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I've added an image of an open cell foam and a mention of closed cell foams - as they're also quite a widespread material. This does not sit easily in the structure of the 'foams' page, where metal foams are currently listed as a subset of open cell foams - maybe worth rearranging.
The Defining Characteristic
"The defining characteristic of metal foams is a very high porosity: typically 75-95% of the volume consists of void spaces." I was thinking that the defining characteristic would be: "Being made out of metal, and also a foam". —Preceding unsigned comment added by 18.104.22.168 (talk) 09:50, 21 April 2011 (UTC)
Aluminum foams and the Oklo reactor
the article says: "naturally formed Aluminum foams have been found in the Oklo reactor... " This information seems incorect. Aluminum is highly unstable in geological formation, and never found in metallic form. This looks like somebody wanted to make a joke... —Preceding unsigned comment added by 22.214.171.124 (talk) 05:18, 10 December 2007 (UTC)
Latticed metal foam?
I recall reading about former-Soviet classified technologies entering the workplace, one of them was described as a technique to foam metal with the bubbles forming a perfect grid structure for extremely high structural strength ... urban legend?