When the 2015 version was released, it removed the standard 5 µm classification limit, causing widespread confusion regarding pharmaceutical (EU GMP) vs. electronics (ISO) standards. The 2022 amendment fixes this by introducing .
If you are using the old 1999 or 2015 standards for 5 µm monitoring without the "M" descriptor, your classification could technically be considered non-compliant with the latest ISO guidelines. The 2022 update validates what many pharma cleanrooms were already doing—testing for large particles using specialized tools.
So, before you download an outdated PDF from 1999 or 2015, let’s break down what this amendment actually changes—and what it leaves alone.
Make sure your quality team has the addendum in their library. Don't rely on a pre-2022 PDF for your next regulatory audit. Disclaimer: This blog is for informational purposes only. Always refer to the official ISO documentation for specific compliance requirements.
If you never test for particles > 5 µm, this amendment does not affect your daily operations. However, if you do test for big particles, you must now use the "M" descriptor and the alternative sampling methods outlined in the 2022 text.