I'm not familiar with the molecular chemistry of polyimides, but your
hypothesis does not seem very likely. At least with epoxies and
polycarbomates, and I assume similarly with other resins, the brominated
flame-retardency compounds are not added particles but form an integral
chemical part of the resin structure, cross-linked into it.

Brian

Prasad Godavarti wrote:
> Dear Friends:
>
> we have an interseting situation: we ordered printed wiring boards that wre
> made from an Isola p96 laminate and the coupons microsections are showing
> what appears to be voids. I understand that these could be brominated
> particles that are added to the polyimide resin to make it fire-retardant.
> How would we verify this? does anyone else have any stories to share on
> what they have seen? I am told this is a finding that may be true only for
> Isola's P96 product that hit the market late last year or early this year?
> need any words of wisdom we can get.
>
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