Standard stuff is a flexible plastic with powdered ferrite to match air, but
attenuate for no reflection, usually too heavy.
Stealth I think used a carbon material that matched air but had loss, also
in little hex patterns to keep the number of reflections high, more loss.
But they would not let us get that close to it 10 foot.
--Dwezil Smith

"Frank Alforo" wrote in message
...
Anybody have any info the material used on the stealth aircraft to absorb
radar signals?