Mold is a common problem in cleanrooms, as it can easily grow and spread in environments with high humidity and poor air circulation. Here are some common sources of mold in cleanrooms:
- Water leaks or flooding: If a cleanroom experiences water leaks or flooding, mold can grow on the affected surfaces and in the surrounding areas.
- HVAC systems: Mold can grow in the ducts and filters of HVAC systems, and can be spread throughout the cleanroom through the air. Backed-up condensate drains could be allowing stagnate puddles to form.
- Cleanroom garments: Cleanroom garments, such as gloves and gowns, can become contaminated with mold if they are not cleaned and stored properly. If the garments are single-use, this may not be relevant.
- Incoming materials: Raw materials and packaging materials that are brought into the cleanroom can be contaminated with mold spores, which can spread throughout the facility. Cardboard and paper boxes are common sources.
- Poor sanitation: If a cleanroom is not properly cleaned and sanitized, mold can grow on surfaces and in hidden areas, such as crevices and corners.
- High humidity: High humidity in the cleanroom can create ideal conditions for mold growth. Mold seems to thrive when the relative humidity is above 70% RH.
- Personal hygiene and improper gowning: Employees who do not follow proper personal hygiene practices or gowning procedures may unknowingly bring mold spores into the cleanroom on their clothing or skin.
It’s important to regularly monitor the environment and the equipment in a cleanroom to detect mold early and prevent it from spreading. Also, it’s essential to maintain the cleanroom environment within the recommended temperature and humidity range, to ensure that the mold doesn’t grow and spread.