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 Beijing Zhonghuan environmental quality monitoring center professional third party environmental monitoring and testing agency
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Current position: cleanliness
Cleanliness
Date of issue: 2014-3-26 14:03:26 source: our website editor:

Cleanliness refers to the amount of dust (including microorganisms) in clean air.

According to the national standard of the people's Republic of China GB 50073-2001 (gbj73-84 has been abolished), the code for design of clean workshop (hereinafter referred to as the code) clearly stipulates four levels of air cleanliness (cleanliness refers to the degree of dust particles in the air in clean environment), and corresponding tables are made to show the classification standards

This is based on the U.S. federal standard 209E Clean Room The number of dust particles with diameter greater than or equal to 0.5um per cubic meter of air is strictly regulated in each grade. The code also states in detail that "for the counting of dust particles greater than or equal to 5 microns in a clean room with air cleanliness of class 100, multiple sampling shall be carried out, and the test value can be considered to be reliable when it appears repeatedly." The working environment of hard disk is required to be level 10, which is almost as dust-free as the ideal state. It is also impossible for ordinary working environment to achieve, and it is impossible for any civil fund to realize. However, from a practical point of view, level 100 is still feasible. After all, the data recovery process only takes a short time, which will not cause great impact for the time being. However, the capital investment of class 100 clean room is quite large, and almost most data recovery service providers do not have such strength.

Smaller service providers may choose 1000 clean rooms, which has seriously affected the effect. However, what is even more surprising is that some service providers even use 10000 class clean rooms, which is really a huge damage to the hard disk, and may lead to the burning of the data that had been expected to be recovered. However, due to the particularity of the data recovery industry, even if the operation fails, there is no responsibility. Therefore, such low-cost service providers prefer to sacrifice the success rate in exchange for low price, in order to attract some customers who do not know the industry. What is even more astonishing is that, in order to make it more obvious, these service providers actually claim to be class 10000 clean rooms and class 100000 clean rooms, attempting to confuse the public and the public with wrong concepts, so as to make customers mistakenly believe that the higher the value, the higher the cleanliness.

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