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class 5 Electronic clean room-Non-electrostatic, mesh soft curtains, iron squares, AC fans
Overview of Cleanroom Cleanliness Classes
Cleanroom cleanliness standards are based on the number of dust particles in the air, and these classes reflect the purity of the air inside the cleanroom. Common cleanliness classes include ISO 1, ISO 2, ISO 3, ISO 4, ISO 5, ISO 6, ISO 7, etc., as well as Class 1, Class 2, Class 3, Class 4, etc. in the U.S. Federal Standard 209E. These class standards are usually based on the number of dust particles with a diameter greater than 0.1μm per cubic meter of air, and the higher the class, the higher the cleanliness.
Cleanliness Classes and Testing Requirements
The cleanliness class of a clean room is closely related to its corresponding test requirements. For example, an ISO 5 class requires that the number of particles with a diameter greater than or equal to 0.5 μm per cubic meter of air must not exceed 3,500, while an ISO 7 class allows for up to 3.5 million particles in this size range. The test method is usually based on ISO 14644-1 and involves testing equipment such as Laser Scattered Airborne Particle Counters (LSAPC) and Large Particle Counters.
Classification of clean rooms
Clean rooms can be categorized into Class 100, Class 1,000, Class 10,000 and so on according to the cleanliness level, and different categories correspond to different clean requirements and applicable scenarios. For example, Class 100 clean rooms are suitable for applications requiring extremely high cleanliness, such as semiconductor production; while Class 1000 and Class 10,000 clean rooms are widely used in pharmaceutical and food processing industries.
There are several key components involved in how a clean room works:
Ventilation System: Cleanrooms are equipped with an efficient ventilation system to maintain air flow and reduce particles and other contaminants. The system exhausts unclean air and brings in filtered fresh air.
Filters: Ventilation systems include filters such as HEPA (High Efficiency Particulate Air Filter) or ULPA (Ultra High Efficiency Particulate Air Filter) to capture and remove small particles, ensuring that airborne particulate matter is maintained at acceptable levels.
Air Quality Control: Clean rooms are usually constructed with negative or positive pressure systems to maintain a clean environment by preventing outside air from entering or inside air from escaping.
Clean Clothing: Operators are required to wear special clean clothing, including helmets, face masks, gloves and garments, when entering the clean room to minimize contamination brought in by personnel.
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