What is the cleanliness level of the cleanroom

The cleanliness of a cleanroom is classified based on the number of dust particles in the air, and common cleanliness levels include ISO 14644-1 and US Federal Standard 209E. The following is a detailed explanation of the cleanliness of the cleanroom under these two standards:
1、 ISO 14644-1 standard
The ISO 14644-1 standard divides cleanliness levels into eight levels, ISO 1 to ISO 8, with higher levels requiring stricter cleanliness requirements. Specifically for clean rooms, common levels include:
Class 100 cleanroom (also known as ISO Class 5 cleanroom): The number of particles greater than or equal to 0.5 microns per cubic meter of air is less than 3520 (some say it ranges from greater than 350 particles/m ³ to less than or equal to 3500 particles/m ³, but this range may vary depending on different standards or specific definitions). It is commonly used in chip manufacturing in the microelectronics and semiconductor industries, as well as in fields such as biomedicine and precision instruments, requiring extremely high cleanliness.
Class 1000 cleanroom (also known as ISO Class 6 cleanroom): The number of particles greater than or equal to 0.5 microns per cubic meter of air is less than 35200. Suitable for fields such as medical device production, drug packaging, and precision machining.
Class 10000 cleanroom (also known as ISO Class 7 cleanroom): The amount of particulate matter in each cubic meter of air is less than 352000. Suitable for some production fields with low cleanliness requirements, such as food processing, chemical production, etc.
100000 level cleanroom (also known as ISO 8 level cleanroom): The number of particles in each cubic meter of air is less than 3.52 million. It is usually used in environments with low cleanliness requirements, such as general laboratories, electronic assembly, etc.

2、 US Federal Standard 209E
The US Federal Standard 209E divides cleanliness levels into four categories: Class 100, Class 1000, Class 10000, and Class 100000, with Class 100 having the highest requirements. It should be noted that the unit in this standard is per cubic foot, while in the ISO standard it is per cubic meter. The Class 100 cleanliness standard requires that the number of dust particles with a diameter greater than 0.5 microns per cubic foot of air should not exceed 100.
summary
The cleanliness of a cleanroom should be selected according to the needs and application scenarios, but generally speaking, a Class 100 cleanroom has the highest cleanliness requirements and can meet extremely high cleanliness demands. In practical applications, selecting the appropriate cleanroom level is crucial for ensuring product quality and the degree of purification in the production environment. At the same time, in order to ensure that the cleanliness requirements of the clean shed can be continuously met, it is also necessary to maintain and operate the clean shed equipment appropriately.
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