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Laboratory class 7 clean shed - anti-static, acrylic, iron cube, AC fan
Classification of cleanliness level of clean room
Cleanroom cleanliness levels are usually categorized by the size and number of particles, including Class 8 Class 7, Class 6, Class 5, and other different levels. These levels of clean rooms are suitable for different industries and uses, for example, Class 8 may be used for general electronics manufacturing, while Class 5 may be used for cutting-edge production of semiconductors or biotechnology.
Clean room cleanliness standards
Particle concentration: This is the most important measure of cleanliness and is usually expressed as the number of particles of a specific size per cubic meter of air. For example, in the ISO 14644-1 standard, ISO Class 1 indicates a maximum of 10 particles of 0.1μm per cubic meter of air, while ISO Class 9 indicates a maximum of 35,200,000 particles of 0.5μm.
Temperature and humidity control: The temperature and humidity inside the clean room also need to be strictly controlled to ensure air cleanliness and avoid static electricity problems caused by over-drying. Generally, the temperature is controlled between 18°C and 26°C, and the humidity is controlled between 45% and 65% RH.
Air flow: air flow inside the clean room should be smooth, no dead ends, and to ensure proper air supply and exhaust air volume, pressure difference, air flow and so on.
Material selection: the building materials, decorative materials and clean equipment of the clean shed should be selected from materials that do not easily produce dust and odor to avoid secondary pollution.
Other requirements: It also includes the requirements of fire prevention, anti-static, anti-radiation, sterilization and so on.
Cleanliness level table
Ventilation System
The ventilation system of the clean room is its core component. Through high-efficiency ventilation equipment, such as FFU (Fan Filter Unit), the external air is continuously inhaled and purified through multiple filters, and finally sent into the clean room uniformly at a certain wind speed, so as to maintain the cleanliness of the room.
Filter
Filters are the key to ensuring air cleanliness and usually include primary, intermediate and high efficiency filters to intercept particles of varying sizes. The use of HEPA (High Efficiency Particulate Air) or ULPA (Ultra Low Penetration Air) filters captures and removes microscopic particles, ensuring that airborne particulate matter is maintained at an acceptably low level.
Air Quality Control
Clean rooms are usually designed to maintain a clean environment by using negative or positive pressure systems to prevent the entry of contaminated air from outside or the escape of contaminated air from inside.
Clean Clothing
Operators are required to wear special clean suits, including helmets, masks, gloves and clothing to minimize contamination from the human body when working in the clean room.
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