filter elements are divided into KN and KP according to their filtering performance KN is suitable for filtering non-oily particles and KP is suitable for filtering oily and non-oily particles According to the level of filtration efficiency and the level of filter elements masks can be divided into six categories KN90 KN95 KN100 KP90 KP95 and KP100 (full masks do not contain KN90 and KP90) KN95 mask That is to say the self-priming filter type anti-particle respirator has a filtering efficiency of more than 95% for non-oily particles Expand the full text (The picture of the product indicates that it conforms to the GB2626-2006 standard and is KN95 type) The N95 mask is in accordance with Appendix K of the Code of Federal Regulations NIOSH-42CFR Part 84 Standards for Certification of Respiratory Protective Devices-Filtration Particulate Filter Appendix K classifies filters into self-priming filter type particulate respirators and supply air filter type particulate respirators According to the filtering performance the filter elements of the self-priming filter type anti-particle filter are divided into three types N R and P The N type is suitable for filtering non-oily particles and the R and P types are suitable for filtering oily and non-oily particles The service time limit of type P filter element is longer than that of type R The service time of type R filter element is generally 1 working day Type P filter element can be recommended by the manufacturer according to the demand According to the level of filtration efficiency and the level of filter elements masks can be divided into N95 N99 N100; R95 R99 R100; P95 P99 P100 N95 mask That is to say the self-priming filter type anti-particle respirator has a filtering efficiency of more than 95% for non-oily particles Therefore conceptually speaking KN95 and N95 masks are self-priming filter anti-particulate respirators with filtration efficiency of more than 95% for non-oily particulate matter Since the concept is the same are the assessment indicators of the two masks the same Difference between KN95 and N95 key assessment indicators At present the testing basis of KN95 mask in China is GB 2626-2006 which is different from the assessment index of N95 It can be seen from Table 1 that there are many similarities between KN95 and N95 in terms of assessment indicators such as filtration efficiency respiratory resistance air tightness of exhalation valve visual field headband component requirements information provided by the manufacturer KN95 Face Mask packaging etc Leakage dead space air tightness flammability cleaning and disinfection are added to the assessment indicators of KN95 Note From July 1 this year the new standard GB 2626-2019 will be implemented The assessment index adds the assessment of practical performance The subjective evaluation provided by the subjects can more comprehensively reflect the performance of the mask during use Analysis of key technical index requirements It can be seen from Table 2 that there is a certain difference between the requirements of KN95 and the requirements of N95 mask indicators On the whole KN95 has higher requirements ① Requirements for respiratory resistance of KN95 respirator in GB 2626-2006 are consistent with those of N95 respirator However it should be noted that GB 2626-2019 has adjusted the requirements for respiratory resistance and has made specific provisions for whether there is a breathing valve and the overall requirements are higher than N95 For example the expiratory resistance of N95 with breathing valve in American Standard is required to be less than 250 Pa while that of KN95 is required to be less than 150 Pa with a reduction of 40% Therefore KN95 which meets the new standard is superior to N95 in terms of comfort ② The headband of KN95 respirator needs to be tested for tension while N95 respirator has no specific requirements for the tension value of the headband

③ KN95 masks have specific numerical requirements for dead space and visual field while N95 masks do not Difference between KN95 and N95 key assessment index test methods 1 Filtration efficiency : It can be seen from Table 3 and Table Medical Disposable Coverall 4 that in terms of filtration efficiency test the test conditions are the same but in terms of sample pretreatment KN95 is more complex than N95 and the conditions are more stringent which puts forward higher requirements for the filtration efficiency of masks The 2019 version of the new standard also adds cleaning and/or sanitizing pretreatments for products that claim to be cleanable and/or sanitized 2 Respiratory Resistance and Expiratory Valve Airtightness : It can be seen from Table 5 that KN95 and N95 are basically the same in the two indicators of respiratory resistance and exhalation valve tightness test but KN95 not only tests untreated samples but also tests pretreated samples so the evaluation of these two indicators of masks is more comprehensive and accurate By comparing the corresponding test standards of KN95 and N95 mask it can be found that the key indicators such as particle filtration efficiency respiratory resistance and exhalation valve tightness of KN95 and N95 masks are the same However the pretreatment conditions of KN95 mask in the test process are more complex and harsh and there are specific numerical requirements for headband tension connection and connection parts dead space visual field and other indicators while N95 does not Therefore on the whole KN95 masks require more than N95 mask and the comprehensive requirements are higher! The implementation of GB 2626-2019 on July 1 this year will put forward higher requirements for KN95 masks in terms of respiratory resistance air tightness practical performance cleaning and disinfection which can better reflect the performance of masks in actual use As long as the KN 95 mask meets the standard requirements the battle N95 mask is appropriate! Contributor Ningbo Customs Tariffs have been refunded and the second exclusion list of the second batch of goods subject to tariffs on the United States and Canada has been published involving 79 tax numbers Return to Sohu to see more Responsible Editor zjyuan-group.com