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April 2004

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TechNet <[log in to unmask]>
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"TechNet E-Mail Forum." <[log in to unmask]>, "Bloomquist, Ken" <[log in to unmask]>
Date:
Wed, 7 Apr 2004 10:33:47 +0300
Reply-To:
"TechNet E-Mail Forum." <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Subject:
Re: Bromide
From:
Brian Ellis <[log in to unmask]>
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text/plain (43 lines) 
Do you mean bromine or bromide? Bromide assumes an ionic bond to a
cation. You should have practically very little of this, assuming you
are not using HASL or a hydrobromide-activated flux. If you mean the
flame retardants in the substrate AND some components, then these are
not bromides but bromine which is covalently bonded to carbon. This may
sound like nit-picking, but it ain't. It is very important, chemically
speaking. Chemistry is a science, not an art form, and terminology is
very important in all science.

Brian

Bloomquist, Ken wrote:

> Good Afternoon Technetters,
>
> We have a customer that is asking for the amount of Bromide in our assemblies. Is there a rule of thumb for the amount of Bromide in FR4, generically speaking?
>
> Thanks,
>
> KennyB
>
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