EN ISO 14644-17:2021 PDF

Overview - EN ISO 14644-17:2021 (Particle deposition rate applications)

EN ISO 14644-17:2021 is part of the ISO 14644 cleanroom series and provides guidance on using measurements of particle deposition rate (PDR) - and the related particle obscuration rate - to manage contamination on vulnerable surfaces in cleanrooms and controlled environments. The standard focuses on macroparticles (chiefly >5 µm), explains how to interpret PDR results as part of a contamination control programme, and describes how to reduce the risk of particle deposition through measurement, risk assessment and control actions.

Key topics and technical requirements

• Scope and focus
  • Application of PDR measurements to determine limits for macroparticles on vulnerable surfaces.
  • Consideration of particle obscuration rate as an alternative metric for surface light-obscuring contamination.
• Measurement methodology
  • Methods for measuring particle deposition rate on exposed surfaces during operational conditions (operational state emphasized).
  • Annexes provide measurement guidance, examples and calculation relationships between PDR and airborne concentration.
• Establishing limits and risk assessment
  • Guidance to translate an acceptable contamination risk into required PDR/obscuration limits for a given surface area and exposure time.
  • Methods to identify when required control is not achieved and how to respond.
• Control and reduction measures
  • Recommendations on using monitoring data to correlate PDR peaks with activities and to modify procedures, cleaning, personnel or engineering controls to reduce deposition.
• Documentation and traceability
  • Requirements to document PDR measurement results, risk assessments and control actions as part of the contamination control programme.
• Explicit exclusions
  • The standard does not classify cleanrooms by PDR/obscuration, does not directly address contact-transfer deposition, and does not specifically treat microbe-carrying particles (though they may be considered as particles).

Practical applications - who uses it

• Contamination control engineers, cleanroom validation and quality assurance teams, process engineers and facility managers in industries such as:
  • Aerospace, optics and solar panels (sensitivity to light-obscuring particles)
  • Microelectronics and semiconductors
  • Pharmaceuticals, medical device and healthcare manufacturing
  • Food, nuclear and other contamination-sensitive manufacturing
• Typical uses: setting surface contamination limits, designing monitoring plans, investigating deposition events, and optimizing cleaning and operational procedures.

Related standards

• ISO 14644‑1 (cleanroom airborne particle classifications)
• ISO 14644‑3 (methods for deposition determination)
• ISO 14644‑9 and IEST-STD-CC1246E (surface particle concentration guidance)

Keywords: EN ISO 14644-17:2021, particle deposition rate, particle obscuration rate, cleanrooms, contamination control programme, vulnerable surfaces, macroparticles, cleanroom monitoring.