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Below is a response from the Boeing Co. re: the "spheres" alluded to in the (FBI report from Brookhaven National Labs, 1997) and just recently declassified. (note one sentence in the below transmission was a little skewed, however, that is the way it was received)
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Thanks for your inquiry [name redacted]
I am unaware of anything on a Boeing commercial airplane that would use those chemicals in a matrix (or other form.)
We do not use Aluminium /Titanium matrix type metals since their differing thermal expansion rates will tend to tear a part fabricated from them apart when subjected to the rapid change in temperatures that jet aircraft encounter.
We use a temperature differential of +180 degree F to -70 degrees F in 20 minutes as a design criteria. The +180 was a measured skin temperature of an airplane sitting in the sun in Saudi Arabia. Also, we try to limit the amount of Titanium we put into the airplanes because it costs so much. We use it where strength and fatigue requirements make Aluminium inappropriate.
Hope this helps.
Thanks,
(redacted)
Associate Technical Fellow
Service Engineering
The Boeing Company