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A new principle for selection of cleanroom sample locations is one of the major changes in the newly revised ISO 14644 standards now available from the Institute of Environmental Sciences and Technology (IEST), the Secretariat for ISO Technical Committee 209 (ISO/TC 209): Cleanrooms and associated controlled environments. Users of the current ISO 14644 standards are urged to review the new sampling plan in ISO/DIS 14644-1—Part 1: Classification of air cleanliness by particle concentration and ISO/DIS 14644-2—Part 2: Specifications for monitoring and periodic testing to prove continued compliance with ISO 14644-1 in comparison to the previous approach.
These documents, together considered the cornerstone of the ISO 14644 Cleanroom Standards Series, are available from IEST as Draft International Standards (DIS). Importantly, ISO/DIS 14644-1 and 14644-2 may be used as trade reference per agreement between customers and suppliers, necessitating an urgent need for an understanding of the revised provisions by those involved in contamination control. The DIS documents are under review by ISO member bodies for voting and comment by May 2, 2011, for approval for submission as Final Draft International Standards (FDIS). In the United States, public comments may be submitted to IEST through a form available on the IEST website at www.iest.org.
According to the ISO/TC 209 Working Group experts who developed the revisions, new provisions include a simplified classification process based on a more accurate scientific sampling method. The new statistically based plan for selecting sample locations calls for a greater number of locations, but in turn eliminates the need to apply a statistical test to the data. This approach reportedly allows for different concentration levels in different parts of the cleanroom and is designed to ensure with a given statistical confidence that at least 90% of the cleanroom area complies with the maximum particle concentration. An article detailing the statistics behind the revisions is scheduled for an upcoming special edition of the Journal of the IEST.
Educational courses to inform the controlled environments community about the revisions are planned by IEST this winter in California and on the east coast, and in Chicago during ESTECH, the IEST annual technical meeting, in May 2011. For further details or to order the documents, visit the IEST website at www.iest.org or call IEST at (847) 981-0100.
Founded in 1953, IEST is an international technical society of engineers, scientists, and educators that serves its members and the industries they represent (simulating, testing, controlling, and teaching the environments of earth and space) through education and the development of recommended practices and standards.
IEST is an ANSI-accredited standards-developing organization; Secretariat of ISO/TC 209 Cleanrooms and associated controlled environments; Administrator of the ANSI-accredited US TAG to ISO/TC 209; and a founding member of the ANSI-accredited US TAG to ISO/TC 229 Nanotechnologies.
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