I forgot your second question. The device that counts particles in a clean room actually is called a particle counter.
Reminds me of the time I asked some one "What is that black bird with the red on its wings?"
Best regards,
Raye Rivera
QA Manager * Canoga Perkins * 818-678-3872 * [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rivera, Raye
Sent: Friday, May 10, 2013 9:58 AM
To: [log in to unmask]
Subject: Re: [TN] IPC Class 2 Clean room specification
Hi Hermina,
I have never seen an IPC spec for clean rooms. Wikipedia has a good listing of the various specifications for clean rooms. There is a British Standard BS 5295 that defines a Class 2 clean room.
http://en.wikipedia.org/wiki/Cleanroom
In the US we usually use Class 10,000, 1000, 100, 10, etc. A class 10 clean room will have less than 10 particles per cubic meter of air that are greater than .05 micron. The definition is actually a bit more complicated than that, but this is the easy way to remember.
It has been quite some time since I specified a clean room, but a critical thing to understand early on is what particle size will cause a defect in your process. Wafer fabrication operations can be spoiled by half-micron particles or smaller. If you are doing optical assembly or lamination, you may only care about particles larger than 5 microns. The cost to control very small particles is significantly higher.
Also consider clean workstations rather than a clean room. If only one operation needs to be done in a clean environment a single workbench can be much cheaper.
Best regards,
Raye Rivera
QA Manager * Canoga Perkins * 818-678-3872 * [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Herminia Guevarra
Sent: Friday, May 10, 2013 6:44 AM
To: [log in to unmask]
Subject: Re: [TN] IPC Class 2 Clean room specification
Hello all,
Does anybody know the IPC spec for Class 2 clean room environment?
And what equipment is best to measure/monitor dust particle count?
Please reply. Thanks.
Herminia
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