Sources of pollution in the clean room and its solution
• foreign resources
The outside air has more particles than inside the clean room. In addition, air entry and exit ways such as under the doors and various seams cause the entry of outside air.
solution :
- Use of high efficiency filters in several filtration stages
- Create a pressure difference in the clean room
- Reduce seams
internal resources
- Surfaces that produce particles, such as walls, floors, etc.
- Chemical vapors
- Process activities
- cleaning etc…
- One of the sources of pollution is particles that are produced from the surface of human skin and clothes.
solution :
- Increasing air movement (Air-Change)
- Refiltration
- Proper airflow pattern
- Clothes suitable for a clean room (Gowning)
- Cleaning materials and equipment before entering the clean room
Clean Room Properties
All levels must:
- be smooth and uniform
- be without defects
- Easy to clean
- Do not produce particles
- Be resistant to pressure differences
- Their structure should be such that they do not absorb particles and microbes
- Avoid the accumulation of particles from the horizontal surface
- Roofs must be completely sealed with silicone
- The entrance of channels and pipes must be completely sealed
- The meeting place of the walls, ceilings and floors should be connected by profile profiles so that they can be easily cleaned
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