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January 1999

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Subject:
From:
Burkhard Heck <[log in to unmask]>
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Date:
Tue, 12 Jan 1999 18:23:03 +0100
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Standard base materials like FR4 contain a certain percentage of bromine. This
apparently helps for the dimensional stability of the printed circuits. In
addition, it makes the material flame-retardant, i.e it does not burn on itself
like G10.
However, in the case of an external fire, the brominated materials release toxic
gases. Therefore FR4 is not allowed according to some safety instructions. Since
recently, we are asked to avoid FR4 if possible.

Does anybody know of materials, which have the advantages of FR4, but do not
contain any halogens and therefore do not produce toxic gases in a fire?

Does anybody have addresses of (especially European) base material manufacturers
whom I could ask for advice?

Thanks

Burkhard W. HECK
CERN
EP Division
tel: +41 22 767 3185
fax: +41 22 767 3020
[log in to unmask]

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