John,

1 ppm/C = 0.000001 in/in/C = 0.000001 mm/mm/C

If you're going to spec. the laminate CTE make sure you also specify the
required temperature range. My experience with flex circuit materials is
that the standard deviation of CTE measurements for any given sample is
large. Specifying CTE could be practically meaningless, so make sure you
work out the procedure with your suppliers, and do a measurement
capability study first.

Andy Magee
Unemployed Flex Guru
[log in to unmask]
(937) 435-3629

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