Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (08): 152-157.doi: 10.13475/j.fzxb.20200203207

• Column: Medical Protective Textiles • Previous Articles     Next Articles

Particle size conversion for mask filter efficiency test and comparability of different standards

YANG Xiaobing1,2(), CHENG Jun3, ZHANG Shouxin1,2, YAO Hong4, LU Lin1,2, DING Songtao1,2   

  1. 1. State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defense, Military Science Academy, Beijing 100191, China
    2. Beijing Key Laboratory of Ambient Particles Health Effects and Prevention Techniques, Beijing 100191, China
    3. Sinosteel Wuhan Safety & Environment Protection Research Institute Co., Ltd., Wuhan, Hubei 430081, China
    4. 3M China Company, Beijing 100176, China
  • Received:2020-02-17 Revised:2020-05-07 Online:2020-08-15 Published:2020-08-21

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Abstract:

To clarify the related scientific concept of particle size used in testing mask filter efficiency, this paper systematically introduced the basic concepts and descriptive methods of particle size and particle size distribution for filter efficiency test in the Chinese national standard GB 2626—2006 "Respiratory protective equipment-non-owered air-purifying particle respirator". On the basis of reviewing the concepts of respirable dust and mass median aerodynamic diameter(MMAD), emphasis was laid on the calculation method for converting the count median diameter (CMD) into MMAD, which proved that the CMD provided in GB 2626—2006 meets the requirement of MMAD 0.3 μm, the most penetrating particle size, used for the filter efficiency test. Based on the conversion method, the dust size with MMAD higher than 7 μm used in AQ 1114—2014 "Self-inhalation filter type dust respirator for coal mines" for filter efficiency test was discussed. The particle filter efficiency of typical filtration media used in masks was tested using the 0.3 μm particles. It provided professional guidance for the correct evaluation of domestic and foreign standards for particle masks.

Key words: mask, particle protection, particle size distribution, mass median aerodynamic diameter, most penetrating particle size, filter efficiency, standard

CLC Number: 

  • C976.2

Fig.1

Typical particle size distribution"

Fig.2

Particle size distribution after logarithm"

Fig.3

Relationship between physical diameter of irregular particles with ds and da"

Tab.1

Statistics of particle specification used for particle filter efficiency test in worldwide standards"

标准名称 标准国别
与地区		 测试用颗粒物特性
ISO 16900—3:2012《呼吸保护装置 试验方法和试验设备 第3部分:粒子滤波渗透的测定》 国际 NaCl颗粒:CMD为(0.06~0.10) μm,GSD为1.4~1.8;DOP颗粒:CMD为(0.16~0.21) μm,GSD为1.4~1.8。
EN 149:2001+A1 2009《呼吸防护装置 防护颗粒的过滤半面罩 要求、测试、标记》 欧盟
(34个国家)		 NaCl颗粒:MMD为0.6 μm,尺寸分布为(0.045~1.2) μm;石腊颗粒:ds为0.4 μm,尺寸分布为(0.045~2.0) μm。
42 CFR 84《美国呼吸护具标准》 美国 同GB 2626—2006
AS/NZS 1716: 2012《呼吸保护装置》 澳大利亚/
新西兰		 NaCl颗粒:MMD为(0.3~0.6) μm,尺寸分布为(0.02~2.0) μm。

Fig.4

Dust particle size distribution diagram used by AQ 1114—2014 to test filter efficiency of dust mask"

Fig.5

Relation between filter efficiency and fiber diameter"

Tab.2

Effects of different layers filtering materials on filter efficiency and air resistance"

样品层数 过滤效率/% 阻力/Pa
1 42.800 86
2 67.200 164
3 81.200 241
4 89.400 317
5 94.460 404
6 96.610 474
7 98.070 555
8 98.920 624
9 99.360 697
10 99.643 775
11 99.803 852
12 99.888 924
13 99.935 991
14 99.962 1 061
15 99.979 1 140
16 99.988 1 203
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