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Subject:	Re: PCB fab chemical question
From:	Brian Ellis <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 22 Jun 2000 10:54:47 +0300
Content-Type:	text/plain
Parts/Attachments:	text/plain (52 lines)

Jerry

No PCBs are used in PCBs :-) However, in FR-4 substrate, a small quantity of some
tetrabromobisphenol compound is mixed in with the bisphenol A in the prepolymerisation
stage, to render the stuff flame retardant. This tends to render the eco-freaks berserk
because they cannot see that there is an environmental advantage in preventing fires
from propagating, saving millions a year in fire damage, not to mention loss of life.

Brian

Jerry Hartman wrote:

> Anyone know if any of these chemicals are used in the manufacture of
> printed circuit board fabs?
> [log in to unmask]
>
> Polychlorinated Bipenyls (PCBs) or any products from this list:
>
> Polychlorinated Biphenyls
> Polychlorinated Terphenyls
> Monomethyl - Dibromo - Diphenyl Methane
> Monomethyl - Dichloro - Diphenyl Methane
> Monomethyl - Tetrachloro - Diphenyl Methane
>
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