Cleanrooms are classified based on the number of particles per cubic meter of air at a specific particle size. The cleanroom classification system is based on the ISO 14644-1 standard, which sets the international standards for cleanroom cleanliness.
The cleanroom classification ranges from ISO Class 1 (the cleanest) to ISO Class 9 (the least clean). In an ISO Class 1 cleanroom, there can be no more than 10 particles of 0.1 microns or larger per cubic meter of air. In contrast, an ISO Class 9 cleanroom allows up to 35 million particles of 0.5 microns or larger per cubic meter of air.
Therefore, the cleanroom that is considered the cleanest is the ISO Class 1 cleanroom, which has the lowest concentration of particles per cubic meter of air. However, it is important to note that the level of cleanliness required for a particular application depends on the specific requirements and standards of that application.
Cleanrooms are classified based on the number of airborne particles per cubic meter. The cleanroom classification system is based on ISO standards. ISO 14644-1 is the standard that specifies the classification of air cleanliness in cleanrooms and associated controlled environments.
Cleanrooms are classified from ISO Class 1 to ISO Class 9, with ISO Class 1 being the cleanest and ISO Class 9 being the least clean.
ISO Class 1 cleanrooms have a maximum allowable concentration of 10 particles of size 0.1 microns or larger per cubic meter of air. On the other hand, ISO Class 9 cleanrooms have a maximum allowable concentration of 35,200 particles of size 0.5 microns or larger per cubic meter of air.
Therefore, ISO Class 1 cleanrooms are the cleanest. They are typically used in highly sensitive applications such as semiconductor manufacturing, nanotechnology research, and biotechnology research.
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