Technetters

I am in agreement with Dave that the greatest cause of board bow and twist is
board design.

Also if you look in IPC-6012 Para. 3.4.4, you will note that the flatness
requirement for all Classes is 0.75% max. for surface mount and 1.5% max. for
through-hole.

The design specification, IPC-2221 series, has the same numbers and this spec.
which replaces IPC-D-275 will be issued in the near furture

Phil Hinton

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