The clean room can be divided into the following levels: Class 1, Class 100, Class 1,000, Class 10,000, Class 100,000, Class 300,000, and Class 1,000,000.
Per cubic meter will be less than 0.5 micron particle size of the number of microdust control in the 3500 below, it has reached the international dust-free standard of the A level. Currently, the dust-free standard applied in chip-level production and processing is higher than Class A, and such a high standard is mainly applied in some higher-grade chip production. The amount of dust is strictly controlled at less than 1,000 per cubic meter, which is commonly known in the industry as the thousand level.
Extended information
China's first international highest grade "ISO 1" clean room integrated system in Nanjing Tianjia air-conditioning equipment company completed, and through the expert group assessment. Nearly 30 authoritative experts from the Chinese Academy of Sciences, the Chinese Academy of Engineering, industry associations, colleges and universities, including a number of academicians, unanimously assessed that the system is the first of its kind in China, up to the international advanced level.
In 1963, the U.S. developed the first set of international standards for clean rooms, and since then, the standards have been constantly revised. 1999, ISO unified the cleanliness standards of various countries and issued standards. The "ISO Class 1" is the highest requirement of the standard and is very difficult to realize.
There are only 0.5 particles of 0.1 micron per cubic meter of space inside the clean room. In a clean room, there are only 10 particles equivalent to one-thousandth of the diameter of a strand of hair.
Baidu Encyclopedia - Thousands of clean rooms
Baidu Encyclopedia - Clean room
People's Daily Online - Nanjing enterprise built the international highest-grade clean room is the first of its kind in China