Maninno/Kawai/ABS-oxidation

Richard Brekne richardb@c2i.net
Wed, 23 Jun 1999 15:28:23 +0200



Billbrpt@AOL.COM wrote:

> Thanks Zy for your contribution.  I have noticed that among the spinet pianos
> that have the plastic elbows, that the ones that had the weakest, most
> brittle parts were the ones that had an uncontrolled Dampp-Chaser
> dehumidifier rod.  I have often suspected that the heat from the rod
> contributed to the degredation of the material but not being a chemist, I had
> no way of proving or even researching that idea.
>
> Any ideas on this anyone?  I once replaced the elbows of a Betsy Ross Spinet
> (one of my favorite little pianos) with the dehumidifier blazing away in
> Winter where the elbows crumbled as easily as the Christmas candy that I was
> offered while doing the job.  I needed no tools to remove the elbows or even
> the remnants, I could break out the material with my fingers alone.
>
> Bill Bremmer RPT
> Madison, Wisconsin

Makes sense about the heat from the humidifier. I often see plastic crumbling
very early on in a pianos life in homes where lots of dry heat is used in the
winter. Sometimes Schools who nortoriously insist on placing a piano with its
back right up against an electric panel oven also have this problem.

Personally I almost always replace plastice parts with wood ones whenever the
situation comes up. I am definatly not sold on plastic, not yet anyways. Wood
works great, what can I say.

Richard Brekne
I.C.P.T.G.    N.P.T.F.




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