Cleanliness and standard of cleanliness in cleanr
Time：2018-05-15 12:38 Click：
Cleanliness and cleanliness of clean air are the extent of the amount of suspended particles in the air in a clean environment. Generally, the low dust content in the air leads to high cleanliness of the air and low dust concentration. According to the concentration of suspended particles in air, the degree of air cleanliness in clean rooms and related controlled environments is determined. The air cleanliness grade is determined by the maximum allowable particle number per cubic meter of air.
What is the one hundred thousand grade high cleanliness workshop? 10W clean room refers to the workshop inside particles per cubic meter control within 10W clean room production workshop is mainly used in electronics industry and pharmaceutical industry, food industry, if there are 100 thousand production workshop is quite good! There are usually 10, 100, 1000, 10000, 100000, and 300000!
The formulation of cleanliness standards - the countries concerned have set their own standards before, but they are basically in reference to the various editions of the American Standard FS-209. Only the system of units and the nomenclature have been changed or changed. The name can be divided into two categories: one is based on per unit volume of air is greater than or equal to a predetermined number of particle size directly named or with the symbol name, this nomenclature in the United States as the representative of FS-209A ~ E version, the required particle size of 0.5 m, the concentration of particles in the air more than 0.5 m particle the size of the British pc/ft3 directly named, such as the standard in 100, said the air more than 0.5 m diameter of the particle concentration is 100pc/ft3 directly named, namely quantity per cubic foot of air in more than 0.5 m particle sizes of 100, (we usually use is commonly international unit. Refers to every cubic meter of air containing more than 0.5 m diameter of the particle number, because 1 cubic meters about 35.2 cubic feet, so we see the standard in 100 corresponding to more than 0.5 m diameter of the particle number is not 100, but 3 520, that's the point.). The two is in unit volume of air is greater than or equal to the specified particle size and the number of 10N said, according to the n index named air cleanliness level, this nomenclature represented by the Japanese JISB9920, the particle size of 0.1 M, the concentration of particles in the air more than 0.1 M particle size (the national standard unit preparation of 10N pc/m3) named n, such as the standard of grade 2, said more than 0.1 M particle size concentration is 100 pc/m3, namely 102pc/m3. This nomenclature is also used in Russian standards. Now the international standard ISO14644-1 has been issued and the United States standard FS-2009E was declared discontinued in November 2001. According to the international standard, the suspended particles in the air cleanliness level named number N, all considered particle size D maximum allowable concentration of Cn is determined using a formula: the formula: Cn-- is considered the maximum allowable concentration of particle size of air suspended particles, pc/m3. Cn is an integer of four to five homes in similar, usually not more than three effective digit number; N-- classification number, number does not exceed 9, grade number integer number can be specified in the middle, minimum allowable increments of N was 0.1; D-- was considering the particle size, m; 0.1 - constant, its dimension is m;
Clean room in China Standard (1) of our country clean room is the standard "code for design of clean" (GB50073-2001), air cleanliness standards stipulated in the relevant provisions of the international standard equivalent in ISO1466-1. Cleanliness level of suspended particulates in clean room and clean area is shown in the following table:
The air cleanliness level table 2.0.1 grade per cubic meter (per liter) in the air more than 0.5 micron particles per cubic meter (per liter) in the air more than 5 micron particle number 100 is less than 35 * 100 (3.5)
= 35 x 1000 (35) = 250 (0.25) = 35 * 10000 (350) = 2500 (2.5) = 35 * 100000 (3500) = 25000 (25)
Classification and regulation of purification level
Trade standards (classification and regulation of cleanliness level)
The United States federal standard (USA Federal Standard) the clean class of particles in the air control airborne particulate cleanliness grade (per cubic foot per cubic metre, the maximum particle concentration limit) ISO14644-1 FED STD 209E CLASS Number of Par Cubic Meter by Micrometer Size ISO Class English Metric m3 m3m3 FT3 m3 12 ISO1 ISO2 43510353100353029 10003530029310000 3530002930100000 353000029300 0.1um 0.2um 0.3um 0.5um 0.5um 5um
31, M1.5, 1SO3, 410, M2.5, ISO4, 5 (100), 100, M3.5, ISO5, 6 (1000),, M4.5, ISO6
7 (10000 class) 10000 M5.5 ISO7 8 (level one hundred thousand) 100000 M6.5 ISO8