[pianotech] Lead contamination abatement protocol

[paul bruesch]

Interesting. Isn't it the zinc used in the alloy for the Young Chang action
brackets that caused the expansion issue? I've heard (and I hope I'm not
propagating an inaccuracy) that the alloy was allowed to cool overnight,
reheated, cooled, rinse and repeat and that was what caused the expansion.
So I guess if you're going to alloy zinc with your lead, don't mix up more
than you'll use in one sitting. Confirmation? Rebuttal? Chemists?

Paul Bruesch
Stillwater, MN

On Fri, Mar 25, 2011 at 6:08 PM, Kerry Cooper <brispiano at optusnet.com.au>wrote:

>  To coat the lead weights, I have been using shellac since my days as an
> apprentice in 1963. This works well as a sealant as player techs would
> know.
>
> If the lead has started to oxidize, then it will grow and will need
> replacing in the future. There has been discussion here in Oz about why  in
>
> some pianos lead grows and others in the same room do not. When I was an
> apprentice, i was told to add zinc to the molten lead to stop or slow down
> this oxidization process.
>
> Hope this helps.
>
> Kerry Cooper ARPT
> Brisbane, Australia
>
> --------------------------------------------------
> From: "Andrew Anderson" <anrebe at gmail.com>
> Sent: Friday, March 25, 2011 10:08 PM
> To: <pianotech at ptg.org>
> Subject: Re: [pianotech] Lead contamination abatement protocol
>
> >
> > I'm not sure what I can seal the weights themselves with, but will  look
> > for a primer and cut a little hole out of the bottom of a plastic  cup
> and
> > spray into the cup over the keyleads (after preparing with a  little
> > sanding).
> >
> > There is room between the leads and the side of the key, so they have
> not
> > expanded yet...  Sealing might slow the process, but I will  recommend
> > eventual replacement.
> >
> > If anyone has more to add, please do so.
> >
> > Thanks,
> > Andrew Anderson
> > On Mar 23, 2011, at 8:12 PM, Leslie Bartlett wrote:
> >
> >> When does one go "too far" with this stuff.   I'm old, and spent my
> life
> >> messing with stuff that now I think will kill if you're within a
> >> thousand
> >> miles- and the worst they've done to me is a bad heart valve- which
> >> might
> >> have been because my mother was exposed to something toxic when she  was
>
> >> a
> >> kid.   I'm not trying to be too flip, but when I see anti bacterial
> >> stuff at
> >> the grocery door, and realize I'm one of the "bad people" who don't  use
>
> >> such
> >> stuff, it just seems a little much.
> >> Les Bartlett
> >>
> >> -----Original Message-----
> >> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]  On
> >> Behalf
> >> Of Andrew Anderson
> >> Sent: Tuesday, March 22, 2011 3:09 PM
> >>
> >> The subject is a Wurlitzer from Korea.  Silver dust under the weights
> >> in the keys on the keybed and keyframe.  Leads are not protruding out
> >> of the key (yet).
> >>
> >> Do you moist wipe off the loose stuff, bag the towels, and than seal
> >> the lead from the air with some sort of paint/sealer?
> >>
> >> Is replacement necessary?
> >>
> >> Ideas?
> >>
> >> Andrew Anderson
>
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