Laboratory class 7 clean room - non-electrostatic, mesh soft curtain, iron cube, AC fan
Overview of clean room classification standards
Clean room class standards are mainly based on the number of dust particles in the air with a particle size greater than 0.1 μm to classify, common ISO 14644-1 and the U.S. Federal Standard 209E two standards. ISO 14644-1 will be divided into ISO 1 to ISO 9 nine levels of cleanliness, the higher the level, the higher the cleanliness. The U.S. Federal Standard 209E is divided into Class 1 to Class 9.
Clean room testing standards in detail
Air Supply and Exhaust Volume
For a turbulent flow clean room, the air supply and exhaust volumes are measured, while for a unidirectional flow clean room, the air velocity is measured. This is due to the difference in airflow control between the two types of cleanrooms.
Airflow Control
In order to ensure the correct direction of airflow in a clean room, i.e., from a clean area to an area with poor cleanliness, it is necessary to check whether the pressure difference between the various zones is correct and whether the direction of airflow movement is correct at doorways or openings such as walls and floors.
Filter Leakage Inspection
High efficiency filters and their frames are inspected to ensure that suspended contaminants do not pass through damaged filters or gaps between filters and their frames.
Containment Leak Detection
Testing to ensure that suspended contaminants do not pass through building materials into the cleanroom is an important step in ensuring that the cleanroom is airtight.
Indoor Airflow Control
Depending on the airflow pattern of the cleanroom, either turbulent or unidirectional, it is necessary to verify that there are no areas of inadequate airflow operation within the room.
Cleanliness Classification Chart
The working principle of the clean room
The working principle of clean room mainly relies on air filtration and positive pressure control technology. Through high-efficiency air filters, such as HEPA or ULPA filters, to capture and remove small particles in the air, with the forced ventilation system, the continuous inflow of filtered fresh air, while discharging contaminated air, in order to maintain the cleanliness of the shed.
Structural characteristics of clean room
The structural design of a clean room takes into account the need for easy assembly, movement and expansion. A modular design is often used to facilitate the upgrading of cleanliness levels, as well as possible relocation or reuse in the future. Its internal space can be flexibly configured as needed to accommodate different production or experimental needs.
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