Flight Recorder Durability

From:         Matt Bobrowsky <msb@cclink.gblt.inmet.com>
Organization: Intermetrics, Inc.
Date:         27 Dec 95 21:43:52 
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Sorry if this is a FAQ, but can someone tell me what the
housing of the orange flight recorder is made out of?  I'm
wondering what's supposed to make it so much more durable
than the rest of the plane.