Message-ID: <014301c010a3$18704b20$f838de9e@computer>
From: "Colwell" <colwell@innercite.com>
To: <lancair.list@olsusa.com>
Subject: Re: Methylene Chloride or Acetone?
Date: Sun, 27 Aug 2000 20:50:23 -0700
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

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>>
I posted the following message some time ago, thought it might be worth
revisiting.
MC can be hazardous but so can delaminations.  I advise good Poly Vinyl
Alcohol
gloves, ventilation and MC.
Some possible 1 to 5gal. suppliers in Houston to try are at: 713 937-9300,
281 485-5377,
512 416-9640, 281 351-6828, 713 466-8776, 713 472-7887.  Some of these are
under Solvents in the Yellow Pages and some are Scientific, Electronic
Suppliers who also
handle MC in small quantities.

>>
Having worked for the petrochemical div of a oil co many moons ago I learned
a few things.

Methylene Chloride is a strong solvent for oils and waxes.  It is strong
enough to attack foam and some resins if used in sufficient quantity to
accumulate rather than flash off.  This stuff IS toxic and should be used
with gloves & ventilation (I use my shopvac mounted outdoors to assist).  It
is by far the best cleaner for our purposes. Nonflammable

Acetone is a good solvent for waxes and very poor for oils.  Less toxic than
MC and Highly Flammable.  Which brings me to the pressurized misting of
Acetone, I advise against it.  Much higher vapor pressure than gasoline and
its the vapor that burns/explodes kids.

If you want to test any cleaner take a piece of plate glass and wash it with
dishwashing soap.  Then smear on oil off your face and nose at the end of
the day, add some car paste wax next to it and some motor oil.  Wipe with a
paper towel dampened with the cleaning solvent and hold it up to a light.
MC does a good job, Acetone will just move the oil around.

While I am holding forth on cleaners, the best way to clean is to hold a
damp (not dripping) folded piece of paper towel in one hand and a dry piece
in the other.  Wipe one pass only with each side of the towels closely
following the damp with the dry to avoid the flash off drying of the
cleaner.  Turn the towel pieces to a fresh side and make ONE PASS.  Give the
parts plenty of time to dry or use your heat gun to accelerate the process
particularly on prepreg honeycomb or suffer fisheye.    Steve Colwell


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Please send your photos and drawings to marvkaye@olsusa.com.
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