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ISO/DIS 14644-17

ISO/DIS 14644-17, Particle deposition rate applications

In ISO 14644 Cleanrooms and associated controlled environments – Part 17: Particle deposition rate applications, the focus is on the rate that macroparticles larger than 5 μm deposit on surfaces, and the application of this information to controlling contamination in cleanrooms. The particle deposition rate (PDR) is an attribute of a cleanroom or clean zone that determines the likely rate of deposition of airborne particles onto cleanroom surfaces, such as product or process area

Scope of ISO/DIS 14644-17

This part of the ISO 14644 standards gives guidance on the interpretation and application of the results of the measurement of Particle Deposition Rate (PDR) on one, or more vulnerable surfaces in a cleanroom as part of a contamination control programme. It provides some guidance on how to influence the PDR and reduce the risk of particle contamination on vulnerable surfaces.

This standard gives information on how a cleanroom user can use the PDR measurements to determine limits that can be set for macroparticles on vulnerable surfaces. It also gives a risk assessment method by which an acceptable risk of deposition of particles onto vulnerable surfaces in a cleanroom can be established and, when this is not achieved, methods that can be used to reduce the PDR.

Note to entry: An alternative to the PDR is the particle obscuration rate which determines the rate of increase of coverage of particles onto an area of surface over time. The POR can be used in an analogous way to the PDR and the required POR for a specified surface can be calculated and the risk from deposited particles reduced.

This document is available as a draft international standard. It has not yet been approved as an international or American national standard.


View list of ISO 14644 Standards

 

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