Laboratory class iso5 clean room - anti-static, acrylic, stainless steel
Overview of Cleanroom Cleanliness Classes
Cleanroom cleanliness classes usually refer to the maximum permissible concentration of particles of a given size per unit volume of air. These classes are based on the specific requirements for clean environments in manufacturing processes and cover classes ranging from Class 100 to Class 10,000 and beyond. For example, the ISO 14644-1 standard categorizes cleanliness classes from ISO 1 to ISO 9, while the U.S. Federal Standard 209E categorizes classes from Class 1 to Class 100000.
Cleanliness Class Standards in Detail
International Standard ISO 14644-1
ISO 14644-1 is one of the most widely used cleanliness class standards. It stipulates the particle concentration limits corresponding to different cleanliness classes. For example, the number of particles larger than 0.5μm per cubic meter of air in a clean room of ISO Class 5 shall not exceed 3520, while the number of particles per cubic meter of air in a clean room of ISO Class 7 shall not exceed 3520000.
U.S. Federal Standard 209E
US Federal Standard 209E used to be the main cleanliness class standard in the United States, but was gradually replaced by ISO 14644-1 with the promotion of the latter. However, in some specific industries, the 209E standard is still used.
Chinese National Standard GB/T 25915
China's GB/T 25915 standard specifies air cleanliness classes for cleanrooms and related controlled environments, which includes detailed descriptions of particle concentration, particle size, and states, such as testing under air, static, and dynamic conditions.
Cleanliness Class Table
Ventilation system: Cleanrooms are equipped with an efficient ventilation system that moves air through fans to reduce particles and other contaminants in the air and replenish it with filtered fresh air.
Filters: Ventilation systems contain primary, medium and high efficiency filters that sequentially filter particulate matter of different sizes, ensuring that airborne particulate matter is kept within acceptable limits.
Air Quality Control: Clean rooms usually use negative or positive pressure systems to prevent external contamination from entering or internal contamination from escaping and to maintain a clean environment.
Clean Clothing: Operators are required to wear special clean clothing, including helmets, face masks, gloves and garments, when entering the cleanroom to minimize contamination from personnel.
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