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IPC Questions........

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#43655

IPC Questions........ | 29 August, 2006

Help, I have a customer asking if our shop conforms to IPC-a-610 class 2 specs. He is asking if our Humidity is kept under 40% and if we have a particle count under 5MG......where can I find info in the IPC spec on humidty and particle count in the air? Help please, thanks.

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#43660

IPC Questions........ | 30 August, 2006

When your customer talks: * Humidity is kept under 40% * Particle count under 5MG

He / she is not talking IPC-A-610, Class 2 requirements. He / she is talking about addditional requirements. * Humidity: ANSI-J-STD-001 => 18-30*C, 30-70%RH * Particle count: ** Institute of Environmental Science and Technology (IEST) sets up the criteria and measurement methods to determine cleanroom class [eg, 10, 100, 1000, etc]. Consult their web site and perhaps take one of their courses. ** Technology subcommittee of the IPC Suppliers Council has been trying to gather data on required cleanliness for various board fab operations - lay-up of innerlayers for lamination, phototoool generation, resist exposure, laser direct imaging, etc. Many shops use clean rooms, or clean areas, but there is little yield data for the fab steps with and without clean atmospheres. [D Fritz]

We talked about something similar to this [particle count] not too long ago on SMTnet. Search on => witness plate

There's no shortage of smart customers, eh?

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#43668

IPC Questions........ | 30 August, 2006

Dave,

Thank you for the info.....

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#43693

IPC Questions........ | 31 August, 2006

Is it possible that he was testing you to see if you knew whether or not 610 addressed environmental specs?

I had a consultant that was touring our plant ask me what aspect ratio we used on our stencils. I told him I like to keep it at 1.5 if I can. As it turned out our new VP of operations (pal of the consultant) was standing around the corner listening to see if I was worthy.

Some people are smart, some are not. Either way, if they're sleazy they're trouble.

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