Four Major Principles for Cleanroom Contamination Control
To maintain and control the cleanliness of a cleanroom, proper management systems are essential alongside investment in hardware and equipment.
Source of contamination
Contamination sources in cleanrooms are divided into external and internal ones. External sources mainly include air supply from air conditioning systems, air infiltration through gaps, building structures, cleanroom garments, duct materials, water supply and solvents. Internal sources consist of production equipment, personnel, tools, production processes, workbenches and packaging materials.
Contamination Source Control
Prevent Infiltration of External Dust
Maintain a positive pressure above 5 Pa in the cleanroom and ensure full airtightness of the construction. Thoroughly clean personnel, equipment and raw materials before they enter. Properly install and maintain air filters as well.
Prevent Indoor Dust Generation
Key control measures: select appropriate materials for cleanroom walls and floors, control dust generation from production equipment, manage on-site staff and cleanroom garments, and use special devices dedicated for cleanrooms.
Prevent dust accumulation indoors
Walls shall be smooth and free of dead corners. The cleanroom requires regular maintenance and cleaning. Reserve adequate space around all equipment.
Remove airborne dust particles in a timely manner
Ensure sufficient air change rate, rational space layout, and appropriate airflow velocity for exhaust systems and air conditioning.
