Federal Standard 209E

Federal Standard 209E (FED-STD-209E) was a standard that classifies cleanrooms in relation to the limits of airbourne particles in the air of the cleanroom per volume. The classification divides the cleanrooms into six classes.

Class 1
Class 10
Class 100
Class 1000
Class 10000
Class 100000

The FED-STD-209E was superseded by the ISO standard 14644 under the recommendation of the IEST Working Group CC100. Despite the cancellation of the Federal Standard, it is still used throughout the cleanroom industry.


  1. adarsh barik

    i wanted to know that is there any standard set for the satellite regarding cleanroom, I mean , do we need to have a cleanroom of class more than some specific standard to get our satellite launch and if yes what is it?

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