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What is Federal Standard 209e
The outmoded (replaced by ISO 14644) benchmark for optimum and safe operating levels is compared to
Federal Standard 209e.

Notice:
Federal Standard 209E has been replaced with ISO Standard 14644. The first subsection in ISO 14644
(ISO STND. 14644-1) has some unique changes from the old Federal Standard - however they are very
similar. This standard is now in effect for critical environments (Cleanrooms, Data Centers, etc.) worldwide.

The main differences between Federal Standard 209E and ISO 14644-1 (Testing Standards) are: ISO Establishes
0.1um as the "Standard" Diameter

x ISO Creates 3 New Cleanliness Classes-
o 2 "Cleaner" classes (ISO class 1 and ISO class 2) than Federal Standard 209E
o 1 "Dirtier" Class (ISO Class 9) which is allows more particulate than Fed Standard 209E
class 100,000

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