The resulting material has a density of 0.9 milligrams per cubic centimetre.
By comparison the density of silica aerogels - the world's lightest solid materials - is only as low as 1.0mg per cubic cm.
To study the strength of the metallic micro-lattices the team compressed them until they were half as thick.
After removing the load the substance recovered 98% of its original height and resumed its original shape.
The first time the stress test was carried out and repeated the material became less stiff and strong, but the team says that further compressions made very little difference.
"Materials actually get stronger as the dimensions are reduced to the nanoscale," said team member Lorenzo Valdevit.
"Combine this with the possibility of tailoring the architecture of the micro-lattice and you have a unique cellular material."
The engineers suggest practical uses for the substance include thermal insulation, battery electrodes and products that need to dampen sound, vibration and shock energy.
Link thanks to andrewducker.
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