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Title: Airborne Particulate Cleanliness Classifications Via ISO 14644-1 And FED-STD-209E
Author: Alvin Lieberman
Source: 1997 Measurement Science Conference
Year Published: 1997
Abstract: For many years, the primary cleanroom standard in many areas has been Federal Standard 209, the current issue being 209E. An ISO cleanroom classification document, ISO 14644-1, is nearly ready for release and it is expected to be used worldwide. Many industrial operations in the USA can expect requirements for international sales to include compliance with that ISO document. This presentation reviews the content of Fed-Std-209E and presents information on ISO 14644-1 with explanations of the significant similarities and differences between the two documents. Areas where major differences are present include the number of classification levels, the number of particle size thresholds that can be used to define cleanroom classifications, and the number of sample point locations that must be measured to verify that cleanroom classification. Minor differences in the two documents will also be discussed. These include the requirement for capability of defining macroparticle levels as well as ultrafine particle levels without affecting the cleanroom classification.

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