It depends on the time your PWA inside the cleanroom too. If say average of 15 min. exposure time of the class cleanroom 10K, you might not have that much problem. If you let the PWA sitting on the floor for extended time without protection - long weekend for example, you might deal with different surface on the board (not easy to apply coating for example). It all depends what is process before and after... Not just the cleanroom class that matters. (shorter time the better... if you can control all your PWA within 1 hr throughput, you can get away a reasonable 10K room for many things - not all the 10K room are construct the same - how the duck lead to and where is connected on the top/air flow direction, how many sticky mat you have on the floor and shoes your staff wear... all counts... that effect particle count would not tell you).
Joyce Koo
Researcher
Materials Interconnect Lab
Office: (519) 888-7465 79945
BlackBerry: (226) 220-4760
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rivera, Raye
Sent: Friday, May 10, 2013 1:02 PM
To: [log in to unmask]
Subject: Re: [TN] IPC Class 2 Clean room specification
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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