Brian,
We have a project here in Massachusetts run by the Toxics Use Reduction
Institute on wire and cable and I can reply with certaintly that lead is
both used as a heat stabilizer and as a colorant in wire and cable products.
The heat stabilizers are found only in PVC but the colorants can be used in
any wire and cable resin system.
The industry is undergoing a rapid shift away from lead heat stabilizers
and lead pigments (mostly lead chromates) for products covered by the ROHS
and WEEE. There has been far less substitution for domestic non
electrical or automotive markets however such as in building wire. For
more information, see the TURI website:
www.turi.org/business/wire_and_cable.htm
Tim Greiner
Greiner Environmental, Inc.
At 04:29 AM 5/7/04, you wrote:
>I'm starting this as a new thread so as not to mix up several subjects
>in a single one.
>
>The case cited by others of the guy who chewed PVC insulation reveals
>that chrome yellow, a common pigment for paints in yesteryear, has been
>used for colouring plastics. It is doubly targeted in RoHS, because of
>the hexavalent chromium, as well as the lead.
>
>Can we be sure that, even today, chrome yellow is not used as a pigment
>for electronics components and wire. I have in front of me, as I write
>this, a dismantled chopper power supply unit. The earth (ground) wire,
>soldered to the PCB, is striped yellow/green. I see five capacitors that
>have yellow cases, of a colour very reminiscent of chrome yellow. The
>paper-based substrate, presumably epoxy, is yellower than I would expect
>of a natural epoxy colour. One of the ferrite-cored inductors is
>impregnated in a yellow resin.
>
>Is chrome yellow still used today as a pigment for electronics
>components/wires/resins? If so, has this been considered in the move
>towards lead-free/chromate-free?
>
>Brian
>
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