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Cleaning Zinc Discs
By Nigel Perry

What Is Harpic?

I may be quite wrong, but I thought that Harpic powder was mostly
caustic soda.  Sodium hydroxide in other words, or lye in the U.S.
Readily available as a drain cleaner everywhere.  Needless to say, very
dangerous stuff if not used correctly.  Powder into cold water, never
the other way around.

See http://ptcl.chem.ox.ac.uk/MSDS/SO/sodium_hydroxide.html
Also http://www.wisegeek.com/what-is-lye.htm

Take care!
Nigel Perry


(Message sent Fri 6 Oct 2006, 07:12:13 GMT, from time zone GMT+0200.)

Key Words in Subject:  Cleaning, Discs, Zinc

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