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I have been researching online for some information regarding clean rooms. I do perform some work on what I think is a ISO class 7 or less. Linear flow, HEPA filter etc. Maybe its the case of one of the units I spend most of my time, HSM and metrology lab. Most of my work is on a controlled temperature and clean environment: Overshoes, no machining particles, very neat, almost no dust, daily mopping. Actually, the only dust I find is blue cotton from the blue uniforms, acceptable and does not interfere on our +-2 micron tolerances. Traditional air conditioning with frequent filter maintenance. Would this be considered a “ISO class 9”? If not, what is an example of class 9? Thank you for your comments. source: https://www.linkedin.com/groups/78665/78665-6072852055758819330 Marked as spam
 Posted by Asked on November 18, 2015 12:00 am
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Wenwen Zhang
I am not sure what are you trying to ask here. If you rephrase your questions by listing them in way that can make me understand what's your concerns I might be able to answer your questions.
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ISO Cleanroom Classifications are usually associated with particulate counts rather than airflow. For instance, Class 7 cleanroom (class 10,000) should contain no more than 2,930 ppm of particulates that are less than 5 microns in size or 352,000 ppm of particulates less than 0.5 microns per cubic meter of room area.
A class 9 cleanroom should contain no more than 293,000 of particulates that are less than 5 microns ppm/m3. Reference http://www.terrauniversal.com/cleanrooms/iso-classification-cleanroom-standards.php Marked as spam
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Wenwen Zhang
Leonel, usually people don't specify their cleanroom level if they have a cleanroom 9. The most often levels are from 3 to 7.
Politically, to check if people really bother to check the particle count for class 9, the best way is to call a cleanroom level validation company. Technically, to check if the particles in your room will affect your experiment or measurement?", you can ask the vendors of your equipments about their requirements on installation environment or check the instruction. Then you can get your particle level measured by the third party to make sure your room air is the right room air or you can ask your environment control department. At the same time, you also need to consider your expectations on your quality, which totally depends on your specific applications. Hope it will help. Marked as spam
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Leonel Graça
That kind of sums up what I wanted to know. And confirms what I suspected Thank you very much.
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Leonel Graça
Kevin Galetto, as I do not have the ISO 16644, I only used http://www.takasago.com.sg/comparison-tables.html as reference. Class 9 does not even have a equivalent. Allegedly, Class9 would be equivalent to "Room air" in FED STD 209E at wikipedia.
I Interpreted this as "normal office air", no filtering as opposed to a dusty shopfloor. Carpentry, etc. Do people even bother measuring a Class 9 cleanroom if its simply "Room air"? 300k particles bigger then 5micron, not sure I have that in my metrology lab, where we measure +- 2microns. But then again, I never measured. Since Class 9 is the bottom of the scale, I was wondering in practical terms, what would define it. I mentioned air flow, because linear air flow contaminates less. What general applications does a Class 9 have? Marked as spam
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Leonel Graça
Ah and this chart here for applications, does also not show level 9 but for printed circuits does mention something below 8 standard. So Class9 must have applications. http://www.takasago.com.sg/application-of-cleanroom.html
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