melting plastic SOT

[Mark Cramer]

Dorrie,

thanks for your informative reponse to Wim's question. What a resource you
bring to our list!

While I have your ear (so to speak), I wonder if you've contemplated the
mysteries of the many chemicals we use to deal with fricton?

Please do not feel obliged, but if you're willing/interested, here are a few
questions:

1.) I've been told that Protek CLP is a (high-tech) polymer, and I remember
someone drawing link diagrams in vain attempts to register a definition of
"polymer" I would understand. Specifically, I would like to know if/why the
properties of CLP are considered so safe/neutral in application to cloth
parts?

2.) Can you describe (conjecture/verify) the nature/properties of cloth once
treated with CLP?

3.) Why should we not consider this an "oily" (as in felt-contaminating,
dirt-attracting) product?

3.) How would the properties of Mc Lube 444LS (teflon-type liquid) compare
to Protek?

4.) We have many metal/felt contacts within the action, i.e.: capstan to
heel-cloth, key-pin to bushing cloth, spoon to damper-lever cloth, etc.
Although products such as CLP and McLube are recommended for treating both
cloth and metal, is it wise to treat "interacting" parts, such as both the
bushing cloth and the key-pin?

5.) What about treating the metal part with CLP/McLube and the cloth part
with Teflon powder?

Gee, do I ever have alot of questions!

Thanks for your help Dorrie, if you wish, and welcome to the list!

Mark Cramer,
Brandon University



-----Original Message-----
From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]On Behalf Of
dabell58@earthlink.net
Sent: Sunday, April 27, 2003 6:57 PM
To: caut@ptg.org
Subject: RE: melting plastic SOT


Dear Wim and all,

  Probably the easiest way to understand the question is to recall that
there are many kinds of plastics, and they don't all behave the same way.

  Here's more detail: Keytops are basically acrylic, which is a plastic
formulation containing carbon, hydrogen, and oxygen. The oxygen molecule is
very attractive to electrons (negative charges), and the resulting plastic
has its electrical charges unevenly distributed, more electrons near the
oxygen molecules.

  High-density polyethylene (recycling label #2) is used to make chemical
storage bottles. HDPE is made up only of carbon and hydrogen and has its
electrical charges evenly distributed over its whole area.

  Acetone, because it is made up of carbon, hydrogen, and oxygen, has
uneven distribution of its electrical charges. It readily dissolves (mixes
with) other unevenly charged compounds, such as acrylics (keytops) but is
repelled by and does not mix with evenly charged compounds, such as HDPE
(container bottles).

  That's the story.

  Best wishes,

  Dorrie Bell   Ph.D., Physical-Organic Chemistry, Brandeis University
  Associate Member, PTG




Original Message:
-----------------
From:  Wimblees@aol.com
Date: Fri, 25 Apr 2003 12:08:10 EDT
To: Pianotech@PTG.org, caut@ptg.org
Subject: melting plastic SOT


Melting Plastic, SOT, (Slightly Off Topic.)

For hammer juice, I use acetone and keytops. I keep this solution in a
plastic bottle.

I'm no chemist, so how come the acetone dissolves the plastic keytops, but
doesn't  dissolve the plastic bottle in which it is kept?

Wim

PS. Before I get blasted for using this stuff in the first place. please be
assured I use it very sparingly only on Steinway hammers when I voice.
These
Steinway hammers are first given a liberal dose of lacquer and lacquer
thinner, as per factory specification. I don't use any kind of juice on
other
hammers. (I keep the lacquer mixture in a plastic bottle too, (a mustard
bottle), and it doesn't dissolve either.)


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