Denis,

You will find achievable aspect ratios for rigid boards in Table 9-4,
IPC-2222, page 20.

This forum has already defined aspect ratio for you. However, I would like to
present a hint at finding things within the IPC-2221/2222. The IPC-2221
provides information that is generic to a number of board types from rigid to
descrete wire. For tables specific to a technology, you will have to refer to
the sectional standard for that technology. In your case you needed to look
in the IPC-2222 for Rigid Organic Boards. The committees attempted to
maintain topic paragraph numbers between both specifications. As an example,
section 9 in both specifications would have something on aspect ratio.

Regards,

Gary

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