What grade is ISO 5?

There are many different ways of describing an ISO 14644-1 class 5 cleanroom. These can include; ISO 5 cleanroom, grade 5 cleanroom, ISO 5, class 5.

ISO 14644-1 class 5 is equivalent to the old US federal standard 209 class 100. 

To compare this to the EU GMP standard, Grade A is approximately ISO class 4.5.

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