Sunday 24 August 2014

New draft ISO 14644 standard

A new part of the ISO 14644 series of cleanroom standards has been drafted. This is “Cleanrooms and associated controlled environments — Part 14: Assessment of suitability for use of equipment by airborne particle concentration.”

The draft is concerned with the cleanroom classification of air cleanliness by particle concentration to the suitability of equipment (e. g. machinery, measuring equipment, process equipment, components, tools and so forth) for use in cleanrooms and associated controlled environments.

Proposed tests include:

  • Airborne particle concentration measurement: The aim is to confirm that the test environment is at least one ISO-ACP class cleaner than the cleanroom or clean zone within which the equipment is intended to be used.
  • Airflow velocity measurement. Guidance range for vertical velocity should be in the range of 0,3 m/s to 0,5 m/s.
  • Temperature, Guidance range should be 18 °C to 25 °C
  • Humidity, Guidance range should be 30 % RH to 70 % RH
Additional informative pre-tests may include:

  • Airflow direction test and visualisation
  • Electrostatic and ion generator test
  • Particle deposition test
To review a copy of the draft standard, contact your local standards office.

Posted by Tim Sandle

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