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Reply To: | TechNet Mail Forum. |
Date: | Sun, 9 Nov 1997 21:02:12 -0500 |
Content-Type: | text/plain |
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Hillel,
Referring to IPC-6012, Par. 3.6.2.3. "Multiple voids between two adjacent
plated though holes in the same plane shall not have voids that same plane
shall not have combined length which exceeds those limits." For class 2 and
3, this is 0.003 inch. See also Par. 3.6.2.4 that states the same for cracks.
I am not sure that you can designate it resin-starved when you view
resin-starvation in a vertical microsection. The microsection may show up as
multiple tiny voids, a kind of foam, a cracking or nothing at all. Most
often this type of feature is seen in visual exanination, and IPC-A-600 has
some good pictures of this. IPC-6012 says to go to IPC-A-600 for some of
those defect visually seen in the board, such as crazing, measling etc.
Phil Hinton
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