Bev very nicely outlines the test methods for each of the constituents of the circuit board (bare).
The other approach is to accumulate certifications from the suppliers of the constituent parts - the laminate, the foil copper, the mask, the surface finish, and finally from the fab shop that plated the copper. IPC 1752 gives a format for accumulating constituent component data. The 1752 approach is more practical when certifying an assembled board, and probably will be more reasonable when customers ask for certification to REACh, as that lists more and more substances that are restricted. Who knows where the blending of RoHS and REACh will end up.
Denny Fritz
SAIC, Inc
-----Original Message-----
From: Bev Christian <[log in to unmask]>
To: TechNet <[log in to unmask]>
Sent: Fri, Sep 17, 2010 8:31 am
Subject: Re: [TN] 'certification' to RoHS
Louis,
ot sure what your definition of certified is, but a circuit board consists of:
poxy
opper
lass fibers
older mask
urface finish (and possibly intermediate layer diffusion control metal layer)
So, does the epoxy consist of one of the two banned families of brominated fire
etardants (BFRs)? Unlikely.
s the copper contaminated with mercury or lead or cadmium? Unlikely. I
resume you are not making electronics for the US NAVY where an old contract
ight call for cadmium in some instances because of its anti-corrosion
haracteristics.
re the glass fibers going to be contaminated with
Mercury - unlikely
Cadmium - unlikely
Cr(VI) - unlikely
Lead - possibly, but it would be exempt anyway
Solder mask - of all the RoHS substances the BRFs would be the most likely, but
xtremely unlikely.
Surface finish - not in iSn, iAg, ENIG, ENERPIG, OSP, but it that REALLY lead
ree HASL you received? :)
So use XRF and look for Cd, Hg, Pb, Cr and Br. The latter is the one that will
ost you the most to test for, IF you are buying FR4, since a hefty portion of
he total weight of the board comes from tetrabromobisphenol A (NOT restricted -
et). If you have halogen free boards, then you shouldn't find any.
Bev
IM
----Original Message-----
rom: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
ent: Friday, September 17, 2010 8:15 AM
o: [log in to unmask]
ubject: [TN] 'certification' to RoHS
Technetters, I've noticed many discussions of RoHS and compliance on this forum
ver the years. A question came up here yesterday, an answer to which I
olunteered to attempt to obtain.
Is it possible to certify an unpopulated printed circuit board as RoHS
ompliant? My understanding is that a board's constituent materials, as they
ome from a supplier, can be so certified.
Louis Hart
ompunetics
onroeville, PA
SA
[log in to unmask]<mailto:[log in to unmask]>
12-858-1272
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