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To: techdiver@opal.com
Subject: Viton (registered trademark)
From: Peter R David <david@la*.st*.ed*>
Date: Tue, 20 Dec 1994 10:16:17 -0800 (PST)

The following information is from the Merck Manual, a book I recommend
highly to the chemically curious;

"Viton copolymers; Copolymers of vinylidene fluride and
hexafluoropropylene.  Used as synthetic rubbers that withstand a temperature 
of 200F in contact with most oils, chemical solvents, and fuels, have
good mechanical properties, resistance to ozone, oxygen and
weathering."

	Most types of 'natural' rubber are susceptible to failure
induced by heat, most oils, chemical solvents, and fuels, have good
mechanical properties, resistance to ozone, oxygen and weathering.  Hence,
the common usage of viton in extreme situations.  The downside is it is 
rather expensive.

	All the best,

		Peter David

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