# Density of insulating foam on ET

From: Matson, Robert (ROBERT.D.MATSON@saic.com)
Date: Sat Feb 08 2003 - 02:11:17 EST

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```Hi All,

At work I had a link that gave the density of the spray-on
foam used to coat the external tank; unfortunately at home,
I cannot find it on the web.  What I *do* remember was that
it said the density of the foam was greater than that of
styrofoam.  I think it said a factor of 5, which seems
awfully high.

A quick search on line indicates that the density of styrofoam
is 30 kg per cubic meter. (I'm sure the figure varies quite a
bit depending on what type of styrofoam you're talking about).
Assuming the 6" x 16" x 20" dimensions given describe a
rectangular block, the corresponding volume is 1.11 cubic
feet which is 0.0315 cubic meters.  Styrofoam of this volume
would then weigh 0.944 kilos, or 2.11 lbs, which is not that
different (~25 %) from the 2.67-lb figure they've been
reporting.

But if the true density is indeed 5 times that of styrofoam,
then the actual mass of the debris would be 10 1/2 lbs --
that's getting to be quite significant.  Can anyone dig up
the density figure for the foam?  --Rob

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