How often do cleanroom garments need to be laundered?

Reusable cleanroom garments must be laundered at a frequency that aligns with the cleanroom's classification, the nature of the work performed, and regulatory guidelines. Below is a breakdown of laundering frequencies based on cleanroom classification and industry standards:

1. Laundering Frequency by Cleanroom Classification

ISO 8 / GMP Grade D: Garments are typically laundered every two days.

ISO 7 / GMP Grade C: Garments should be laundered and sterilized after each shift (per work session).

ISO 5–6 / GMP Grades A–B: Garments must be laundered and sterilized after each use or entry into the cleanroom. In some cases, garments are changed multiple times per shift if contamination risk is high.

2. Regulatory and Industry Guidelines

EU GMP Annex 1 and ISO 14644 emphasize that reusable garments must be processed in a qualified laundry facility, segregated from production areas, using validated cleaning and sterilization procedures.

EN 14065 outlines biocontamination control systems for industrial laundries, ensuring garments meet hygiene standards throughout the laundering process.

3. Monitoring and Lifecycle Management

The maximum number of laundering and sterilization cycles should be defined during garment qualification. This ensures garments remain effective and do not degrade over time.

RFID tracking and lifecycle monitoring are recommended to track the number of washes and ensure garments are retired before performance degrades.

Visual inspections after each wash are essential to check for damage, contamination, or wear.

4. Performance Considerations

Studies show that some cleanroom fabrics can withstand up to 50–100 wash/sterilization cycles, depending on the material and sterilization method (e.g., gamma irradiation vs. autoclaving).

Over time, repeated laundering can reduce particle barrier efficiency and increase shedding, so end-of-life testing is crucial.